Transmission Match Ups

[Matthew Mericle]

Hi everyone, I own a 2002 Pontiac Grand Prix SE and I want to swap out the 3.1L LG6 V6 (mine says 3100 SFI V6. Not sure if they're the same engine or not) with a 3.8L 3800 Series 2. I want to know If I should get the 3.8L S/C because I plan on putting a turbocharger in it or if I should just get the 3.8L with no S/C? My main goal is to up the engine to a 3.8L because many of my friends say the 3.1L wouldn't be able to handle a turbo (they mostly deal with Civics) and I want to up my 4-speed auto to a 5 or 6 speed auto but I can't find out what 5 or 6 speed automatic transmissions match up with the 3.8L engines. Which leads to my main question, what type of 5 or 6 speed trannys can I use with the 3.8 that won't potentially get ruined and cost me in end? (If I can even up my tranny to a 5 or 6 speed.) Please let me know my fellow Pontiac drivers and mechanics.

P.S. I know very little about cars and I'm learning on the way.

- Matthew Mericle

 

[Fivefingerdeathpunch]

You cant use a 5-6 speed trans as they make anything that can even be controlled via our PCM.

You best bet is to find a GT or GTP motor with trans, the wire harness, PCM and everything else needed to make the swap and then it might work.

 

[Matthew Mericle]

Ok thanks. Also would you know why my 02 GP overheats while idle? I flushed my radiator, put new tubes, both fans are on while parked and I still can't figure it out. It also says low coolant buti put new coolant in. could it be because my ac doesn't kick on? I forgot what the part was called.

 

[Fivefingerdeathpunch]

You probably need to bleed the cooling system of air.

 

[Matthew Mericle]

I also think I need a new radiator because when I take the cap off I have built up rust and it's still happening after a radiator flush. Plus my abs light stays on constantly even after I put my new hubs on.

 

[dsmuts]

Your lower intake manifolds gasket its probably leaking. Have your abs code scanned could be abs module bad.