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Thread: 08 sierra 2500hd re-gearing

  1. #1
    Tuner in Training
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    Jun 2019
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    08 sierra 2500hd re-gearing

    wanting to change my gear ratio in my 08 sierra 2500hd 6.0 gas. it has the stock 3.73 and im running bigger tires 33" just wanting some opinions on 4.10 or 4.56 who has them and if the out come of re gearing was worth it. my truck is a dog and pulling my trailer with my jeep on it is even worse.

  2. #2
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
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    1,015
    with that tire i would go 4.56,
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  3. #3
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
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    13,533
    Yup, don't fear the gear.

    Go with 4.56's for sure, you have a 6 speed auto and it will love it.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  4. #4
    Tuner in Training
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    Jun 2019
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    18
    okay thanks guys. thats what ive been seeing on other forums of guys just going straight to the 4.56