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  1. #1
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default right gear for 39.5x15 super swampers

    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?
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  2. #2
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,610
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    Default

    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?

    **also
    2670 RPMs @ 70MPH
    2250 RPMs @ 60MPH
    Last edited by stephan; 01-29-2011 at 04:08 AM.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  3. #3
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default

    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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