will a transmission from a 2000 pontiac grand prix supercharged (3.8L engine) properly work and be functional in a 2006 chevy impala LT (3.5L engine)

Julian Conte

Asked by Feb 28, 2016 at 07:51 AM about the 2006 Chevrolet Impala LT

Question type: Maintenance & Repair

i financed a impala from a car lot and 1 day after having car the
transmission fragged out on me (completely shot).Now i returned vehicle
and the mechanic on the lot said he is swapping the transmission from a
2000 pontiac grand prix supercharged,which i believe is the 3.8L engine
and putting that in my 2006 chevy impala with a 3.5L engine and reassures
me that "it will be just fine".I've done some research and i know the correct
transmission my vehicle requires is the 4T65-E.can someone please help
me? I need to know if they are BS'ing me.thank you

5 Answers


So there is a kit that can purchased to make the conversion. I don't know if it is worth the expense. This will depend on your expertise as a DIY Mechanic. To make the modifications in a shop would require a ton of labor, approximately 12-18 hours, depending on the current trans set up in the Impala, if it's already gutted, and if the shop charges you a "disposal fee". If you are confident in your own skills, it will take some time but yes, it is possible. The main benefit to the SuperCharger vs a turbo, is the the Intercooler portion is omitted. The only thing I would worry about is ensuring that the oil cooler in the impala can handle the torgue from the upgraded tranny. I would be curious to see how this goes! Let me know Julian and best of luck! :)

1 out of 1 people think this is helpful.
Julian Conte

thank you very much 6ft.the guy is telling me the only difference between the two transmissions is the shift indicator onmy trans is internal and the pontiacs is external.so they are running a new wiring harness.but assures me that it will work.now i know there is a torque converter size difference between the two transmissions. but im worried about the valve body difference between the two and my transmission is a bit more "modular"with the sensors and all. the range sensor etc. so do you think these trans can be interchangeable? and work?

1 out of 1 people think this is helpful.
Julian Conte

and yes its gutted already.the labor isnt the issue.im just hopeing they arent slappin something together to get me up the street and when it craps on me they wipe there hands clean and say "oh well its your car now" u know?

Tom Demyan

I'd call a local transmission shop to confirm, they should know all the specifics.

1 out of 1 people think this is helpful.
Julian Conte

thank you. i plan on doing that 1st thing in the morning.thank you again

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