Thread: 3800 Engine swap question (lesabre to GP)

What trans and pcm are you using? 98 Pcm cannot work with a 03 trans and Vs versus. You will need a 2003 pcm. Also if it came from a lesabre Id think it has a 3.05 Gear ratio and not the 3.29 in your GT(not 100 percent sure)

If your still using the stock trans and stock PCM you need to swap out the maf sensor to your 98 if your using the 03's. They are different and the maf sensor will play havic on trans line pressure

We are using the 03 trans with the 98 pcm. You say we need an 03 pcm. Would we need a GP pcm or a lesabre pcm? We were told by a couple of poeple that the 03 trans would work fine in the 98; only the gear ratio would be different. Can we reprogram the pcm with a tuner program?

The code on the scanner is P1810.