firemandan1700

iTrader: (1)

Ive been reading in other forums and such about series two and series three carrier type rear ends. I have been contimplating on getting a 3.73 gear upgrade for my car but I do not know what carrier I have and how to distinguish the difference. So...
A) What is the difference in series 2 vs series 3
B) What series do I have?

I have a 2001 Trans Am WS6 A4 currently w/ 3.23s stock rearend

dlk1950

2.73 3.08 = series 2, 3.23 3.42 3.73 = series 3,, you should have a series 3.

firemandan1700

iTrader: (1)

Go figure seemed easy enough. But why have a difference and what makes the difference? Just out for some knowledge.

PadenAlbin

I thought all automatic rear ends were series 2, and manual rear were series 3. No?

FirstYrLS1Z

iTrader: (4)

Automatics were 2.73 (option code GU2) standard and 3.23 (option code GU5) with the performance rear axle.

01ssreda4

iTrader: (96)

No, you need to do more reading. Start with this thread.