94 3.4 grand prix gtp trans compatability

[E.S.]

The transmission in my prix is going bad. When checking the yards they are claiming only a 4t60e from a 94 or 95 3.4 car will work. Anyone know the reason behind this? I understand there is a difference in the gearing. But is there a physical or electronic difference betweena 3.1 tranny and a 3.4?

[robertisaar]

IIRC, you should be able to use any 94-96 LQ1 4T60E, and any W-Body 3100 4T60E from 1993-1999.

the gearing difference is absolutely minimal, 3.43 compared to 3.33 FDR. the torque converters also stall within 30 RPM of each other.

ideally though, any 94-95 3.4 or 93-95 W-body 3100 trans will quite literally drop in place with no worries about anything being different.

[gpse3400]

Technically he could but the pwm soleniod was added to the TCC circuit in '94. '91-'93 did not have that... not that you need it... The early ones also had some pressure switches, but the '94+ did not use them...

[robertisaar]

actually, every 4T60E from 91 and up used the PWM operated TCC, except for the 91-93 LQ1 and 93-94 LH0 applications. and the pressure switches from the early ones? they're actually shifter position indicators.

[E.S.]

Actually I believe they were saying something about a mount being different. I'll check back with them later today.

[gpse3400]

actually, every 4T60E from 91 and up used the PWM operated TCC, except for the 91-93 LQ1 and 93-94 LH0 applications. and the pressure switches from the early ones? they're actually shifter position indicators.

Yes I am only talking of the 60V6 applications.