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View Full Version : Looking for a E36 LSD 3.91 diff


greekthang
04-20-2005, 04:06 PM
I have a E36 Me 3.15 LSD diff and I want to upgrade to a 3.91. Does anyone have one for sale and is will to trade for mine ?? PLease le tme know regardless.

Thanks

RevShoT
04-20-2005, 05:27 PM
i have an open one for 100 bucks?

greekthang
04-20-2005, 06:57 PM
i have an open one for 100 bucks?

Not looking for open end pal read my post I want an LSD 3.73 is ideal but I will settel for a 3.91

RevShoT
04-20-2005, 07:05 PM
Not looking for open end pal read my post I want an LSD 3.73 is ideal but I will settel for a 3.91

hey relax! i was just offering a cheap solution!

NickP
04-20-2005, 07:08 PM
I was running the 3.73 with my S50/ZF for awhile; it was way too much gearing - first gear was useless and 100km/h was around 4k rpm if I remember correctly.

edit: 1000th post - woo hoo

greekthang
04-21-2005, 09:25 AM
hey relax! i was just offering a cheap solution!

I am relaxed buddy. I already know what your selling and I said I want an LSD
If I wanted a non-LSD I would have said NON-LSD.

NickP no worries at the higher RPM I have a couple plans witht he tranny that will bring those RPMS down. Possibly an extra gear but I am still thinking about it

SickFinga
04-21-2005, 11:24 AM
Not looking for open end pal read my post I want an LSD 3.73 is ideal but I will settel for a 3.91


You should check Chuck's Auto I think he has it.
And I agree with NickP, 3.91 is way too short, even for a 6spd.
Even 3.64 would be way too much.

If you got LSD right now, cheapest solution would be getting used ring and pinion from DiffsOnline.com and install them in your current diff,

http://diffsonline.com/used.htm

greekthang
04-21-2005, 03:43 PM
You should check Chuck's Auto I think he has it.
And I agree with NickP, 3.91 is way too short, even for a 6spd.
Even 3.64 would be way too much.

If you got LSD right now, cheapest solution would be getting used ring and pinion from DiffsOnline.com and install them in your current diff,

http://diffsonline.com/used.htm

Thanks for the info SickFinga I will think about it for sure

thinair
04-21-2005, 09:20 PM
Please guys, no personal attacks, and no 'he started it' stuff either.

Anyway, Greekthang, you might have a hard time finding a 3.91LSD, they're stock in a few 318's but their diff casing is smaller. What you can do if you wish, and it might be a cheaper solution, is pick up an open 3.91, and swap the pinion and ring gears into your 3.15. And you have a 3.91LSD for $100+labour, and a spare diff case incase you ever need it, or you could just rebuild the remaining pieces into an open 3.15 diff and sell it off for $100 to a 325/328 owner in need. That is just my opinion, and what I would do in your situation.

Also, a 3.91 is short, but for a 6spd it'll bring you back into the range of a 5spd, with an extra gear, which isn't all that bad. You'll top out at 252km/h at 7000rpm, with 235/40/17 tires. First gear will be practically useless though.

jeffrie
04-22-2005, 07:21 AM
Is this also doable with a open 4:10 diff?
If I went to diff's online ordered and just change the pinion and ring gear It could have Limited Slip? Or is it just impossible with the smaller diff?

SickFinga
04-22-2005, 08:40 AM
Please guys, no personal attacks, and no 'he started it' stuff either.

Anyway, Greekthang, you might have a hard time finding a 3.91LSD, they're stock in a few 318's but their diff casing is smaller. What you can do if you wish, and it might be a cheaper solution, is pick up an open 3.91, and swap the pinion and ring gears into your 3.15. And you have a 3.91LSD for $100+labour, and a spare diff case incase you ever need it, or you could just rebuild the remaining pieces into an open 3.15 diff and sell it off for $100 to a 325/328 owner in need. That is just my opinion, and what I would do in your situation.

Also, a 3.91 is short, but for a 6spd it'll bring you back into the range of a 5spd, with an extra gear, which isn't all that bad. You'll top out at 252km/h at 7000rpm, with 235/40/17 tires. First gear will be practically useless though.

Actually 3.91 LSDs are pretty common.
They are from automatic 325s (not all are LSD though)

greekthang
04-22-2005, 08:51 AM
Please guys, no personal attacks, and no 'he started it' stuff either.

Anyway, Greekthang, you might have a hard time finding a 3.91LSD, they're stock in a few 318's but their diff casing is smaller. What you can do if you wish, and it might be a cheaper solution, is pick up an open 3.91, and swap the pinion and ring gears into your 3.15. And you have a 3.91LSD for $100+labour, and a spare diff case incase you ever need it, or you could just rebuild the remaining pieces into an open 3.15 diff and sell it off for $100 to a 325/328 owner in need. That is just my opinion, and what I would do in your situation.

Also, a 3.91 is short, but for a 6spd it'll bring you back into the range of a 5spd, with an extra gear, which isn't all that bad. You'll top out at 252km/h at 7000rpm, with 235/40/17 tires. First gear will be practically useless though.

Thanks for the solution thinair. Your diff is great but I think I want more off the line pull but I know I am not buying a 3.91 off that prick Revshot that for sure. Anyways maybe I can get a 3.46 or 3.73 out there. Do they exist ? Something between 3.38 and a 3.73 ?

thinair
04-22-2005, 11:37 AM
Yep, you have the 3.38, 3.46, 3.64, 3.73. It all depends on what car it comes out if. For the most part the diff cases are different, (if it comes out of an e28, e30, e32, e34, etc) but the internals are interchangable (188 gearset), unless they're out of a large case diff, like the e36 M3 evo, 540i's, M5, 750i, etc (210 gearset). I don't remember exactly what cars have the larger internals, but it's usually the higher power models, V8's and V12's.

You're easiest solution would be to call diffsonline.com for the gears, let someone else search for you. Of if you have the budget, just get one of their complete diffs, properly rebuilt with 40% lock. Although they're like $1400US with your diff as a deposit, or $1700US without, but you get what you pay for, and I've never heard a complaint from their diffs.

With my 3.38 in my car, in 5th I top out at 241km/h at 7000rpm (yes, I've checked), with a 6spd you'd top out at a theorhetical 291km/h, depending on if the engine has enough power to overcome the aerodynamic drag at that speed.

Sickfinga, you're right, I always overlook the auto trannies (except the M3 3.38 :P)

Jeffrie - if you have an open 4.11, and you want to keep the 4.11 gearing, you'd have to find an LSD and swap the guts into yours. If you buy the gears from diffsonline.com, you only get the gears, no LSD unit attached, although I suppose they could sell you an LSD unit, I just have no idea how much.

jeffrie
04-22-2005, 12:07 PM
Thanks, I'll look into it only wanted a 3:91 with the thought that their was no such thing as a 4:10 LSD might still be the case, Hope I can make one.

RevShoT
04-22-2005, 03:59 PM
what makes you think i would sell you the diff after the way you carried yourself on here anyway?

i offered you a cheap solution and you threw it in my face, your loss not mine

greekthang
04-25-2005, 09:53 AM
what makes you think i would sell you the diff after the way you carried yourself on here anyway?

i offered you a cheap solution and you threw it in my face, your loss not mine

LOL my loss. Your the one selling it not me. Its your loss. Whatever man I am not here to continue this no more. Your not worth the time. I threw nothing in your face. All I said was read my post and you acted like a bitch so you got treated like one. Its really very simple