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rear shaft slip travel?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K5Chris, Nov 21, 2005.

  1. K5Chris

    K5Chris 1/2 ton status

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    how much travel does your aftermarket rear shaft have? is about 3-4" enough? im doing the diy4x flip w/ 6" shackles and 56's, and move the axle back an inch or so. just doesnt seem like thats enough.
     
    Last edited: Nov 27, 2005
  2. K5Chris

    K5Chris 1/2 ton status

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    anyone? :confused:
     
  3. Blue85

    Blue85 Troll Premium Member

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    Standard shafts don't usually have more than 2.5-3" of slip in them. Is that enough? Well figuring that out is part of building a custom suspension.

    Simple trigonometry is all that's needed to figure out how long your shaft should be at stuff, droop, etc. The amount of slip needed is proportional to the amount of suspension travel available. The problem is that adding lift doesn't mean that a longer driveshaft with the same amout of slip will work. Unless you space down the bump stops or limit the stuff somehow, the minimum driveshaft length is the same as stock.

    You pretty much have to design it for full compression, so that you don't bottom out the driveshaft into the T-case on stuff. Then you put in as much slip length as you can afford. It's OK to overextend a little and booger up the seal, as long as you still have enough spline engagement that it doesn't come apart or bend the splines.

    As for moving the axle backwards, that should translate directly to a longer length needed.
     
  4. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Now theres an oxymoron.... :rolleyes:
    -Harrison
     
  5. drivelineman

    drivelineman 1/2 ton status

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    In most cases a 5 1/2 " slip is what they come with (thet's full one end to the other slip -until it pulls appart) and if you run it between 2-2 1/2 " off bottom it sould not pull apart -its a centered axle- they don't pull away like a off-set front does- Jess
     

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