QUOTE(SiberianFirestorm @ May 30 2008, 10:35 PM)

I do know that some are a 2 series carrier and others a 3. I have seen a few v6's with the 3 series, but most were swapped to it. Obviously, the 3 series is stronger.
Matt
This looks like the kind of diff that stock firebirds come with, at least those that I have seen. As you can tell it doesn't have the bearing or gear ring. No specifications that it uses an Eaton type of lock mechanism to provide full traction when needed.

this is another kind that I have seen, but supposedly it can also fit firebirds. One clarification, V6 birds do they have 26 spline axle and V8 birds have 28 splines, or is it more complex than that? this looks like a very sophisticated differential, some sources I have read from say it usually comes off a Z28 or the light duty trucks.

My TA came with 3.23 gears and with the type of 7.5 10 bolt differential that you see on the first pic. My axle shafts are 28 splines. So as long as a GM differential has those specifications, does it mean it is compatible with these cars? Any info would help greatly.