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Thread: Differential replacing?

  1. #1
    Join Date
    Jan 2011
    Location
    San Diego, Ca
    Posts
    117
    My Cars
    1999 E36 M3 Coupe

    Differential replacing?

    I'am looking into changing out the diff. How can i find out what my gearing ratio is now? and what gearing ratio would improve my car?

  2. #2
    Join Date
    Mar 2012
    Location
    Hopewell Junction, NY
    Posts
    2,639
    My Cars
    1987 325iS...edan
    If your car is a manual, it has a 3.15 final drive ratio. If it's an automatic, it has a 3.91. What do you mean "improve?" For better acceleration and buzzier highway travel, you want a higher number. For better mileage and less "pep," you want a lower number. With a stock motor, you won't want to stray too far from the stock ratios.
    Interested in vintage cars? Ever thought about racing one?
    Info, photos, videos, and more can be found at www.michaelsvintageracing.com!


    Elva Courier build thread here!

  3. #3
    Join Date
    Jan 2007
    Location
    Nc
    Posts
    2,420
    My Cars
    Bmw
    Stay with the stock ratio unless you are running a LS1
    Life is like a car wash and I'm on a bicycle.

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