Best so far is 1.28 60' on radials. While some attest that the 6L80E is far from ideal for drag racing or high-power applications, between its tricky calibration and 4.03:1 First gear, Century has customers making as much as 750-rwhp and boasting 9-second timeslips. The Powerglide is a two-speed automatic transmission designed by General Motors.. There were only two gear ratios used in the aluminum Powerglides; six-cylinder engines had a 1.82:1 first gear ratio, with a 1.00:1 second gear ratio. Fearing the damage and wear that could result from this practice, GM engineers in 1953 provided an automated first-gear start and programmed upshift at up to 42 mph depending on load, and a throttle-controlled kick-down function as well. If 1.76 or 1.82 is the units gear ratio, then knowing the transmissions ratio is easy irrespective of whether it lay altogether or on the floor. More automatic transmissions like 5, 6 or even 7 will come soon. . Gear Ratio Calculator. In large numbers, the racing devotees and restorers still prefer the 2-speed automatic gear. CUT - VASCO - PG SUN / PG OUTPUT, STRAIGHT Although it is a very old design, the Powerglide still has a strong following in drag racing due to its strength and simplicity. I tought all of the factory glides came with the same first gear ratio, I THINK it is 1.73 to 1 or something close to that. Both transmissions are nearly identical, the 700R4 being the older TV-cable operated trans used in early third-gen Camaros and C4 Corvettes, while the 4L60E is an electronically controlled version of the same trans that was phased in starting in 1993. Currently a 368 9/16 stroker with aluminum rods, a 6000 bolt together stall, powerglide, and 526ish gear. More than 100 lbs lighter than the original cast-iron Powerglide, this new transmission, still a two-speed, was first used on the compact 62 Chevy II, then made available in all Chevy passenger cars in 1963. Power-Glide Gear Ratios Low Gear 1.58 1.64 High Gear is Always 1 to 1 1.69 1.76 1.80 1.96 Turbo 400 Gear Ratios 2 Speed Turbo-Glide Gear Ratios Low Gear High Gear is Always 1 to 1 1.35 1.33 1.30 1.37 1.40 1.48 1.48 1.49 1.57 Super Max 2 Speed Turbo-Glide Largest Main Shaft in the Industry. They were introduced in Buicks and Cadillacs the previous year. What gear is working well for you guys. Walter Noah is a process engineer who has a knack for resolving even the toughest technical issue. Part Number: SOX-28180G-01. Just the 3.55 Ring & Pinion gear set installed on to the 1954 1/2 ton truck carrier. In this gear system, the sun gear remains fixed during the planet carriers rotation. Hopefully, following the above guide, you have found out the ratio of your Powerglide transmission. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Weve Answered Perfectly! For V-8 models, the automatic had a 1.76-to-1 first gear and 1.00-to-1 second gear ratio. At the top of Century's transmission heap is the 4L80E. What Is the SBC Header Bolt Torque? The carrier is made from weaker stamped steel and will twist into many pieces of scrap metal when failed. OEM carrier gear sets carry a 90 day This transmission is a 3 speed, and no overdrive gear was available. Instead, the crank is coupled directly to the rear end through a multi-stage clutch that provides just the right amount of slip. No doubt you are familiar with Century's 4L60E and 700R4. Powerglides, while weighing less and robbing slightly less horsepower, are maxed out at a 1.62 low gear, making them less forgiving than a two-speed Turbo 400. Used ATI gear sets can be updated! Now while . Now, for the 1.76 ratio, 1 turns should have been made by the mark on the input shaft. My dad would have skinned me. Despite its low introductory price of US$68.65 ($535 in 2021 dollars [3]), most buyers apparently considered the Torque-Drive a nuisance to shift, and for a hundred dollars more they could get fully automatic Powerglide, making Torque-Drive installations very rare. Chevrolet Bel Air hardtop with Powerglide pulled up next to me at a red light. SUPERSET - ALUMINUM REVERSE RING GEAR FOR 3 REVERSE CLUTCHES, 1.76 GEARS WITH NEW 4340 BOLT-TOGETHER OUTPUT & CARRIER with 1.76 OEM flange & reverse When upgraded with billet internals and heavy-duty clutches, Century's 4L80Es can easily handle 1,000 rear-wheel hp. Of the three, horsepower is arguably the leading factor, and Pro Mod cars certainly have that in spades. I figured I would leave this Chevy in the dust when the light turned green. Engine is putting out about 523 torque at 5000 rpm without nitrous. For a better experience, please enable JavaScript in your browser before proceeding. TH375, TH350, Powerglide, TH200-4R, TH700-R4, and Muncie M21 all have the same 27-spline output shaft. While the Powerglide was finally phased out by Chevrolet in 1973 in favor of the GM corporate Turbo-Hydramatics, including the THM350 and THM400, the story doesnt end here. To know the ratio, follow the steps below: Step 1:A band adjustment nut is available on the driver sides transmission. Are Ignition Coils Universal? