Gears to go with

Discussion in 'Got gears?' started by hgiljr, Sep 9, 2019.

  1. Steve73GS

    Steve73GS 73 GEE YES

    I run 295/65-15 with 3:73's and @ 65mph RPM's are about 2650. Taller tire is good option if running lower gears IMO...still plenty of grunt out of the hole.

  2. Bens99gtp

    Bens99gtp Well-Known Member

    Steve your tires are 30" tall too, and the formula I used shows your should be 2700ish so it does work out close in real world backing
  3. DasRottweiler

    DasRottweiler -BuickAddict-

  4. hgiljr

    hgiljr Well-Known Member

  5. Steve73GS

    Steve73GS 73 GEE YES

    Yep, the formula seems pretty much right on...Larry also plugged in the #'s a few weeks ago and came out with the same result.

  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Yes, 3.73's with a 30" tire makes your final gear 3.31. Use a 275/50-15 at the track (26")
  7. Steve73GS

    Steve73GS 73 GEE YES

    Any guess what the ET difference would be with 275/50-15 vs 295/65-15? Also wonder how the 275 vs 295 would hook, the 295's hook really well, at least with small sample on street so far since car is freshly done and I haven't/won't totally flog it on street.
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I hook with 275/60R-15 Mickey Thompsons Drag Radials. The shorter tire will let you RPM through the traps where you are making maximum HP.
  9. Steve73GS

    Steve73GS 73 GEE YES

    10/4. If you hook I'm sure I would too. Will probably use the 295's as a baseline and then change to the 275's + mount the 275's on lighter wheels to see the difference . I like the look of the 295/65's on the street.
  10. Gary Bohannon

    Gary Bohannon Well-Known Member

    How about a Coan 20320-2 4000 stall converter and a 3.08 gear and use 26" to 30" tires to fine tune the rpm range.

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