I have 2002 pontiac bonneville and my transmission going out and i have a transmission out of 2000 buick regal laying around. I was wondering if it was compatible. they both have the same mounting points. it had the same motor i have already used it in my bonneville.

They could have different final drive ratios. Solenoids might be different in them. Speed sensor could be different also. You'd be surprised as what might be different even between just a couple of years.

Do you have access to both RPO stickers(white sticker with a bunch of numbers on it in glove box)

i do not have the regal anymore. anything on the transmission that might help?

The data plate tag if its still intact.

this is the only one i can find

did a little research myself and i think the buick is a 3.05 and my bonneville is a 2.93

Usually its the other way around. Bonneville'* tend to have the taller ratio for sporty accelerations. Hence the gramma car of Buicks.

the first pic is by code and the second one by vin decode i am not sure if its 100% correct