
Originally Posted by
Z-Rod
Hi L&M,
Be very careful with the advice you receive about your '94 4L60E transmission and ECM controls. All late model computers expect to see a PWM TC. The difference between a PWM TC and non-PWM TC is about $2,000 in an unneccessay tranny repair. Running the wrong TC will ruin the TC "clutch plates" in a few months. There are too many examples of failed tranny because of this.
Here is what I did on my 1994 Z-71 with the stock non-PWM tranny. Nelson tuned my 2005 computer so it did not pulse the TC clutch. He also had to re-pin the tranny plug to match my tranny. Code P2761 was deleted among other things needed to make the computer control the non- PWM TC. The proper operation of my TCC was confirmed with a GM Tech II scanner. My TCC locked and unlocked as it should with 0% slippage. You need to hook up the wire from the brake pedal that lets the ECM know when the brake is applied. I would, however, make sure your tranny is modified to handle the extra HP... the factory 350 was rated at 200hp.
there was a period of ECMs that could not be modified like the 2005 ECMs... so you will find some people say that you can't use these trannys. If you are using a ECM like mine... you are in luck providing it is programmed correctly.
This is a blatant plug for Nelson Performance... The guys there know their stuff. They are experienced with these swaps and understand the inside of those little magic little boxes.
Z-Rod