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Thread: Gear Ratio Advice or suggestions

  1. #1
    Join Date
    Aug 2010
    Location
    Asheboro ,NC
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    Gear Ratio Advice or suggestions

    My 06 Tahoe 4wd has a stock 5.3 with a nelson tune,and I want to change the gear ratio. I have 35-12.50 /22 tires.At 60 mph my rpm is at 1450, it has the stock 3.42 gears now and I was thinking about 4.56 or 4.88s.The 4.56 gear will be at 1850 rpm at 60, while the 4.88 will be at 1920 rpms.

    Any suggestions?

  2. #2
    Join Date
    May 2009
    Location
    Plainfield, IL
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    Do the rpm calculations for 80...not 60

    I have 35's on my truck now (bought gears when i was running 36's) and at 80, I was sitting at like 2800 RPM.

    I personally think 4.56 is perfect if you want performance gears. If you want something more realistic, somewhere between 4.10-4.56 (there is one in the middle, I can't remember what it is).

    With my 36's and 4.56 gears, I can still spin the tires pretty easily. Bigger tires don't do so well on traction
    blown transmissions are about as useful as 97% of the guys on this forum

  3. #3
    Join Date
    Mar 2007
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    Newark, Delaware
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    931
    4.88's would work well considering all the weight your trying to move.
    Big slow mud truck with a TUNE!!!!!!

  4. #4
    Join Date
    May 2008
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    Crowder, OK
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    8,005
    Quote Originally Posted by oleshifty View Post
    Do the rpm calculations for 80...not 60

    I have 35's on my truck now (bought gears when i was running 36's) and at 80, I was sitting at like 2800 RPM.

    I personally think 4.56 is perfect if you want performance gears. If you want something more realistic, somewhere between 4.10-4.56 (there is one in the middle, I can't remember what it is).

    With my 36's and 4.56 gears, I can still spin the tires pretty easily. Bigger tires don't do so well on traction
    4.30 is in the middle IIRC

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