How do I find out what differential My car has?

[parkerbink]

Is it in the vin? on the diff? How do I find out?

Thanks!

[OldUser1]

Look at the tag on your diff case.

-Kenyon

[///M42 sport]

for a cabrio auto, its most likely a open. probably 4.10, not sure.
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Ipad Cases

[parkerbink]

Thanks I will go look

[parkerbink]

On the passenger side in the casing it says A0B17 on the driver side in teh casing it says BMW. There is no other marking or label. Does this mean anything?

[KenC]

No, that doesn't mean anything.

If it's a 4.10:1 diff it'll say "4,10"

[theberglar]

It's on a metal tag about 1/2" wide on the diff.

[parkerbink]

No tag or any other identifier on the diff I picked the car up & looked!

[MR 325]

The dealer could probably tell you what all of your original options were if you give them your vin.

[parkerbink]

I am in Mexico & am lucky the dealer can find anything, I ordered 4 parts and 2 were wrong. They were pissed when I refused to pay for the wrong ones.

I got this from the vin from BMW parts database:

E30 Cab 325i M20 USA 19900400 L A
Production Code: BB23, line ID: 45086

Heres the vin if anyone wants to take a crack at it:WBABB2312LEC22971 The car was purchased in June or July of 90 it has a 4/90 build date.

Thanks

[Stu]

Jack up the rear, spin a tire one rotation. Count and see how many times the input flange rotates.

Your car most likely has a 3.73, possibly a 4.10, limited-slip was an option