'00 GA trans into '01 Impala?

[Brad_Olson]

I have a chance to pick up a 3400 and automatic transmission from a 2000 Grand Am. Is this transmission the same model that's in my 2001 Impala (also 3400)? I'm thinking that I could have it rebuilt and then swapped in.

Thanks!

Brad

[bszopi]

2001 Impala most likely has a 4T65-E, whereas the 2000 GA will have either a 4T40-E or 4T45-E.

[Brad_Olson]

Interesting. Do you know if they're interchangeable? Or are the cases physically different?

Thanks!

Brad

[bszopi]

Waaaaay different sizes. The 4T65E is significantly larger.

[Brad_Olson]

Shoot.

Thanks for the help; it saved me some time and money. Guess I'll keep looking!

Brad

[torq455]

yes, two entirely different sizes and internals. you'd also have to be able to tune for the different FDR and slightly different gear ratios.