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Thread: RING N PINION SIZE

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496

    RING N PINION SIZE

    THINKING ABOUT BACKHALFING MY CAR WHAT SIZE RING N PINION WOULD I NEED TO GET 4.56 GEAR RATIO WHEN USEING 32X14X15 WHEELS?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    orland pk il
    Posts
    2,429
    if your backhalfing I would go with ford 9 in. tire size & gear ratio are two separate things, you need to choose the combinationof the two to achive the the desired rpm best for your set up.

  3. #3
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496
    RIGHT NOW IM GOING THRU THE TRAP AT 7-7100 RPM,WOULD LIKE TO KEEP IT THAT WAY.9 INCH , DANA 60 OR MOSER M9 WHICH ONE IS LIGHTER.

  4. #4
    Senior Member MASTER BUILDER
    Join Date
    Sep 2005
    Posts
    134
    Old tire rollout divided by new tire rollout=x.Old gear ratio divided x= new gear ratio.Old tire 90 divided by new tire 102=.88 4.56 divided by .88 =5.18.Put your numbers in.Bill.


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