BMW large case diff - help please

Robinxr4i Posted hell of a lot I crash Sierra Posts: 7,775 Club RR Member Number: 143	BMW large case diff - help please Robinxr4i @robinxr4i Club Retro Rides Member 143
	Sept 30, 2011 23:44:59 GMT Select Post Deselect Post Link to Post Back to Top
	Yes, yes I know.... google! I can find loads of info, but non that actually helps me. Basically I'm aware (for 80's/90's) BMWs there are small, medium and large case diffs. I've got a E34 535 with what I've been told is a large case diff, it's definitely got an LSD. However I'm not really a big fan of them and I'm after an open diff to weld up. GR8 4 reverse parking Y0! Anyway which ones came with large case diff? Do/can E39 diff fit? RobOr has already said I should stay away from 540 diff as these tend to be very tall geared. Thanks Robin
	Sierra - here we go again! Apr 28, 2024 19:04:39 GMT WillCarter said: He has an illness, it's not his fault.

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rob0r East of England Posts: 2,743 Club RR Member Number: 104	BMW large case diff - help please rob0r @rob0r Club Retro Rides Member 104
	Oct 1, 2011 19:28:53 GMT Select Post Deselect Post Link to Post Back to Top
	Me again . www.bmwe34.net/E34main/Upgrade/Recipe.htm Really I would be sticking with 3.5 M30 engined cars (E34/E32), manuals are 3.46 ratio, autos are 3.91. 540i are seriously tall at under 3.0, avoid! I think E28 535i are large case too, but the casing is physically different and you'd have to swap diff internals - not a nice job. Again I don't know about E38/E39 but I would assume the cases are different and the ratios would still be terrible. After the 3.5 engines it seemed that the diff ratios went very tall. The cars with compatible large case diffs are E32/E34 - 535i, 540i, 735i, 740i. The 3L V8 530i doesn't have a large case, but I don't know about 3L M30. I'd just be sticking with 3.5 diff, manual for the same ratios, auto for shorter ratios.
	Last Edit: Oct 1, 2011 19:29:51 GMT by rob0r E30 320i 3.5 - E23 730 - E3 3.0si - E21 316 M42 - E32 750i ETC

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rob0r East of England Posts: 2,743 Club RR Member Number: 104	BMW large case diff - help please rob0r @rob0r Club Retro Rides Member 104
	Oct 1, 2011 19:32:33 GMT Select Post Deselect Post Link to Post Back to Top
	Winner winner chicken dinner? www.ebay.co.uk/itm/BMW-E34-535-auto-diff-/320767873904 I doubt you'll find one cheaper, I sold a manual 3.5 diff for £60 recently.
	Last Edit: Oct 1, 2011 19:33:15 GMT by rob0r E30 320i 3.5 - E23 730 - E3 3.0si - E21 316 M42 - E32 750i ETC

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Robinxr4i Posted hell of a lot I crash Sierra Posts: 7,775 Club RR Member Number: 143	BMW large case diff - help please Robinxr4i @robinxr4i Club Retro Rides Member 143
	Oct 3, 2011 14:59:55 GMT Select Post Deselect Post Link to Post Back to Top
	Oct 1, 2011 19:32:33 GMT rob0r said: Winner winner chicken dinner? www.ebay.co.uk/itm/BMW-E34-535-auto-diff-/320767873904 I doubt you'll find one cheaper, I sold a manual 3.5 diff for £60 recently. You Sir are a hero!
	Sierra - here we go again! Apr 28, 2024 19:04:39 GMT WillCarter said: He has an illness, it's not his fault.

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