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Flipping rear springs

Discussion in '40- & 55-Series Tech' started by cajunfj40, Mar 24, 2004.

  1. cajunfj40

    cajunfj40

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    I saw in another post that flipping the rear springs gains four inches of wheelbase.
    Waht are the draw backs of this?
     
  2. woody

    woody unhelpful spotter Staff Member Admin

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    3.5"

    BAD: Increases any axle wrap problems you may have now, IMO, a wrap-bar is required even if still SUA. Can cause minor geometry issues with driveshaft vibrations. Will require minor brake line adjustments, relocating shock mounts. Odd are you get to trim your wheelwells out a fair amount, requires lengthening the rear driveshaft.

    GOOD: Provides added clearance at the tub for 35+ tires, longer wheelbase is better for hillclimbs, gives you a good excuse to find some 55/60 rear packs and swap them in.

    When I had rear leaves, mine were flipped, and I loved it. Only cost me 1 pinion when my 1st generation (and poorly design) wrap bar snapped...lol
     
  3. cajunfj40

    cajunfj40

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    Would custom driveshaft eliminate vibration?
    Even if not it sounds good.
     
  4. woody

    woody unhelpful spotter Staff Member Admin

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    proper axle shimming will eliminate vibration....http://www.4xshaft.com has nice tech pics so it makes sense. In short, the down face angle of the t-case output must match the up face angle of the pinion input.

    No custom shaft required, just retube. Custom is no better than stock, unless you dump LOTS of money into some funky stuff.
     
  5. cajunfj40

    cajunfj40

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    Thanks for the info. Sounds cheap. Greasy, but cheap.
     
  6. hammerhead

    hammerhead

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    Spring flipped a 40 the other day in less than 2 hours including body work. It really is that easy. Good mod too. Like Woody said you'll need a traction bar to control the wrap.
     
  7. HI^C

    HI^C

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    what is the word on redrilling military wrap leaf to keep it in the front?

    how much change in pinion angle if any?
     
  8. Herky

    Herky

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    Doesn't flipping the springs make the wheels sit more centerd in the wheel wells?
     
  9. big mike

    big mike

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    I've been wondering the same thing as Hercdriver... my tires sit way forward in the wells. Don't want this when I install my BDS next month!
     
  10. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    [quote author=HI^C link=board=1;threadid=13655;start=msg126758#msg126758 date=1080201319]
    what is the word on redrilling military wrap leaf to keep it in the front?

    how much change in pinion angle if any?
    [/quote]

    IMHO redrilling the military wrap to keep it on the spring mount instead of the shackle mount is absolutely necessary..

    It is not safe otherwise..