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GM 4T60-E transmission

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4T60-E/4T65-E
Overview
ManufacturerGeneral Motors
Production1990–2011
Body and chassis
Class4-speed transverse automatic transmission
Chronology
PredecessorTurbo-Hydramatic 125
Successor6T70

The 4T60-E (and similar 4T65-E) is a series of automatic transmissions from General Motors. Designed for transverse engine configurations, the series includes 4 forward gears. The 4Txx family is an evolution of the original Turbo-Hydramatic 125 transverse automatic introduced in the late 1970s and the Turbo-Hydramatic 440 transmission developed in the mid-1980s.

The "-E" transmission is electronically controlled and features an automatic overdrive transaxle with an electronically controlled torque converter clutch.

The 4T65 is built at Warren Transmission in Warren, Michigan.

4T60-E

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Main article: Turbo-Hydramatic 125

For 1991 GM introduced the 4T60-E which was a 4T60 with electronic controls, first seen on the new Buick Park Avenue. One benefit was that the cruise control was integrated into the gearbox' electronic control module, improving the ability to maintain a set speed while avoiding needless shifting, thus lowering fuel consumption and noise levels.[1] By the mid-1990s, the 4T60-E was the transmission of choice in nearly every front-wheel drive GM vehicle with the exception of compacts. A heavy-duty 4T60-E HD was produced in 1996 for the supercharged GM 3800 engine and reused in mid 2005 to 2009 with an LS4 5.3 liter V8 in four different models the Buick Lacrosse Super, Chevrolet Impala SS, Chevrolet Monte Carlo SS, and Pontiac Grand Prix GXP. The 4T60-E was phased out in favor of the 4T65 beginning in 1997.

The 4T60-E featured a 245 mm (9.6 in) torque converter with varying stall speed and gear ratios. For example, a 1995 Beretta features a 1650 rpm stall converter as opposed to a 1999 Century converter with a stall of 2095 rpm. In the 4T60 family of transmissions, the combination of drive-chain sprocket ratios and the differential gear ratio together offer up to 12 different possible final drive ratios to allow the transmission family to cover various engine and vehicle applications.

Replacing a complete transaxle should only be done if a unit is verified to be the same as the unit it replaces, as in addition to the up to 12 variants of the final drive ratio, different applications and years can and will have incompatible electrical connectors. The use of an incorrect transaxle will result in undesired operation, up to and including total non-functioning of the transaxle.

Gear ratios:

1 2 3 4 R
2.921 1.568 1.000 0.705 2.385

Applications:

4T65-E

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The 4T65-E was introduced to replace the 4T60-E in 1997. The 4T65-E included a larger 258 mm torque converter for some models and many other changes to improve reliability. It is able to handle vehicles up to 6500 lb (2948 kg) GVWR with up to 280 ft·lbf (380 N·m) of torque. A number of final drive ratios are available, with many distinct models. Starting in mid year 2000 models, all 4T65-E models received an upgraded valve body. Starting in 2003 the internal electronics were changed, hardened 4th gear shaft, ratcheting sprags for input and third gear were added. The last application was the 2011 Chevrolet Impala as GM has transitioned to the 6T70 family transmissions for 2012.[2][3]

Models:

  • M15 — 245 mm (9.6 in) torque converter
  • MN3 — 258 mm (10.2 in) torque converter
  • MN7 — 258 mm (10.2 in) torque converter and heavy-duty gearbox (see 4T65E-HD)
  • MD7 — 245 mm (9.6 in) torque converter (Chinese version)
  • M76 — 245 mm (9.6 in) torque converter (with all-wheel drive capability)

Gear ratios:

1 2 3 4 R
2.921 1.568 1.000 0.705 2.385

Applications:

4T65E-HD

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The 4T65E-HD (code MN7) is a heavy duty version of the 4T65-E used with more powerful engines such as the LS4 V8 and L67/L32 supercharged V6.

Applications:

References

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  1. ^ Pietrangelo, Joel D. (April 1990). "Park Avenue gets electronic transaxle". Ward's Auto World. 26 (4). Ward's Communications: 75.
  2. ^ "4T65E transmission".
  3. ^ Bowman, Zach. "Aging Chevy Impala gets standard 302-hp V6 for 2012". Autoblog.

See also

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