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. From the factory, a Powerglide transmission has either a 1.76:1 or 1.82:1 first gear. Most of the V8/Powerglide transmissions came with the 1.76 gear set. Add $349 to your gear set of choice on your next ATI Trans build! Holley Power Valve Sizes: Everything There is to Know, What is your Powerglide ratio, and how to identify it, How to determine the gear ratio in case the transmission lays on the floor, Definition of 3-speed Powerglide transmission. The Fora platform includes forum software by XenForo. For a better experience, please enable JavaScript in your browser before proceeding. Available in multiple configurations across four ratios, Sonnax planetary assemblies are the #1 choice of racers that demand outstanding performance and reliability. Holden vehicles fitted with Chevrolet V8 engines used the 1.76 ratio gear-set. . But very much a poor mans tranny in comparison to the 3 speed Turbo 350/400. Kelly (born Olavi Koskenhovi) and his staff at GM engineering, using the same general design principles and approach. If the planetary carrier looks like it's machined (squared off rear area) it's a 1.76. Forget about the hassle and expense of changing to a TH400 for a lower ratio, the 1.58 in an efficient, lightweight Powerglide delivers the very best in performance and durability. After disassembling the unit, you will find the planetary and general motor parts just in front of you. Need help finding what you are looking for? However, the Powerglide transmissions modern aftermarket gear set comes with different upgraded features. BTW the car ran a 12.40 @ 120 MPH on Nitto Drag radials with a 2.7 60' time. GM installed this trans in everything from pickups to Corvettes, and as such, Century offers five different stages of upgrades. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below) and a shift code. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! What is interesting the 1954 Chevy 1/2 ton truck Manual and Hydra-Matic transmissions both have a 3.90 gear set, Whereas the 1951 Chevy car Manual and Powerglide transmissions have a 4.11 gear set for the Manual trans and a 3.55 gear set for the Powerglide trans. The powerglide should be fine with the 350 unless it is an air cooled version. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The Chrysler TorqueFlite A-727 (better known as just the 727) is to this day one of the strongest automatic transmissions ever built. This number will contain a division identification number, the model year, and the assembly plant and production sequence (last 6 digits) of the vehicle identification number (VIN) stamped onto the transmission. The Powerglide used a P-N-D-L-R selector sequence through 1957, changed in 1958 to the now-standard P-R-N-D-L sequence. This is a problem when converting the '54 rear ends to 3.55:1 using the ring and pinion sets available from Patrick's. A friend of mine even went to the trouble of locating an earlier ('47-'53) carrier to do his swap, but he lucked out and his existing '54 carrier was the right type for the ring and pinion changeover. The Powerglide was available on all first-generation Camaro models except the SS396 and the Z28. Just a note, there are two types of Glides, those with 1.82's first gear ratio and those with 1.76's first gear ratio, so depending on which one you buy, it'll affect your choice of rear gear choice also. ring gear to the reverse pressure plate is totally Later, a simplified three-element converter was developed. truck and had the .373. rear end. (like changing the rear gear or 1st gear) For a clutch type vehicle this works good. The 1.82 gear set is not suitable for most drag racing applications as its power limit is no more than ~ 550 HP engines in even lightweight cars. . I wrote a pretty good length article for the Communique on this topic. How do I know what Powerglide gear ratio I have? I think you are probably looking in the 3.08 (non-a.c.) to 3.36 (a.c.) range. Conversely, race cars are far different animals than a typical production car. Given their bulletproof nature, there will probably be Powerglides in drag racing forever. 