Drive line slop

Discussion in 'Trucks and Trailers' started by MTCK, Mar 6, 2001.

  1. MTCK

    MTCK LawnSite Senior Member
    from Idaho
    Posts: 254

    I was under my truck today, looking at the starter, and noticed that my front drive line has a bit of slop in it. it has a constant velocity joint (2 u-joints together) at the transfer case end, a regular U joint at the front axel, and a slip yoke in the middle. I can get about a half inch of deflection at the slip yoke. Should I get ready to buy another one of these damn things? I've put 3 of them on my truck in the past 5 years. This is the first time it's been the slip yoke that has been questionable though. Always the CV joint before. Oh, by the way, it's a 83 1/2 ton with about 3" lift. Thanks guys.
     
  2. 75

    75 LawnSite Senior Member
    Posts: 992

    I'm not much of a "four by" expert by any means, but 1/2" of deflection in the slip yoke sounds like quite a bit. Replacing it sounds like a good idea - I'm wondering if the 3" of lift is causing driveline parts to wear faster than usual?
     
  3. MTCK

    MTCK LawnSite Senior Member
    from Idaho
    Posts: 254

    Yeah, I think the lift deffinetly contributes to the wearing of the parts, as well as the big tires. The angle of the driveline is more extreme since the truck is lifted. I've thought about having a driveline made with straight U-joints on both ends and a slip yoke in the middle instead of the CV at one end, since I keep blowing that part up. I've read that CV joints are better for a steep angle though. Another idea is dropping the transfer case an inch or so. Input?
     
  4. 75

    75 LawnSite Senior Member
    Posts: 992

    I don't know how feasible dropping the transfer case will be, since engine/transmission/transfer case are bolted together as a unit. I think it would be a l-o-t of work!

    Another option is tilting your axles slightly to help reduce the angle the U-joints are on. I've heard of this being done, but am not sure of the procedure.
     
  5. STUMP JUMPER

    STUMP JUMPER LawnSite Member
    Posts: 18

    I just had my front end angled to solve that very wear problem. All they do is put a tapered shim under the springs, kind of like a tapered lift block in the rear, but it doesn't affect the height or handling. So far so good

    STUMPJUMPER
     
  6. Alan

    Alan Member
    Posts: 1,185

    But it sure does affect the angles on your steering goemetry. Did you have caster and camber checked after the shims were installed? Both will be affected by changing the angle of the housing.
     
  7. STUMP JUMPER

    STUMP JUMPER LawnSite Member
    Posts: 18

    Yes I did Alan, it was all part of the job it ran me about $100 for the job and alignment. Drives great now.

    Thanks for the concern,
    STUMPJUMPER
     

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