3.42 or 3.73 ?

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

  1. vfitom2aol.com

    vfitom2aol.com Veteran Member

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    On my 70 to 74 Z28's with original, stock sized tires, with 3:73 gears, my speed was at 60MPH and taching at 3000 RPM.
     
  2. slayer74

    slayer74 Veteran Member

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    no offense to you rich,but jersey highways are down right dangerous,people drive like maniacs
     
  3. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    ^^as if NY is better! lol
     
  4. slayer74

    slayer74 Veteran Member

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    yup
     
  5. ULTM8Z

    ULTM8Z Veteran Member

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    Problem is you'll get rear ended doing "only" 60 on the highway.

    I'm routinely cruising 75+ just to keep up with the middle lanes. I could go in the left lane and do 80+, but I'm not in that big of a hurry...

    3.42's. Albeit with OD, but even around town the 3.42's are very nice.
     
  6. twozs

    twozs Veteran Member

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    Have you ever driven 684 or 84 . I got moms in mini vans passing me at 80 + mph . Its 4 wheel insanity . The taconic parkway is worse .
     
    Last edited: Aug 15, 2014
  7. Project-Z28

    Project-Z28 Member

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    I'm running a 255/60/15 in the back and a th350 . I put the 3.73 in tonight . Used the spacer out of my 2.52 and it's way to tight . Going to have to pull it apart again and remove the shim . 0 back lash ! Lol . Any good links to doing rear end shimming , I know very little about it . :(
     
  8. Dogwater

    Dogwater Veteran Member

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    Your going to need some shims for the carrier an for the pinon.You can order them or a auto parts might have a shim kit. If your in a hurry like I was I went to the local pick n pull an walked around looking for where other people pulled apart the rear ends an left the shims behind. Some were laying on the ground others still stuck to the axle. Ended up with about 12 carrier shims, pinon shims, didn't find to many of those. You'll need a dial caliper to measure thickness also. Out of the 12 one was perfect an another I had to flat sand about 2 thousands off of it.
     
  9. doublec

    doublec Veteran Member

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    if you have OD I would go 3.73 ( or a little deeper) all day long. I have 3.55's and just put a 700r4 in my car and wish I had more gear.
     
  10. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

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    I tend toward the 3.42s.

    I run 3.42s with 26" tires and a T56 with 0.5 6th gear. I loaf along at 1500rpm at 65mph.:)
     

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