1989-94 D1/V8 Quattto

Audi Part # 017525121A

Limited Slip torsion differential factory OEM Audi. Only came on V8 Quattto’s. 
all other rear differentials were open diffs not LSD. 

These fit C3/200 Quattro and C4/S4 Quattro cars as an upgrade to the open rear differential’s that they came with.

local pickup in the portland/Vancouver area preferred. Shipping TBD after sale if shipping is needed.

I also believe they are using these in the center differential with some fabrication to have a torsion center differential.. these are very rare.