how can you tell what series a posi is? no gears came on it and it was out of a 98 Z28.

 

most likely i'm wrong but i thougth i read or heard all 4th gen rears were 3 series. the differance is the thickness of the flange the ring gear bolts to

 

what happens if you are wrong and it is a series 2 and i install 3.73 gears on the diff and start launching it at the track?

 

ede:
It's not the thickness, it's the position of the flange in relation to the ring gear side bearing.
If it is a 2 series get the thick gears if not get the regular gears ( they do make both).

 

ok thanks don, i guess i had it about half right in my head, i thought they used additional material in the mounting flange to move the ring gear. guess if i'd thought about it for a bit i know, even used, spacers and the differant gear thickness. well i never claimed to be anything more than a dumbass and i guess this proves it, thanks again

 

well iknow for a fact that some 4th gens had 2.73 rears... so it could be a 2 series carrier.

 

if the ring gear mounting flang is to thick-> could you shim the carrier close to the driver's side to adjust for the difference in thickness?

if the ring gear mounting flang is to thin -> could you buy the thicker ring gear set from SLP?