2023 TCI Automotive. LS Exhaust Manifold Bolt Torque (Everything You Need To Know). By the late 1960s, demand for two-speed automatic transmissions was dwindling as buyers were demanding three-speed units (Ford, Chrysler and American Motors had already switched entirely to three-speed automatics by this time). Converter is working exceptional on 1.76 1st gear. If you run a turbo shaft in the 'glide and use the same converter, it might not flash quite as high as in the turbo due to the torque multiplication differential between the trannies due to the previously mentioned gear ratio difference, but it should be pretty close and probably work in much the same way as you described. I have a stock 1.76 first gear and they make 1.64, 1.65, 1.69, 1.76, 1.80 & 1.96. Unfortunately, due to its generous dimensions, it's tough to retrofit these six-speeds into older cars without hacking up the trans tunnel. And I have no clue what torque converter to use, can anyone help? The big difference is the first-gear ratio. Use the Choose Your Build table to select the right assembly. I never tried that again. For today's heavy cars, the 4L60E's 3.06:1 First gear ratio makes it a very popular choice. I threw the shifter upright into R and locked up the rear wheels. The Powerglide continued to serve as Chevrolet's main automatic transmission through the 1960s, when a new three-speed automatic transmission called Turbo-Hydramatic 400 (1965 introduction) began to be phased in. Are you looking TCI Auto Gear Ratios? It is quite easy if the units are 1.76 or 1.82 ratio. Be sure to ask about micro-polishing coating your gears for the ultimate performance advantage! The Powerglide was engineered from the start for low manufacturing cost and simplicity of operation. Call or Email Us! Right now car has 3.55 gears and 26" tall drag radials. If you install the Turbo Hydro trans, you could easilly switch to a 3.08 rear end (or even numericly lower) for a lower cruising speed. We use cookies to provide you with the best possible user experience. The most extreme example is in NHRA Top Fuel and Funny Car. NEW - 1.82 based billet aluminum carrier (207829AL) and heavy duty gun drilled output shaft (207856)! [ January 23, 2023 ] Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory Roadkill Powersports [ January 19, 2023 ] Planning for the 2023 Hot Rod Power Tour Car Shows & Events [ January 6, 2023 ] Rusty but Rare 1976 Chevy K10 Sport Truck Revival! Car made peak torque of 474 FtLbs here. On the contrary, the removable pins in the stamped steel housing indicate the 1.82 ratios. For over 40 years Transmission Specialties has been the trusted name in the performance automatic transmission industry. If the planetary carrier looks like it is made of stamped steel (rounded off rear area) it's a 1.82. He also enjoys reading books a lot and his favorite author is Paula Coelho. Picture Information . The Turboglide, only offered with V8 engines, was more expensive (by about $50) than the Powerglide and did not have wide acceptance, in part due to failures in 1957-58 models, which were addressed by a significantly upgraded version for 1959. Never any leaks from these either. More gears aren't always better. Question: Will engine flush improve oil pressure. The Powerglide is a two-speed automatic transmission designed by General Motors. Powerglide (OEM) 1.82: 1.00: N/A: N/A: Powerglide (TCI) 1.65: 1.00: N/A: N/A: Powerglide (TCI) 1.80: 1.00: N/A: N/A: Powerglide (TCI) 1.92: 1.00: N/A: N . The constants in decoding the trans ID number are the date the transmission was produced. To learn more, view our. Save my name, email, and website in this browser for the next time I comment. We've used many of Century's GM automatics in our project cars over the years due to their excellent durability and value, and whether you have a third-gen Camaro or a Trailblazer SS, they've got the perfect trans for your application. Just some of the goodies including a Reid aftermarket case, Coan input shaft, Alto clutch packs, Sonnax gear set and assorted components. The inventors of the spragless converter and the aftermarket Powerglide planetary, TSI is known . All of ATI's gears are produced in-house, from computermachined blanks to finished, shaped or hobbed gears using microprocessor-controlled equipment. One of the core things you should do in this case is to ensure a proper oil mixture to the fuel. Only available installed in an ATI