1999 Pontiac Engine And Tranny Swap

**Scimmia** · 09-28-2009

HOLD ON A MINUTE!

The diff ratio is different, 3.05 in the Regal vs 3.29 in the GP GT. This means you would need to reprogram your computer, since I'm pretty sure you can't use a Regal computer in a Grand Prix (BCM issues, I believe). If the diff in your current trans is still in good shape, you could swap that in and you should be fine with your stock computer.

**PGT** · 09-28-2009

Originally Posted by Scimmia

HOLD ON A MINUTE!

The diff ratio is different, 3.05 in the Regal vs 3.29 in the GP GT. This means you would need to reprogram your computer, since I'm pretty sure you can't use a Regal computer in a Grand Prix (BCM issues, I believe). If the diff in your current trans is still in good shape, you could swap that in and you should be fine with your stock computer.

So even if i just drop the tranny in it would not work at all because i thought the diff ratio wasnt that big a deal

**Sabrewings** · 09-28-2009

Originally Posted by Scimmia

HOLD ON A MINUTE!

The diff ratio is different, 3.05 in the Regal vs 3.29 in the GP GT. This means you would need to reprogram your computer, since I'm pretty sure you can't use a Regal computer in a Grand Prix (BCM issues, I believe). If the diff in your current trans is still in good shape, you could swap that in and you should be fine with your stock computer.

I thought GP BCMs were pretty accepting. It's the Chevy and Buick BCMs that give issues.

**PGT** · 09-28-2009

So it would b alright to go ahead and drop the whole tranny in out of the buick into my grand prix with no problem at all then or is there anything i have to keep in mind

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