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

  1. #11
    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)

  2. #12
    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.

  3. #13
    Join Date
    Jul 2009
    Posts
    168
    I went from 3.42 to 3.90's and love them. But sometimes I still think I should have done 4.10's. Do at least 3.90's or stay lame at 3.42.
    2002 Under Construction Again!

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