E30 325i 4.27 or 4.45 gears

[zracer22]

Does anyone know what year and model came with a 4.27 or 4.45 final drive? I would like to find one in a junk yard to rebuild my 3.73.

[James Clay]

4.45 is a motorsport gear set - I can't find one in the US (would have been imported) or Europe right now. 4.27 is an E34 535 auto, 7/90 production and later.

[zracer22]

James,
Thanks for the info. I already have a 4.10 out of an M3, but would like to get atleast a 4.27. I found a LSD out of a 91 535 auto for $400. I'm assuming that the differential won't fit in my E30, and that I will have to rebuild my 3.73 with the gears from the 4.27. I am I right or will the E34 diff bolt right into my E30 325is?
Thanks again.

[James Clay]

You will have to build it with an E30 housing. E30, E28, E23, and E24 housings all fit, nothing else.

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James Clay
http://www.bimmerworld.com
Engineered BMW Performance
World Challenge/SCCA/BMWCCA Racecar Rental
Genuine OEM and Used BMW Parts
(540) 639-9648
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