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Thread: 3.42 to 3.73 gear swap 2003 silverado

  1. #1
    Potential Tuner
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    Mar 2024
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    3.42 to 3.73 gear swap 2003 silverado

    Swapping my 3.42 rearend for a 3.73 rearend what all do I need to change in my tune? Truck is a 2003 with 5.3 and 4l60e

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Change the gear ratio in the gear/tire wizard under the edit tab, check the box to auto scale the transmission settings and that is 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.

  3. #3
    Potential Tuner
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    Mar 2024
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    Thank you