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Thread: 3.42 or 3.73 gears? This is my question.

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  1. #1
    Join Date
    Jan 2008
    Posts
    8,031
    i ran them 3.73s with 29'' tall wheel/tire

    i currently run 323s with the 6speed 29'' tire as well

  2. #2
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    I don't think it's worth the swap, id go 4.10's.

  3. #3
    Join Date
    Dec 2007
    Location
    Ponca City
    Posts
    1,606
    ran 4.56 and i dont think it fell on its face till 4th but that was 130 mph. do atleast 4.10s
    Slowest in Oklahoma...

  4. #4
    Join Date
    Nov 2008
    Location
    Paris, Texas
    Posts
    1,732
    think about this, how often do you plan on running all out, if alot stick with 3.42's.
    if your running racing or towing, lower gears are a must, then go 4.10 or lower.
    if you want to dial in your mileage, get on a rpm calculator and find the closest gear ratio: http://www.csgnetwork.com/multirpmcalc.html

  5. #5
    Join Date
    Mar 2009
    Location
    Lubbock,Tx.
    Posts
    23
    Yeah i dont plan on running all out that much, mainly just quarter mile, racing from red light to red light and flooring it on the highway to 100 or so.

  6. #6
    Join Date
    Aug 2008
    Location
    mansfield texas
    Posts
    3,512
    3.90s!!! Or 4.10s they say you can do 140ish in 3rd on 4.10s in my truck I shift to 4th usually so dunno how tall 3rd is exactly on a 29" tire as well...
    Im at a high rpm on the hwy but not to bad...

  7. #7
    Join Date
    Oct 2011
    Location
    Fayetteville , NC
    Posts
    163
    I have the 3.73 with 30 in tires great gear compared to my brothers 3.42. I'm currently having them swapped to 3.90 and going to a 31 in tire for the street and 28 in for the track. In relation to the 30 in tire with the 31 in the 3.90 should be the same rpm/mph as a 3.73 and the 28 in should be the same rpm/mph as a 4.10. Go with the 3.90
    '02 GMC RCStepSide 4.8 , Thumpr Cam , 3200 Stall , OBX LTs , MSD Wires , TrueTrac , 4.10s , 3/5 Drop , bolt in traction bars by LSX Powersports , EFI Live tune by LSX Powersports

    15.2 @ 90 , 2.3 60' (Only mods at this time , LTs)

  8. #8
    Join Date
    Mar 2009
    Location
    Lubbock,Tx.
    Posts
    23
    Yeah i mean it gets up and goes great with the 3.42's, so i will stick with goin to 3.73's and 28" tire for now. I mean damn 4.10s or lower i will probly end up pooing on myself.

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