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-   -   325E and 325is (http://www.maxbimmer.com/forums/showthread.php?t=107319)

bimmer.rob 06-26-2008 08:15 AM

325E and 325is
 
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 08:15 AM

oh and if so what would the gear ratios be?

FuryriderX 06-26-2008 09:09 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 12:09 PM

i have a 2.79 lsd... great on the highway came off an 85e

bimmer.rob 06-26-2008 01:23 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 03:43 PM

bump

FuryriderX 06-26-2008 04:32 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 01:22 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 06-28-2008 12:24 AM

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 06-28-2008 12:24 AM

just trying to figure out what I can do with less then $350 :$

craz azn 06-28-2008 12:27 AM

no e36 diff will fit. Unless if it is from a Ti. Save the 350$ for maintenance.

Eurostyle 06-28-2008 01:16 AM

Quote:

Originally Posted by craz azn (Post 1170721)
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 10:00 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 10:22 AM

Quote:

Originally Posted by Eurostyle (Post 1171138)
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 07:41 PM

Quote:

Originally Posted by T.Dot_E30 (Post 1171168)
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*


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