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Thread: m5 diff in a standard 525i?

  1. #1
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    Jul 2006
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    croatia, zagreb
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    Default m5 diff in a standard 525i?

    can it fit?

    my 525i has 6 bolts on each shaft for the differential. the m5 diff i can get also has same shaft heads, the only potential problem is the diff housing. does it fit?

    thanks

  2. #2
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    East Brunswick, New Jersey
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    Someone took the engine and gave you the left-over?
    '01 540it, 6/01
    '03 325i 5 speed, 9/02
    '10 535ix. 9/09
    '10 mini 6 speed
    '15 mini countryman 6 speed

  3. #3
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    woudnlt it make ur 525i slower off the line? the M5 has 310hp your car is rated at like 190. M5s dont need super high gears to get going.

    also no, the M5 is a large case diff.
    Mark

    1999 M3 Cosmos Black/ Black 78k
    1994 540i Oxford Green/ Silver Grey Sold @ 133k
    1995 M3 Arctic Silver/Black Sold @ 117k
    1990 325i Zinnobar Red/Black Sold @ 115k

  4. #4
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    New Forest, ,UK,
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    The M5(E34) uses an adapted E38 diff, if you have welding facilities it will fit but allow 14 hrs labour,the ratio will not help you.The only advantage is theZF plate diff which can be tightened up with Bellville washers. Forget it, find an E30 M3 diff, three belleville washers from a ford "Atlas" diff, change ratios and you have a better set up, mine clanks at slow speed on corners but got me home when I forgot to finally tighten the drive shaft bolts which broke.Doh.

  5. #5
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    well....what makes the car move is the diff along with the gear ratios. so if i calculated properly, it would decrease my max speed, but make my car faster form the line.

    my neighbour bought one m5 a few years ago for parts, and he still has the extra diff, and i MUST have an LSD

  6. #6
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    I thought the m5 did use a lowish ratio....3.9??
    Gone but not forgotten

  7. #7
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    Reading, UK
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    Quote Originally Posted by Paul in NZ
    I thought the m5 did use a lowish ratio....3.9??
    Diff Chart
    EDIT: Anyone want a 2.64? I'd love to put something like a 3.46 in from a 525i and see what it does with all that torque.
    Last edited by Ferret; 07-16-2007 at 05:00 AM.

  8. #8
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    you will be topped out at 100mph
    Gone but not forgotten

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