78-87 G-Body question

Hi everyone I have had a 1985 Grand Prix 3.8 L since 89'. It is now time The 3.8L gave up the ghost about year ago. I am planning on redoing the whole car, putting in a 383 stroker, th350 or th400, but I don't know what the stock rearend is on the car.

Does anyone know what the stock rearend housing is, I want a 12 bolt rearend housing with 3:55 gears, but I was curious to what is stock, are there any identifying marks to be able to tell. Thanks again.

are there any identifying marks to be able to tell.

If it hasnt been removed, there should be a tag on one of the bolts on the rear end cover.Im sure that is a 10 bolt,but thru the years they used different sized ring gears.


~Larry~