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Old 03-22-2011, 02:03 AM   #1
dylanreid16
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Default e30 3.91 small case LSD $300

Hey guys i'm selling a 3.91 LSD from an 1989 318i 5 speed with 131k miles. Oil was very clean,had no metal debris, and Very smooth turning with no noise. $300 or I will trade for a medium case 4.10LSD.
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Old 03-22-2011, 02:35 AM   #2
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this will fit the ti.. right? dont you need different half shafts and shim the abs sensor and such?
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Old 03-22-2011, 03:07 AM   #3
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small case will bolt right in, medium case needs halfshafts and shims.
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Old 03-22-2011, 03:12 AM   #4
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ok, this makes me interested. im gonna eventually put a s52 in. wouldnt i need a medium case for that?
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Old 03-22-2011, 03:22 AM   #5
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Any e30 diff will fit the 318ti because the rear subframe is the same. If you get a medium case diff you will need to get e30 half shafts and shim the abs sensors but with the 3.91 small case you should be able to use the stock half shafts and such.

Here is a link to a thread on bimmerforums that mentions the 3.91 small case bolting right in, there is more info out there too if you look. http://forums.bimmerforums.com/forum....php?t=1369794
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Old 03-22-2011, 03:32 AM   #6
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Yeah I'm selling it because I just got an s52, small case diffs only have one clutch compared to medium which have two. The small case diffs can't handle the torque of any six cylinder so you will need a medium case if you are getting an s52.
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Old 03-22-2011, 03:45 AM   #7
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Thanks guys. I'm still interested though, i plan on getting the s52 in for senior year of high school if my grades are good. But i don't know if I can deal with an open dif for another year and a half. Lol


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Old 03-22-2011, 09:52 PM   #8
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haha yeah, I bought the 3.91 because I wanted to get the absolute most out of the m44 without getting a 4.10lsd. You don't have to sacrifice as much high rpms on the highway compared to the 4.10 and the 3.91 is certainly a lot faster than the stock 3.45.
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Old 03-23-2011, 03:29 AM   #9
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How does the 3.91 effect your rpm's at cruising speed?
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Old 03-24-2011, 01:18 PM   #10
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How far into mass are you located
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Old 03-24-2011, 02:03 PM   #11
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I'm in Marlboro, right by Framingham.
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Old 04-02-2011, 11:47 PM   #12
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So this direct fits the axles and everything? But wasnt from a ti? I'm highly interested but I want the least complicated swap, their argument on that post confused me. I'm willing to drive 3 hrs to get this
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Old 04-04-2011, 11:21 PM   #13
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Pm'ed


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