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right gear for 39.5x15 super swampers

Discussion in 'GM Powertrain' started by redneckarmyMP, Jan 29, 2011.

  1. redneckarmyMP

    redneckarmyMP Epic Member 5+ Years 500 Posts

    I think ive decided to put the D60 rear end from my old F250 under the K5. It currently has 4.56 gears but I dont know if thats big enough to handle my 39.5x15 tires.anybody got any input on this?
  2. stephan

    stephan Rockstar 4 Years 5000 Posts

    Dylan, your 39.5" tires are off the scale on my slide rule, but with 4:56 gears at 3,000 RPMs you'd be doing 80MPH in a 1 to 1 ratio high gear (no overdrive gear involved)
    Is that what you're looking for?

    2670 RPMs @ 70MPH
    2250 RPMs @ 60MPH
    Last edited: Jan 29, 2011
  3. redneckarmyMP

    redneckarmyMP Epic Member 5+ Years 500 Posts

    Im honestly too scared to take that thing over 50mph haha Im just wanting a gear thatll be stronger enough to hold together while im playing in the mud and be able to move that huge truck the easiest

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