GM 4L60E Transmission

well in this second section i will be going through some of the background of the 4L60E transmissions. somewhere between 1992 and 1993 the 700R4 became a computer controlled tranny and was/is redesignated the 4L60E/4L65E. It did not have a governor or throttle valve cable(TV cable) as the earlier models did. the 4L60E uses electrically fired solenoids for shift and what is call a pulse width modulator(PWM valve) in place of  where a governor and modulator valve would be on an older tranny. this is also referred to as a force motor by some people. The on- board computer then dictates shift points,  TCC operation, and overall function of the valve body. most of the mainline internal components are similar(if not interchangeable) with the 700R4. the main difference between the two is the valve body on the 4L65E is made of aluminum instead of cast iron and is fully computer controlled.

The 4L60E also received upgrades throughout the years as well. the 93-94 models had their own valve body set up/1995 was unique unto itself/and the 96 and later models also were different yet. in 1998 them made the housing a 2 piece design with a removable bell housing.

one thing with this line of transmissions over a th350 or good old th400, there were A LOT of different kits and what not. just looking through my book there are 3 different rebuild  kits for the older 700R4 and 3 or 4 different kits for the 4L60E, so getting the right kit for the right tranny and application is somewhat critical. you must also correct things on these trannys that aren’t even defective because they are common fail points. as a rule a thum- the older the tranny the more updates you are going to need. 

S3700001So, i got  this bastard 95 vintage core in on trade. unless i plan on sticking it into another 95 conversion van from connecticut that died out here… was a heavy metal band on tour by the way……….it was more cost effective to play with the older 700R4 and put this in the core archive for future use.  These things are all over the place….and i get probably 4 calls a month during the winter of these trannys going out in GM trucks moving snow.  i bet you pass at least 5 of em going to work everyday on the highway in operation. there are shift kits available and like the 4L80, there is performance software out on the market to adjust your shift firmness and timing via the laptop computer or aftermarket programmable module that plugs into your OBD diagnostic connector. i haven’t dealt with these systems first hand yet.

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