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U-joint angle

Discussion in 'The Garage' started by btolenti, Oct 14, 2003.

  1. btolenti

    btolenti 1/2 ton status

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    I just got done with installing my 6" tuff country lift and 14 bolt rear end. I measured driveline angles and came up with this.
    Transfer case = angles down at 6.5 degrees
    14 bolt pinion = angles up at 7 degrees
    Slope of driveshaft = 23 degrees

    Doing the math it looks like my u-joints will be operating at 16 and 17 degrees respectively. Will a stock 10 bolt u joint and napa 447 crossover U joint run at these angles?
    The pinion/transfer case seem to be fine, but I am worried about how long the u-joints would last at these angles.

    /forums/images/graemlins/1zhelp.gifThanks.
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I am pretty sure a 1310 will be fine at those angles without binding. Install it and find out, you can always clearance grind your yokes later.
     
  3. btolenti

    btolenti 1/2 ton status

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    I am not so much worried about bind as much as I am worried about decreased life. Would switching to 1350 u-joints all around be good or can I stay with the stock 10 bolt joints and napa 447?
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    If you're worried about decreased life, don't lift your truck. U joints wear. They wear MUCH faster when operated at that kind of angle.

    I replace my joints quite often. Many times, before they're even needed. U joints are cheap.
     
  5. btolenti

    btolenti 1/2 ton status

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    Well duh...

    I expect shorter life from U-joints when operated at this angle. I just want to make sure I am not replacing them every 500 miles...
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Nah it won't be that bad. They just won't last 20 years like the stock ones probably did. You'll have to replace them once a year or so depending on how much you drive.
     
  7. btolenti

    btolenti 1/2 ton status

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    ok, thanks.

    Do you know if switching to 1350 u-joints would be better?
     
  8. btolenti

    btolenti 1/2 ton status

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    TTT /forums/images/graemlins/ears.gif
     
  9. 84_Chevy_K10

    84_Chevy_K10 Banned

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    1350 joints will probably wear out just as fast as 1310, but, at the increased operating angle, the u joints get weaker, so I would consider that in your choice of joints.
     
  10. RustBuket

    RustBuket 1/2 ton status

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    Depending how hard you wheel and also, do you want the u joints to be your weak link? If you move up to a a bigger u joint maybe the tranny is next?
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    It doesn't really work that way.
     
  12. RustBuket

    RustBuket 1/2 ton status

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    Why not? I dunno, I was just spittin out random bits of nothingness.
     

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