1992 e36 325 coupe rear diff question

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  1. 1992 e36 325 coupe rear diff question 
    #1
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    hi there whats the ratio on my 325 coupe to the 320 diff and the 325 auto diff . what are all 3 ? my cousin used to have a 320 coupe and had an engine conversion to a 325 and it was dam rapid and we keep thinking it was the diff used to spin at the back when setting off . any ideas guys
     
     

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    325 is 3.15 medium case
    325 auto is 3.91 medium case
    320 is 3.45 small case
     
     

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    so the 320 is still fast enough than the one i have and whats the small case and medium case about lol
     
     

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    Quote Originally Posted by spartacus1 View Post
    so the 320 is still fast enough than the one i have and whats the small case and medium case about lol
    Size of the diff. You car will have a medium case diff. The prop output is different on a medium case to a small case.

    Also if you are going to rag it a small case won't last that long.

    And yes a 320 will improve acceleration with a knock on top speed and crusing revs will be higher.
     
     

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