What model can I find a diff from???

[Mr.SWISS]

I wnat something with little mod to work(cover, output flanges) that will give me about 3.25-3.55 in LSD. What is the most plentiful?

[FredK]

The 3.25 is more common than the 3.46. Either way you're going to have to scour salvage yards, ebay, or the classifieds sections.

Worst case scenario you can get a 2.93 from an eta for now, and swap to a better ratio later.

[Garageaholic]

You want a 3.25, start looking at E28's, you just need to swap the rear cover and half shafts (easy job)

[Mr.SWISS]

You want a 3.25, start looking at E28's, you just need to swap the rear cover and half shafts (easy job)

I read the e28 535is has a larger case than all other, any trwoof?

[Garageaholic]

nope, same size. I got my 535i 3.25 from that car. I dont' know about E34 535i's though that had the same M30 engine.

[NZM50SWAP]

Dude some e28 535's and all e28 m5's had large case differential's. These will not fit into a e30. Different mounting points on the subframe. Trust me I bought a large case for my swapped e30 and could not fit it without making serious modifications. The way to tell betweent the case's is large case has 8 bolts holding the side plates togetther(the part that bolts to the halfshaft) medium has 6 and small case that came on most 4cyl have only 4 bolts.

hope this helps

[Garageaholic]

I stand corrected. How about this:

Before buying an e28 535i 3.25 differential, ask for a picture of it so you know which one you are getting, bc apparently there is a large difference such that you could visually identify the discrepencies between the two.

[SchnellerVert]

Shop over on www.mye28.com they like 3.73lsd and maybe you will get luck with an even swap.

[Garageaholic]

Good luck getting an account with them there. lol

[BigD]

Worst case scenario you can get a 2.93 from an eta for now, and swap to a better ratio later.

I think the 2.93 will actually give you a stock E36 ratio because of the smaller wheels of the E30.

[FredK]

Yeah, the 2.93 will definitely give you great highway cruising.

[MR 325]

E28 or E24 diff is what you'll want.

[NZM50SWAP]

2.93 worked well for me. e34 2.5 m50 with e30 zf (yes that's rite it's a e30 ZF) gearbox m20 flywheel/ clutch /starter etc

Was good on open road but a little bit tall for around town in heavy traffic.

I could 193kmh outta 3rd gear

[Mr.SWISS]

E28 or E24 diff is what you'll want.

So Matt, will a S3.54 out of an M6 fit?

[FredK]

I believe the E24 received a 3.64S at one point. The revs will still be pretty friggin high. An M6 diff should work.