I just installed a Tranny out of a 94 lt1 into my 96 lt1 . The only diffrence between the 2 was the speed sensor located in the rear of the trans , the pig tails were completly diffrent sizes . Here's my question , i was told that if i spliced the other pigtail onto the harness it would work correctly . Well I have a check engine light on now , but yet my speedo works . Under hard acceleration in overdrive it'll hit the limiter before it will shift . In Drive it will just jerk almost feels like a broken tranny mount but i know mine is ok . And theres a funny sound from the tranny when under a load . Does that speed sensor have to be the same one out of my 96 OBD2 car to make the trans work correctly , basically does it control alot more then just speedo ?? If anyone can help me out it'd be appriciated , besides that prob trans shifts firm , great build and i have a vig 3200 stall that was just flushed ....

 

Pull the code, I'm guessing it'll be a TCC PWM "apply feel" solenoid error. This solenoid, along with a PWM-capable pump, was added in '95. This also added another pin in the case connector. Also, starting in 96 they changed the 3-2 downshift solenoid to a on/off design, rather than the PWM controlled solenoid. This one shouldn't be as big of a deal, since the PCM will simply toggle it on/off.

 

I still have acess to the old trans , can i just switch the speed sensor and the connector to get it to work correctly??

 

Just get the speed sensor wired up, and if you have LT1edit simply turn off the code for the missing solenoid. No problemo..