I would like to know what the prefered (if any) doner is for the auto a speed 4T60 trans.

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86GT Project

1990 Cadillac V8 FWD, 1990 Buick FWD, 1990 Oldsmobile FWD. Some of the cars made in these years were not Front Wheel Drive, or FWD. By 1989-1990 the bugs were pretty well all gone from any 4t60's

www.gmtuners.com has an excellent data section on the transmissions.

quote Originally posted by BAM-BAM: I would like to know what the prefered (if any) doner is for the auto a speed 4T60 trans.

the caddy v8 cars from 1990 have a slightly stronger HD version of the 4t60. i would recommend those

The Caddy V8 FWD cars had 4T60e transmissions... not the same as the 4T60. 89-91 Grand Prix 3.1MPFI had 3.33 final drive ratio 4T60s, at least my 1991 Grand Prix SE did. They changed over to the 4T60e in 92-93...

[This message has been edited by carbon (edited 09-15-2010).]

quote Originally posted by carbon: The Caddy V8 FWD cars had 4T60e transmissions... not the same as the 4T60. 89-91 Grand Prix 3.1MPFI had 3.33 final drive ratio 4T60s, at least my 1991 Grand Prix SE did. They changed over to the 4T60e in 92-93...

4T60E came in 1991. The 1989 -1990 4T60's were the 'cream of the crop'.

Quoting FieroAddiction's web site:

"The 440T4 or 4T60 is the first generation of transversly oriented 4 speed automatic transaxle. It was used in GM mid and full size vehicles until about 1990. It only requires manifold vacuum to the modulator valve and throttle input via the throttle valve cable to operate. Both are adjustable for shift quality. Torque converter lockup is controlled by the ECM, or aftermarket kits are available for vehicles without a computer. The 4T60 was replaced by the 4T60E. The 4T60E is shifted electronicly using solenoids controlled by the ECM. It still has a vacuum modulator, but the TV cable is eliminated. It will not operate without computer control, therefore it can only be used with an engine that was originally equipped with a 4T60E. "

There were a few 4T60's used after 1991, but ity was a small number. Allante's I think I read once?

The caddy's usually have the lowest final drive gear ratios out of the cars that were available with this trans. Its all because of the front mounted V8's they had. As Joe said, 89-90 are the best of the best before the switch to "E" shifted trans in 91. These years were also only auto FWD cars so any 89-90 caddy will have the trans your looking for. Final drive ratios varied across the line depending on options and model. Parts are still available to further change the chain drive ratios for adjustment of the final. If you can figure out which final drive ratio you are looking for, someone may be able to point you towards a more specific car that already has it.

[This message has been edited by Fieroseverywhere (edited 09-18-2010).]

I came across this information. Handy reference to codes on RPO sticker.

Cars to check: 1983-1992
Pontiac Lumina/Euro
Pontiac Grand Prix
Pontiac Bonneville
Buick Lesabre
Olds Cutlass
Cadillac

ME9 : TRANSMISSION, AUTO 4 SPD, THM 440 T4 (4T60)

