3.42 or 3.73 ?

Discussion in 'Transmission & Driveline Topics' started by Project-Z28, Aug 14, 2014.

  1. Coadster32

    Coadster32 Veteran Member Lifetime Gold Member

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    That's put-put rpm for sure. Must get 20mph on the highway.

    Glad you went with the 3:73's. I think you'll be happier, and definatly notice a performance difference.:cool:
     
  2. Project-Z28

    Project-Z28 Member

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    Dog water I'm ahead of the game on that . Bought a shim kit already just it starts with the pulling it apart to figure out what shims need to go where .

    Coadster I think I will like the 3.73 gears the 3.42 didn't work out for me after . When buddy dropped of the carrier the crown had some chips gone out of it is I tossed them .
     
  3. slayer74

    slayer74 Veteran Member

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    how are 3:42s with a th350? i currently have 3:90s and am at 3500rpm at 65mph on the highway with a 26" tall tire,i like them on the street(3:90s) but do love a nice long cruise on summer days and am thinking of switching over the winter any info is greatly appreciated thanks
     
  4. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

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    Well that greatly simplifies the decision process.:)
    I get 23-25mpg highway, depending where and how far I'm going. That's running 70-75mph most of the time.
     
  5. Orange71

    Orange71 Veteran Member Lifetime Gold Member

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    It really depends on a lot of factors. For me it's no daily driving, very little highway driving, big 28"rear tires, big cam, and no overdrive.
    3.73's and sometimes wish I had 4.10's. 60-65mph in the 2800-3000rpm range - right where the motor likes to be
     
  6. doublec

    doublec Veteran Member

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    I hear ya on the 4.10's George!..now that i have the 700r4 I could see a set of 4.10s for myself.
     
  7. slayer74

    slayer74 Veteran Member

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    same here man,its almost embarrassing little old laddies flying by,havent been on 84 but 684 is a fast driving dream,long mostly straight flat and the road is in good shape compared to some others,this is why i'm thinking of switching from 3:90s to 3:42s not for the speed but more for nice long drives and being able to keep up with traffic
     

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