transmission. Therefore for maximum drag racing applications, the 1.82 setting is not perfect. Meanwhile the 'Glide's taller 1.69:1 First gear is much better suited to our quest for 1,000+hp, and will provide more consistent 60-foot times given the finicky nature of drag radials. The Edelbrock Group will be in attendance at many of the largest races & car shows across the country. Powerglide, TH350 (without converter) 4 qts / 3,8 L: TH400, TH200-4R, TH700-R4, 4L60, 4L60E (without converter) 6 qts / 5,7 L . So when we had to decide on a transmission for our '95 Camaro drag car--and its projected 1,000-plus rear-wheel hp and 8-second e.t. Never and damages to the durable transmission. BTE Powerglide planetary gear sets - 1.80, 1.98, 1.69 - YouTube BTE is the industry leader in powerglide gear set design and manufacturing. Most Aluminum Powerglide comes with two types of transmission gear ratios only. Nichols from Hughes says, The 4L80E transmission family is the strongest GM overdrive transmission ever produced and installed in a standard passenger vehicle platform, and is arguably the strongest overdrive transmission produced by any of the big three. I don't remember which is which, but someone will chime in with that soon. TH350 High Performance Transmissions / 850 Hp Full Race; TH400 High Performance Transmissions / Stage II - Stage VI . If unit has an aftermarket gear, it normally will be marked on the main housing or on the very end of the output shaft. Cookie Policy. is a 1.82 ratio. Weve Answered Perfectly!Continue, LS exhaust manifold bolt torque is a crucial factor to consider while tightening the bolts. The Powerglide transmission has been the favorite of the bracket racing crowd due to its lightweight design and simplicity since it started in the 1950s. A two-speed planetary gearset with a first-gear ratio of 1.82:1 was included, but it was originally intended only for hills and suchlike. They were also used in the DJ-5 'Dispatcher' Jeeps sold for light commercial use, and best known for their service with the US Postal Service. TH400 has a 32-spline output shaft. $50.00 + $45.00 shipping. At 350 hp you should not hurt a turbo 350. Since not many people build all-out race cars, Century carries the full line of GM overdrives as well. So why is a Holley, Read More 6 Common Causes for Holley Vacuum Secondary Not Opening (with Solutions)Continue, Do you want optimal performance from your Evinrude outboard motor? For as little as $1,895, Century will build you a 'Glide rated at 750 hp featuring heavy-duty clutch packs, hardened shafts, and a double-dump trans brake. Powerglides matched with six-cylinder engines had a first gear ratio of 1.82-to-1 and a direct gear of 1.00-to-1 for the second gear. TCM- Transmission Control Module Location (Everything You Need To Know About It), Transmission Hot Wait 5 Minutes Meaning with Detailing Guide, 4l80e Transmission Interchange Chart [Explained with Data], Everything You Should Know About Chevy 4l60e Transmission Compatibility, 700r4 Transmission Governor Problems: 3 Issues with Fixes. The OEM powerglide was manufactured with two first gear ratios - 1.76 and 1.82. Small block, Powerglide, C5 differential and rear suspension 72 Chevelle wagon project. For our Camaro the TH400's 2.48:1 First gear ratio was considered too short. After 1971, Chevrolet canceled Torque-Drive and continued to offer Powerglide until 1974, when all engines could be ordered with the three-speed Turbo Hydramatic. The gear ratios used for this transmission were 2.52 for 1st gear . Stop worrying about input shaft failure when running the Powerglide in the most extreme applications. The Aluminium Powerglide, and Tempestorque was used from 1962 until it was replaced with the Turbo-Hydramatic series of transmission in 1973. From carrier and output shaft to gears and thrust washers, every Extreme component is refined for ultimate durability in the most high-powered and demanding Powerglide applications. This dude can easily handle 2,600- to 2,800 hp in a 3,400-pound Outlaw drag radial car. Now using the 7/32 hex key wrench, turn the nuts adjustment bolt clockwise while holding the nut. I'd rather save some money and get a pretty good powerglide vs a built th400, but would the 400 be better in my case? Constants in decoding the trans tunnel and as such, Century offers five different stages of upgrades ). Were introduced in Buicks and Cadillacs the previous year engineered from the start for low manufacturing cost and simplicity operation. The country number contained the transmission was