the casting on it is GM and the number is 6273212. Anyone have a good site i can look this up on, or some good knowledge?

Sounds like one. GM used a couse spline from about 68 ish to about 81 ish. then they went to a 32 spline. Those are plentiful. When they went to the course spline most got a 208 case but there are 205's with the fine spline just a little harder to find. Down side is those also came with a slip yoke instead of the fixed yoke on all the pre 80's. They can be converted to a fixed yoke by swaping the parts over.

Originally posted by Grim Reaper
When they went to the course spline most got a 208 case Down side is those also came with a slip yoke instead of the fixed yoke on all the pre 80's. They can be converted to a fixed yoke by swaping the parts over.

I think you mean that the 80's and earlier came with the course (10) spline and fixed yoke?.:confused: and 81 and later had fine (32) spline with a slip yoke. Right
:D

Originally posted by Dentista
the casting on it is GM and the number is 6273212. Anyone have a good site i can look this up on, or some good knowledge?

Yeah thats the number cast in my 465