Swap G6 4t45e in gagt? [Archive] - GrandAmGT.com Forum


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05-18-2010, 12:51 PM
As the title reads, I'm looking into swapping for a low mileage 4t45e(G6 GT for correct gear ratio) because my trans is slipping. Reliability is the name of my game here. I wanted to see if there is any more work required or not possible factors included in the following parts of the swap.

1) Main wiring harness plug
2) Trans case compatibility

05-18-2010, 01:08 PM
Good Question... im in the same boat as you.

05-18-2010, 03:16 PM
Depends on the year of the trans and of your car, and how much was changed between, but most likely it will work. Go here http://archives.media.gm.com/us/gm/en/news/events/pig_index.html
for info on previous years of 4T45E transmissions. When you go to each year trans, there is a link that will says "new or changed", that will tell you everything they did for that model year. Probably will want to check all the years between yours and the trans you are looking at to be safe.

05-18-2010, 03:22 PM
i took a look and as far as i can tell they didnt change the trans between 01-05 it should work just fine

05-18-2010, 03:38 PM
^well, they did make changes to the trans, especially in '02 and '03, but most of the changes were internal and for durability... nothing that should affect swapping it into an older car.

05-18-2010, 03:40 PM
yeah i have a newer GA trans in my car that is built up

05-18-2010, 03:48 PM
i cant navigate the site for crap but it looks to be possible from the g6.
good info tho

05-18-2010, 06:25 PM
The side cover is different on the g6 so the side mount will not bolt up unless you swap them. I also think that the tap shift feature in the g6 may have changed the electronics inside the trans.

I would like to see someone give it a try though, the newer transmissions seem to be cheap and abundant.

05-18-2010, 10:21 PM
Mildly off topic...

What would an average rebuild cost on your own tranny.. vs a swap?

05-18-2010, 11:05 PM
i got quoted 600$ to have a transmission rebuilt with stock stuff including labor

05-18-2010, 11:42 PM
I was quoted 1400 to have it mildly built.

05-19-2010, 12:14 AM
Damn.. i guess it would almost be worth looking into a swap for around $1400 on a rebuild...