325 diff to lsd conversion

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  1. 325 diff to lsd conversion 
    #1
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    hello all,
    just need some help regarding diff converson, got 325i need to change to 3.0 m3 evo lsd, will it be possible.cheers
     
     

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    the 3.0 M3 and the M3 EVO use different engines (the EVO is a 3.2) and different LSDs
    if youre going to swap to the EVO LSD you will need the diff carrier too
    the EVO is the only version of the E36 to use a "large case" differential

    you will also need to swap the input flange, which will require torqued to the correct setting so the preload is set correctly on the input shaft bearings, if you dont get the preload set correctly then the bearings will fail pretty quickly
    you will also need to swap the output couplings but that isnt hard the old ones just pull out usually with a bit of persuasion

    The 3.0 LSD is a medium case LSD so it will fit into the non M diff carrier
    the same applies for the input flange setup and the output couplings
    loud-low-slow-project


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    input flange should be fine for swapping in a 3L diff. I've only seen one type on the e36 med cases. Most of the time the outputs are fine as well. It's easy
     
     

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    E36 328 LSD is same as 3.0 M3 one bu usually cheaper due to not having M3 premium in adds.


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    Quote Originally Posted by E36Coupe328 View Post
    E36 328 LSD is same as 3.0 M3 one bu usually cheaper due to not having M3 premium in adds.
    Its not strictly the same as the 328 diff final drive is 2.93 and the M3 is 3.15. The input flanges are different too.

    Disco's post has covered the lot tbh.
     
     

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    Sorry to jump in and thread jack, but I've got a 323 and was thinking of putting an M3 3.23 LSD on. Is it a similar swap to the 325? And what type of performance shall I expect from the swap?

    Cheers guys!
     
     

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    Quote Originally Posted by Mark_F View Post
    Its not strictly the same as the 328 diff final drive is 2.93 and the M3 is 3.15. The input flanges are different too.

    Disco's post has covered the lot tbh.

    So do you mean the 328 flanges and imput shaft are different to the M3? in which case maybe an easier fit, at least if no re-torguing of the imput flange?

    About 7% ower gearing on the 3.15 means about 2.5% better acceleration, all other things being equal


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    Quote Originally Posted by Beej View Post
    Sorry to jump in and thread jack, but I've got a 323 and was thinking of putting an M3 3.23 LSD on. Is it a similar swap to the 325? And what type of performance shall I expect from the swap?

    Cheers guys!
    the M3 EVO LSD is 3.23 so you will need the differential carrier to go with it
    im not sure how it would work out as it is a slightly shorter ratio but the EVO uses a large case (210mm ring gear) differential compared to your 2.93 medium case (188mm) diff
    use this gear speed calculator to work out your to end etc
    http://www.endtuning.com/gearratios.html

    Quote Originally Posted by E36Coupe328 View Post
    So do you mean the 328 flanges and imput shaft are different to the M3? in which case maybe an easier fit, at least if no re-torguing of the imput flange?

    About 7% ower gearing on the 3.15 means about 2.5% better acceleration, all other things being equal
    i believe the 328i uses a 4 bolt input flange where as the M3 uses a 6 bolt input so this will need to be changed
    there are 2 different sizes of output shaft for the medium case diffs, so depending on which driveshafts are fitted will determine what output shaft is requiried
    loud-low-slow-project


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    i believe the 328i uses a 4 bolt input flange[/QUOTE]

    What does the 325 use?


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    Quote Originally Posted by E36Coupe328 View Post
    i believe the 328i uses a 4 bolt input flange
    What does the 325 use?
    Anything non M is 4.
     
     

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