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Old 06-26-2008, 07:15 AM   #1
bimmer.rob
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325E and 325is

Hey guys, I was wanting to know could I use the diff off my 325e parts car on my 325is?
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Old 06-26-2008, 07:15 AM   #2
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oh and if so what would the gear ratios be?
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Old 06-26-2008, 08:09 AM   #3
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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.
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Old 06-26-2008, 11:09 AM   #4
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i have a 2.79 lsd... great on the highway came off an 85e
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Old 06-26-2008, 12:23 PM   #5
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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.
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Old 06-26-2008, 02:43 PM   #6
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bump
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Old 06-26-2008, 03:32 PM   #7
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go under, there's a tag on the diff that says the ratio. if there's an S next to the numbers, its LSD.
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Old 06-27-2008, 12:22 AM   #8
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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.
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Old 06-27-2008, 11:24 PM   #9
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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?
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Old 06-28-2008, 12:16 AM   #10
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Quote:
Originally Posted by craz azn View Post
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
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Old 06-28-2008, 09:00 AM   #11
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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!)...
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Old 06-28-2008, 09:22 AM   #12
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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
I have an open diff with me right now, and it does what rudy said.
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Old 06-28-2008, 06:41 PM   #13
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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)...
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Old 06-27-2008, 11:24 PM   #14
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just trying to figure out what I can do with less then $350 :$
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Old 06-27-2008, 11:27 PM   #15
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no e36 diff will fit. Unless if it is from a Ti. Save the 350$ for maintenance.
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