F16 : RATIO, transaxle final drive 2.53
F17 : RATIO, transaxle final drive 2.84
F25 : RATIO, transaxle final drive 3.32
F29 : RATIO, transaxle final drive 2.82
F62 : RATIO, transaxle final drive 2.39
F67 : RATIO, transaxle final drive 3.19
F68 : RATIO, transaxle final drive 3.45
F75 : RATIO, transaxle final drive 3.18
F77 : RATIO, transaxle final drive 3.73
F79 : RATIO, transaxle final drive 2.97
FP0 : RATIO, transaxle final drive 2.55
FP1 : RATIO, transaxle final drive 2.72
FP2 : RATIO, transaxle final drive 3.58
FP3 : RATIO, transaxle final drive 2.73
FP5 : RATIO, transaxle final drive 2.95
FP6 : RATIO, transaxle final drive 3.54
FP7 : RATIO, transaxle final drive 3.73
FP8 : RATIO, transaxle final drive 3.54
FQ2 : RATIO, transaxle final drive 3.48
FQ6 : RATIO, transaxle final drive 4.12
FQ8 : RATIO, transaxle final drive 2.96
FQ9 : RATIO, transaxle final drive 3.21
FV0 : RATIO, transaxle final drive 3.67
FV1 : RATIO, transaxle final drive 3.72
FV3 : RATIO, transaxle final drive 3.11
FV4 : RATIO, transaxle final drive 3.71
FW2 : RATIO, transaxle final drive 3.06
FW3 : RATIO, transaxle final drive 4.02
FW4 : RATIO, transaxle final drive 3.89
FW5 : RATIO, transaxle final drive 4.10
FW6 : RATIO, transaxle final drive 3.42
FW7 : RATIO, transaxle final drive 3.83
FW8 : RATIO, transaxle final drive 4.28
FW9 : RATIO, transaxle final drive 3.43
FWS : RATIO, transaxle final drive 4.10
FX1 : RATIO, transaxle final drive 3.94
FX2 : RATIO, transaxle final drive 2.66
FX8 : RATIO, transaxle final drive 3.61
FY1 : RATIO, transaxle final drive 2.36
FY3 : RATIO, transaxle final drive 3.79
FY5 : RATIO, transaxle final drive 3 52
G11 : RATIO, transaxle final drive 2.56

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1993 was the first model year the 4T60-E was used in the W-body cars with the 3.1 V6 and 3800 (3.4 DOHC equipped W-body cars got them starting in 1991).

1992 was the last year the 4T60 was used in the W-body cars.

The 4T60 was also available in some Olds Cutlass Cieras (sedans and wagons) that came with the 3300 V6 as late as 1993 model year.

I have been told to stay away from 1989 model year 4T60/440T4 transmissions because they have some issues (valve body problems? can't remember); don't know about 1990. 1991-93 models are the best.

To my knowledge, most 4T60s that came in Cadillacs had a VCC (viscous converter clutch) while others had the regular TCC (torque converter clutch). The VCC allows constant slippage for better driver feel but GM reportedly had a lot of problems with the VCC systems and did away with them in later transmissions. I think a VCC-equipped 4T60 can be converted over to use a TCC-equipped converter but I'm not sure if it is as simple as just replacing the torque converter. I would ask a transmission builder to be sure.

MOST all 4T60's that came in W-bodies equipped with the 3.1 or 2.8 V6 engine came with 3.33 final drive ratios which is great for performance and would work nicely in a Fiero. Given the 4T60's OD gear ratio, a trans with a 3.33 diff would have on overall effective gear ratio of about 2.33:1 while in OD gear which is better for economy than any ratio I've seen available in a 3 speed auto 125-C. The three main differential ratios made for the 440-T4/4T60 OD transmissions were 2.84, 3.06, and 3.33. Most big GM FWD cars that came with 3800 V6's got either the 2.84 or 3.06 ratio diffs. Some came with a 2.97 overall ratio which was achieved by using a 3.33 diff and a chain sprocket ratio of 37/33. Different chain sprocket ratio and final drive diff ratio combinations were used depending on year, vehicle, and engine so there are a lot of choices available.

Bob (username "Capitol City Fiero") has a Fiero I swapped a 4T60 into that has a 2.84 final drive ratio and a mostly stock 2.8 V6. He reports the car has gotten a best of 40mpg on the highway. But he also says this gearing makes the engine struggle a bit at lower highway speeds and especially in the hills and mountains. If you had an engine that made more low end torque than a nearly-stock 2.8, this problem would be less of a concern. But it certainly won't win any races. If you are concerned about performance, get a trans that has a 3.33 final drive ratio. If you want a good compromise of performance and fuel economy, something with an overall ratio of 2.97 or a diff ratio of 3.06 would be a good choice.

Changing the diff ratio in a 440-T4/4T60 requires complete disassembly of the trans. Three main chain sprocket ratios are available: 35/35, 37/33, and 33/37. Using a 33/37 ratio chain with a 3.33 diff would net an overall ratio of about 3.73:1 for those of you who are interested.

-ryan

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7+ years on this same swap -- NO engine or transmission failures...

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[This message has been edited by rourke_87_T-Top (edited 09-16-2010).]

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