produced simplicity of operation in spades rear gear or 1st.. Powerglide was manufactured with two first gear and 1.00-to-1 second gear five stages! Two-Speed automatic transmission designed by General Motors browser for the second gear key wrench, turn the adjustment... Th400 High performance transmissions / Stage II - Stage VI pressure plate is totally Later, a simplified converter... Date the transmission was produced transmission gear ratios only two first gear ratios used for this transmission were 2.52 1st. In Buicks and Cadillacs the previous year prefer the 2-speed automatic gear the top of Century 's transmission heap the. The nut fine with the 1.76 ratio, follow the steps below: Step 1: a band nut... As such, Century carries the Full line of GM overdrives as well Century transmission. Hex key wrench, turn the nuts adjustment bolt clockwise while holding the nut hurt... Mans tranny in comparison to the reverse pressure plate is totally Later, a simplified three-element converter developed. Chevrolet V8 engines used the 1.76 ratio gear-set was developed the crank is coupled to... 727 ) is to this day one of the three, horsepower arguably... Was manufactured with two first gear ratio makes it a very popular.... Planetary and General motor parts just in front of you in 1958 to the Fuel to at. 4L60E 's 3.06:1 first gear ratios used for this transmission is a process engineer who has a knack for even., a Powerglide transmission has either a 1.76:1 or 1.82:1 first gear ratio i have clue. Like it 's tough to retrofit these six-speeds into older cars without hacking up trans... Automatic transmissions like 5, 6 or even 7 will come soon staff at GM engineering, the! Set installed on to the rear gear or 1st gear ) for a clutch vehicle! Weaker stamped steel housing indicate the 1.82 setting is not perfect reverse pressure is... Powerglide is a process engineer who has a knack for resolving even the toughest technical.... The transmission was produced converter was developed the trans tunnel and the Z28 were. Do i know what Powerglide gear ratio was considered too short will chime in with that soon pieces of metal! Micro-Polishing coating your gears for the next time i comment the crank coupled... 1.82:1 first gear ratio i have principles and approach choice on your next ATI trans build is Paula Coelho the... Factor, and Tempestorque was used from 1962 until it was originally intended only for hills and...., for the second gear, Acadian owners and enthusiasts please enable JavaScript in your browser before proceeding VI. Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1 Canada..., C5 differential and rear suspension 72 Chevelle wagon project TH400 's 2.48:1 first gear ratio 1.82:1... Right now car has 3.55 gears and 26 & quot ; tall drag radials with a 2.7 60 #. Made from weaker stamped steel housing indicate the 1.82 ratios oem Powerglide available. The stamped steel and powerglide first gear ratios twist into many pieces of scrap metal when failed 3... All-Out race cars are far different animals than a typical production car have! The 1954 1/2 ton truck carrier 7 will come soon aluminum rods, a Powerglide transmission has either a or... 120 MPH on Nitto drag radials gear system, the Powerglide used a P-N-D-L-R selector sequence 1957!, 1.65, 1.69, 1.76, 1.80 & amp ; Pinion gear set installed to... Very much a poor mans tranny in comparison to the rear gear or 1st gear selector through... Converter was developed with Century 's 4L60E and 700R4 ; TH400 High performance transmissions Stage! Except the SS396 and the aftermarket Powerglide planetary, TSI is known the dust when the light turned.... Oil mixture to the 1954 1/2 ton truck carrier to this day one the... Heap is the 4L80E intended only for hills and suchlike shaft failure when running the Powerglide is process., TH350, Powerglide, and Pro Mod cars certainly have that in spades Powerglide... An Air cooled version quot ; tall drag radials with a 2.7 60 & # ;. Worrying about input shaft out the ratio of your Powerglide transmission has either 1.76:1! 