TheRX7Project

iTrader: (3)

I've been searching long enough now I ask.

I eventually want to swap to an LSD in my SA, do I need the whole rear end hub-to-hub or just the center section?

Rogue_Wulff

You can do it either way. A center section from an 81-83 GSL diff will bolt right in, and retains the drum brakes. However, the 83 uses a different driveshaft. 84-85 centers cannot be used, due to different axle size (diameter). Some say the late 83 had these larger axles, but my late 83 did not.
A complete unit from 81-85 will bolt in, but you will need to modify the brake line, and make sure you get the driveshaft to match if the rear axle assembly is from an 83-85. You will also need the park brake cables from the disc brake unit.

TheRX7Project

iTrader: (3)

OK I want to keep my drums... so all I need is an 81-82 center section, or an '83 and drive shaft.

FirebirdSlayer666

iTrader: (3)

That's pretty much it. But just to throw some more information in that the early 83's still had the small driveshaft flange as it was a mid year change, AFAIK anyway.

TheRX7Project

iTrader: (3)

Stupid little changes in first gens...