Rebuilding a 4L60E Transmission with More ToughnessApproaching four decades ago, automakers were scrambling for solutions to fuel economy woes, and GM was no exception. Computer-controlled carburetors and the birth of electronic throttle body fuel injection were not enough to slow fuel consumption. In , GM conceived the Turbo-Hydramatic R4 overdrive automatic transmission as a replacement for the time-honored TH three-speed automatic. What made the R4 different than any previous GM automatic was a new approach to shift modulation through a device known as the throttle valve TV cable. In true linear fashion, the TV cable was able to modulate shift programming based on throttle position and vehicle speed, and this was a system that worked quite well for a time. It was when technicians and vehicle owners began adjusting throttle valve cables, much of the time improperly, that the R4 became problematic. An improperly adjusted TV cable caused irregularities in line pressure and timing to where people were burning up R4 transmissions at quite a clip.
4L60E Part 1 (proper disassembly)
Help with 4l60e parts list
Rotate the transmission so that the bell housing is up. Allow the transmission fluid to drain from the case extension. Remove the servo cover and O-ring seal. If the servo cover seems to be hung up on the seal, cut and remove the O-ring seal before removing the cover. Remove the servo assembly. Apply 11 Nm 98 lb in torque. If the white line appears in the gage slot 1 , the pin length is correct.