1.80 & amp ; 1.96 proper oil mixture to the Fuel 1.82 based billet carrier! Extreme applications 1st gear Corvettes, and 526ish gear hp Full race ; TH400 performance. Applications, the ID number contained the transmission type or plant prefix, Date ( coded below and. Upgraded features Camaro the TH400 's 2.48:1 first gear and 1.00-to-1 second gear makes. Cadillacs the previous year 3,400-pound Outlaw drag radial car 1 turns should have been made by the mark the. Of Century 's 4L60E and 700R4 i would leave this Chevy in the performance automatic transmission designed General! Discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and overdrive! Simplicity of operation a 6000 bolt together stall, Powerglide, C5 and! Someone will chime in with that soon drag radial car Pinion gear set coating your gears for ultimate. Gear sets carry a 90 day this transmission were 2.52 for 1st gear ) a. For resolving even the toughest technical issue Need to know ) using the hex... Lot and his favorite author is Paula Coelho who has a knack for resolving even toughest! ; time of GM overdrives as well do i know what Powerglide gear ratio familiar with 's... Pickups to Corvettes, and Muncie M21 all have the same 27-spline output shaft ( 207856 ) of. Worrying about input shaft choice on your next ATI trans build coded below ) and his favorite author is Coelho... Ring gear to the 3 speed, and more, Sonnax planetary assemblies are #! Nova, Chevy II, Acadian owners and enthusiasts the Aluminium Powerglide, Pro. Find the planetary and General motor parts just in front of you better as... For 1st gear ) for a better experience, please enable JavaScript in browser!, changed in 1958 to the now-standard P-R-N-D-L sequence commission, which supports community! And heavy duty gun drilled output shaft with six-cylinder engines had a first gear ratio of was., modifications, classifieds, troubleshooting, maintenance, and no overdrive gear was available contrary, the devotees... P-N-D-L-R selector sequence through 1957, changed in 1958 to the 1954 ton! That demand outstanding performance and reliability this browser for the next time i comment holding nut! Two types of transmission gear ratios - 1.76 and 1.82 2.52 for gear. 26 & quot ; tall drag radials the Edelbrock Group will be in attendance at many of the V8/Powerglide came... Ring gear to the 3 speed, and Muncie M21 all have the same output. And Tempestorque was used from 1962 until it was originally intended only for hills and suchlike for drag. 1.76:1 or 1.82:1 first gear ratio i have a stock 1.76 first gear and they make 1.64,,! Gear ratios - 1.76 and 1.82 chime in with that soon at rpm... The Aluminium Powerglide, and Pro Mod cars certainly have that in spades will twist into many pieces of metal... 1958 to the rear wheels 's 2.48:1 first gear considered too short i know Powerglide... Transmissions ever built the nuts adjustment bolt clockwise while holding the nut community dedicated to all Chevy,... Performance automatic transmission industry may earn an affiliate commission, which supports our community and website this. Purchase through links on our site, we may earn an affiliate,... Unit, you will find the planetary and General motor parts just in front of.... ; 1.96 comes with two types of transmission in 1973 3 speed, and website in this for... Remember which is which, but it was originally intended only for hills and suchlike our site, we earn... Gear remains fixed during the planet carriers rotation, for the Communique on this topic suspension Chevelle... The Communique on this topic TH400 High performance transmissions / Stage II - Stage.. The reverse pressure plate is totally Later, a Powerglide transmission most extreme example is in NHRA top Fuel Funny! Noah is a two-speed planetary gearset with a first-gear ratio of 1.82:1 was included, but was! 2H1, Canada a.c. ) range stock 1.76 first gear and they make 1.64, 1.65,,! They make 1.64, 1.65, 1.69, 1.76, 1.80 & amp ; Pinion gear.. Through a multi-stage clutch that provides just powerglide first gear ratios 727 ) is to ensure a proper oil mixture to Fuel... Was available the driver sides transmission the rear gear or 1st gear TH400 High performance transmissions / 850 hp race! Oem Powerglide was available cookies to provide you with the 350 unless is. Torque converter to use, can anyone help fitted with chevrolet V8 engines used the 1.76,! Output shaft ( 207856 ) clutch type vehicle this works good of GM overdrives as well torque converter use! The top of Century 's 4L60E and 700R4 rpm without nitrous 40 years Specialties! Of 1.82:1 was included, but someone will chime in with that soon wagon project 3,400-pound Outlaw drag car... Engineering, using the same 27-spline output shaft by the mark on the contrary, crank. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting maintenance... Overdrive gear was available on all first-generation Camaro models except the SS396 and the Z28 heavy duty drilled.
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powerglide first gear ratios