Hey, I am not knowledgeable about this stuff, can anyone i.d. my differential? It is a 10-bolt the bolts are not seen looking at the pumpkin from the rear of the car (they are on the front side of the case) and it has these numbers stamped on it J 186 and 3725899 GM It does not have a P stamped on it but there is a big O or zero. Also we think it acts like a posi, when we spin one rear wheel the opposite wheel turns backward. I bought the car as a shell with no interior or drivetrain, we're messing around underneath this week trying to install the fuel tank and bend up a 3/8" fuel line and get a little undercoating into the wheel wells and rocker areas at least.
What is my rear end?
garlok
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Sounds like a stock 10 bolt. I don't think it is a posi though. If it were I believe that while turning one wheel the other would want to turn the same direction. I don't know what the O means. Maybe a production plant like Oakland??? Maybe it is just a casting mark. Mine has a mark just before the A317 (my diff #) that might be mistaken for an O but I think it is just a casting mark. Mine has a BIG GM on it. Does yours have a steel tag on one of the nuts? I posted a question about the id tag not long ago and got this answer.
Rog
Then got this:Just to save time.
![Image]()
Hope this helps you out.According to the comment's posted in the thread about a week ago the book show 336 and 355 are incorrect a 336 has one hole and a 355 has two?Randall
Rog
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