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external overdrive

  1. Thomas Fournier

    Us gear vs gear vender overdrive units

    Ok I'm sure this has been on here before but there isn't very much info on this subject. I have a 77 chevy with a built 350 th400 np241 14bff rear dana 44 4.56 gears and a locker in the rear. I want some overdrive cause 3000rpm isn't fun at 65. I don't want to run. Crappy 700r4 cause I hate the...
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