I have 94 z28 LS1 5.7 and my transmission is acting up i have low and second and reverse but drive just revs the engine up.Does anyone have any suggestions and what other GM makes and model years will work in my car thanks

 

Scan the PCM for transmission related codes. They don't turn on the SES light, so you don't know if they are set, unless to scan the PCM.

We have at least one trans builder that responds to posts like this on the "Drivetrain" forum. I'll move you post there to improve your chances of getting a knowledgeable response.

 

Hey Fred, were you referring to me?...LOL. When you say it just revs if you put it in drive, do you mean you have to put the shifter in manual 2nd to get it to move forward? Once you get it moving, can you manually upshift it through all the gears? If so, it's most likely the input sprag. The sprags were a weak area in the 4L60E. We always update them to the superior Borg Warner "dual cage" 29 element sprag to prevent it from happening again. If your saying the car goes forward until it tries to make a 2-3 shift, but almost seems like it goes into neutral, it's most likely the 3-4 clutches. Another weak area in a factory 4L60E. The ONLY year trans that will work in your car is a 1994. They were a "stand alone" year. A trans out of a V-8 1994 Camaro/Firebird, 1994 Impala/Caprice, or 1993-1994 Chevrolet truck will physically bolt in and work. A trans out of anything other than an F-Body will require a tail housing swap to use your torque arm tail housing.
Keep in mind that a junk yard trans will still have all the design flaws...If you find one that even works. You might want to check out having yours rebuilt.

Frank

 

it will go in drive until certain speed then revs motor like its slipping do you think it still needs rebuild or can it be fixed easily

 

It will go in drive until certain speed then the motor revs up like its slipping and its LT1 INSTEAD OF LS1do you still think it needs rebuilting or can it be fixed easily and will any 4l60e work i found one website that said 94-97 camaro or firebird but i would have to change tail end of transmission and even said 93-96 s10 truck or blazer long as its 2wd if you can email me please i have hard time working this site.my email is fatboy69nc@yahoo.com thanks for your help

 

Your 3-4 clutches are wasted. It's going to need a rebuild.

I explained in my post above that ONLY a 1994 transmission (or TRUCK '93-'94) will work. It also has to come from behind a V-8 or 4.3 V-6. A 2.8, 3.1 or 3.4 transmission won't work.

Frank