E36 325i final drive

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  1. E36 325i final drive 
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    I was wondering if it's possible to change the final drive without worrying about the diff and other stuff.
    Also which f/d would you recommend?
     
     

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    The final drive IS the diff, and there isn't many other options available.
    You'll have a 3.15 ratio, same as the 3.0 M3.
    The next closest would be the 3.23 from the M3 3.2, but that would need the complete rear axle swapped, and a custom prop (or swap the gearbox to a ZF from a 328)
     
     

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    The final drive isn't necessarily the whole diff. You can swap the crown wheel and pinion from any same sized diff.

    I've got a 4.10 from the states to go in mine. Any 188mm crown and pinion can be fitted to the "medium" sized diff.

    Bear in mind altering the final drive ratio will have an effect on your top speed gearing. The 4.10 diff I have limits a top speed of around 115mph with the standard rev limit. Remapped to 7200 rpm, ~135 should be possible.
     
     

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    Quote Originally Posted by Mark_F View Post
    The 4.10 diff I have limits a top speed of around 115mph with the standard rev limit. Remapped to 7200 rpm, ~135 should be possible.
    Thanks Mark, but 4.10 is abit too extreme for me, ive seen 3.91 ratio also from the states, what you reckon the top speed will be on that? (Roughly)

    Cheers
     
     

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    Also what is the standard ratio on a 325i on a 1995 M plate?
     
     

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    Quote Originally Posted by Mark_F View Post
    The final drive isn't necessarily the whole diff. You can swap the crown wheel and pinion from any same sized diff.
    True, but not many people would know how to shim it or use a DTI gauge to adjust the backlash, meaning that in most cases it isn't practicable and swapping the diff is the cheapest option.


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    Quote Originally Posted by nav_uk View Post
    Also what is the standard ratio on a 325i on a 1995 M plate?
    That's in the first reply from THE End


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    Quote Originally Posted by E36Coupe328 View Post
    That's in the first reply from THE End
    (You'll have a 3.15 ratio)

    Got you!!
     
     

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    Quote Originally Posted by E36Coupe328 View Post
    True, but not many people would know how to shim it or use a DTI gauge to adjust the backlash, meaning that in most cases it isn't practicable and swapping the diff is the cheapest option.
    Good post. I completely agree that the CWP swap isn't for the feint hearted, its almost certain that the contact pattern will not match the old setup without adjusting the shims, but I just wanted to make him aware that it doesn't need to be an entire diff swap - its a risk changing from a known good diff to an unknown, especially if you can't do the swap yourself and you're paying by the hour.

    4.10 is extreme for the road I think, I had originally looked at 3.91 as you say, but I can count on one hand the amount of times I've seen more than 130mph in the past few years...

    As far as I can remember, 3.91 with 17 inch wheels will turn 127mph. - Google a final drive calculator though to confirm.
     
     

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    Quick calculation;


    Tyre size: 235/40/17
    5th gear ratio 1:1 (double check this, it may not be the same on the 325)
    3.91 final drive
    6500 rev limit
    Top speed 119mph.
     
     

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