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BMW 2002 AND E21 DIFFERENTIAL


sawn77

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The rear cover is obviously an e21 part but the output flanges appear to say '02 to me. There are good detailed threads on this forum regarding dating and identifying '02-e21 diffs. And...10 out of 10 potential buyers will want to know a.) the ratio, and b.) whether or not this is an LSD, neither of which is currently disclosed!

And, oh yes, this ad would be more correctly listed under "Parts for Sale" rather than "Cars for Sale"!

GLWS,

Steve

Edited by Conserv

1976 2002 Polaris, 2742541 (original owner)

1973 2002tii Inka, 2762757 (not-the-original owner)

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Thank you for information you provide

Is there any number on differential which can provide the ratio ?

You can turn the input shaft and count, precisely, how many revolutions the output shafts make. Many '02 diffs are stamped with the number of pinion and ring gear teeth on the left front side of the housing. Below is a photo of an e21 diff with complete stampings:

11 S 40

5

8

Which translates to 11 teeth on the pinion gear, 40 teeth on the ring gear (yielding a ratio of 3.64 -- thanks for catching my error, gaius!). The "S" indicates a limited slip unit. And the 5 over the 8 indicates the unit was completed May 1978.

Beware: it's possible to change the ring and pinion set, rendering housing markings irrelevant. Common? No. Possible? Certainly. The sure-fire solution is to simply remove the rear cover and count gear teeth.

Most '02 diffs are 3.64s. Limited slip '02 diffs are quite rare: your price is low for a good '02 LSD, within the range for an e21 LSD, and $500 to $650 too high if it's not an LSD!

Here's a typical thread on identifying diffs:

http://www.bmw2002faq.com/topic/160737-differential-identification/

GLWS,

Steve

post-41123-0-21976100-1448486396_thumb.j

Edited by Conserv

1976 2002 Polaris, 2742541 (original owner)

1973 2002tii Inka, 2762757 (not-the-original owner)

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