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bimmer.rob
06-26-2008, 07:15 AM
Hey guys, I was wanting to know could I use the diff off my 325e parts car on my 325is?

bimmer.rob
06-26-2008, 07:15 AM
oh and if so what would the gear ratios be?

FuryriderX
06-26-2008, 08:09 AM
325e diff is 2.93, likely open. 325iS is 3.73, likely LSD, i believe.

it'd give you lower RPM's on the highway, but you'd notice a performance decrease.

they are definitely interchangeable though.

InfiniteDice
06-26-2008, 11:09 AM
i have a 2.79 lsd... great on the highway came off an 85e

bimmer.rob
06-26-2008, 12:23 PM
Hey guys, Ok so I searched the Vin on Realoem.com Vin# 9803117 ( thats the E ) now it says it has a RMFD LIMITED SLIP DIFF.UNIT Part #33141209655 ... Now I searched my IS also Vin# EC67607 and it comes up with RMFD LIMITED SLIP DIFF.UNIT 33141209653 , one number off. So its not the exact same obviously but is it for sure LSD? and what would the gear ratios be? how could I find that out? thanks.

bimmer.rob
06-26-2008, 02:43 PM
bump

FuryriderX
06-26-2008, 03:32 PM
go under, there's a tag on the diff that says the ratio. if there's an S next to the numbers, its LSD.

craz azn
06-27-2008, 12:22 AM
What year is the parts car? early 325e's came with a 2.79... somewhere in late 85, early 86 it was switched to a 2.93 to help acceleration a tad. If it is LSD, it will turn both output flanges the same way/rotation when you turn the input flange. If the outers rotate opposite of each other, it is not Limited Slip. Hope that solves your issue.

bimmer.rob
06-27-2008, 11:24 PM
now heres a question.. would a diff off a e36 318 with 4.10 gears work? and what 318 would it have to be if it would fit?

bimmer.rob
06-27-2008, 11:24 PM
just trying to figure out what I can do with less then $350 :$

craz azn
06-27-2008, 11:27 PM
no e36 diff will fit. Unless if it is from a Ti. Save the 350$ for maintenance.

Eurostyle
06-28-2008, 12:16 AM
What year is the parts car? early 325e's came with a 2.79... somewhere in late 85, early 86 it was switched to a 2.93 to help acceleration a tad. If it is LSD, it will turn both output flanges the same way/rotation when you turn the input flange. If the outers rotate opposite of each other, it is not Limited Slip. Hope that solves your issue.

SO wrong on this one! If you turn the INPUT flange, on both LSD or OPEN, they will turn the same way....BUT if you turn ONE output flange (or wheel)on open diff, the other one will turn the opposit way! On the LSD the will turn the same way...Try it out, you'll be surprised what you can find out*th-up*

Eurostyle
06-28-2008, 09:00 AM
The only way you can have them turning the opposite way is if there is absolutly no traction on both wheels (car is off the ground!)...

T.Dot_E30
06-28-2008, 09:22 AM
SO wrong on this one! If you turn the INPUT flange, on both LSD or OPEN, they will turn the same way....BUT if you turn ONE output flange (or wheel)on open diff, the other one will turn the opposit way! On the LSD the will turn the same way...Try it out, you'll be surprised what you can find out*th-up*

I have an open diff with me right now, and it does what rudy said.

Eurostyle
06-28-2008, 06:41 PM
I have an open diff with me right now, and it does what rudy said.

Come and show me! Thats 110% WRONG! If you spin the input shaft (driveshat) BOTH wheels spin in the same direction if no load on them...Tryed, tested and can prove it anytime...
The only was you get them to spin opposite way is if you spin ONE wheel, then the other side spins against it (if open)...*th-up*

craz azn
06-29-2008, 11:37 PM
My junky open 3.73 diffy out back does more less what I said. Tryed it this afternoon. It was a bit hard to turn, I guess its about seized up (high mileage and sitting outside w/o seals and plugs since '04) the one side turned, the other stayed put. I could barely turn it, so I guess not a good example. Whatever, its a diff, and I'm not gonna fight on it/waste my time over it. That would be too childish. ;)

bimmer.rob
06-30-2008, 06:13 AM
So I can take a Ti diff from a e36 ? Because my diff and tranny are noisy so im trying to figure out what i can do...would the tranny of the 1987 e work? or the gears just way to low?

craz azn
06-30-2008, 07:56 PM
Yes the Ti diff should bolt right in. Everything should bolt up too. The 325e and 325I trannys have the same gear ratios so it be the same. As for the diff ratio of the Ti, I am not sure. Ask Eurostyle, he should know. I would guess it would be around 3.91 or something high-ish like that.

racer-x
07-12-2008, 11:17 PM
Get one from an auto 318ti..... 4.44..... woo-hooooooooooooo

Eurostyle
07-12-2008, 11:30 PM
Get one from an auto 318ti..... 4.44..... woo-hooooooooooooo

I drove an S52 swapped car with 4.44 (before new lower ratio diff was installed) and it's insane...wont go past 160Km/h, and it brakes loose in 3rd gear, goin 80...*shiner*:D

TopSpeed
07-12-2008, 11:56 PM
I have a 4.10 LSD if you're looking for something with that ratio. It's off a 160km 1991 318is

FuryriderX
07-14-2008, 04:52 PM
just to clear up any further misunderstanding:

LSD: turn one of the OUTPUT shafts, and the other output shaft turns the SAME WAY
OPEN: turn one of the OUTPUT shafts, and the other output shaft turns the OPPOSITE WAY

if the diff is old/semi-siezed, all bets are off though.

Eurostyle
07-21-2008, 01:51 AM
^^^I think the "misundertanding" is what happens when you turn the INPUT shaft!

propr'one
07-21-2008, 04:18 AM
^^lsd = both wheels spin (always)
open diff = both wheels sometimes spin, sometimes only 1. (only one wheel will have power, but sometimes the other wheel will still spin forward, just without any force.)