tranny interchange?
 

I have a 99 alero 3.4L, which came out of a 01 impala, and I have replaced the tranny about 2 yrs ago, w/ 1 from a 03 Grand AM. So, my drive chain broke in the tranny, 243k miles, not bad for wear and tear,huh? Anyway, my question is; I found another 4T45e, MN5, 3.05 gear ratio out of a 2007 Saturn, 3.5L, same gear ratio - 3.05, same type - MN5, same connector 20 pin; and I was wondering if it will work in my Alero? Now I know there was a few changes in 2005 to the MN5 but only with the Malibu and G6,but no changes for Saturn till 2008. Also, I know the pcm controls the upshifts and downshifts, so if it bolts up, which it does, and plugged in my pcm should see it just another 4T45e right? My pcm has been upgraded by Sinister Performance for crisper shifts at higher RPMs not to mention my engine has been rebuilt with hydra-static pistons,so there is NO piston slap cold or not, new rockers, push rods, and cam. So, guess what I am asking is; is a 2007 4T45e MN5 3.05ratio from a 3.5L interchangable with my 3.4L Alero? That has a 2003 4T45e MN5 3.05ratio in it now.

Should be. I mean people do the 3.5 swaps and keep the stock trans/manual swapped trans in place. So i dont see an issue.

thank you

I answered in the other thread.

The transmission pump was changed in 2004. It works in a different way than 2003 and down transmissions and it is unknown if it requires spiecal programming or even what the programming is. The pump is the only thing that is different in the transmisson though

thx for info, so the pump was changed, but ultimately the pcm controls the tranny right? so i'm thinking if i plug it in my pcm will see it as just another 4T45e, hopefully? I just dont want to spend the money if it wont work, you understand, knowing ahead of time saves wasted fraustrations of having to return and exchange it for another.

And this is why I didn't even bother with the 2004+ transmission. I knew the 03 and down trans would work no problem, I just wanted the better FDR in the GAGTs which is 3.29

Since you've swapped trannies before, you know that the 01-03 axle seals are different than the 00 and down ones. It's not a big deal, doesn't effect anything with programing and what not. Axles still slip right in with no problems or issues.


Yes