Is there a way to tell what type of 350z diff one is, without the car. Is it stamped on the pumpkin? If I remove the cover, will the final drive ratio be engraved or molded in the gear or somewhere? I plan on buying a VLSD, but the OP is unsure if its originally from an auto or a manual. I don't want an auto final drive. I tried google this but all I found was diff ratios with the model and trim level they come stock with. I know a stock manual is 3.5, and I believe a stock auto is 3.3.

Sum:
Can I look at a diff and find out what its final drive ratio is?

 

I would also like to know this! Subscribed.

 

I'm 99% sure the pumpkin itself is the same between them. The gear ratios are different and if you're going from an open diff to VLSD the stub shafts are different.

 

5AT: 3 bolt propeller shaft flange.
6sp: 4 bolt propeller shaft flange.

 

Gb: 5at Vsld differential
GD: 6mt vsld
Gc: 6mt open diff.

Check the words painted on the pumpkin

 

OK... but is the ratio written somewhere? I would like to see if its a 3.3, 3.5.. ect

 

I believe that's on the later chassis (370, G37) I've done many sets of diff bushings and only seen pics of the 3 bolt setup.

 

Obviously all 5at (GB marking)comes with 3.3 and All 6mt (gc and GD marking) comes with 3.5.

 

If you wanted to confirm the ratio, why couldn’t you just turn the input shaft and carefully count the number of turns of the axle shaft?