red 95 z28 lt1

asking for a friend will a 94 trans am auto trans work in a 95 firbird formula as a replacement?

Injuneer

The 4L60 was used up to 93. 94 and up is the 4L60E. There will be a mismatch on the converter lockup, because 94 is a switched lockup, and 95 is pulse width modulated. I believe the wiring harness is different, and the PCM control is different.

12SCNDZ

Definitely not. The '95 unit is a PWM (Pulse Wirth Modulated) unit, which means it has an extra soolenoid, and a different locj up strategy. It will throw a cose immediately, and go into limp mode...


Frank

Dave89IROC

You would need to add a wire to the trans harness and flash your pcm with a 95 tune to use the 95 trans

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red 95 z28 lt1

Great thanks my friend was looking for a used trans and had a deal with a unit from a 94 ta but she found one out of a 95 car... Thanks again guys

karkareco

i have a little something to add..or a question i suppose..can the 94 pcm be programmed to run the pwm trans or do you have to use the 95 in order to pulse width modulate the soloniod?

12SCNDZ

You need a '95 PCM and wiring harness. The '95 has an extra wire from the PCM to the transmission

Frank