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Optimum Drive Line Angle?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by jimmyjack, Jun 29, 2001.

  1. jimmyjack

    jimmyjack 1/2 ton status

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    Optimum? Optimum????? Sounds weird. After i did my shackle flip I noticed that the drive shaft is in almost perfect alignment with the differential. The yoke going into the t case is at a different angle. Not severe but they are supposed to be equal, right? I was told its best to have the rear angle down a bit so when the shaft spins it allows the diff to torque upward. Ive also heard the opposite. Can you help me out?

    "My blazer may be slow, but it goes faster at higher speeds"

    Jim
     
  2. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Your pinion and tcase should be within 2 degrees of each other for non CV shafts.

    Steve

    Bandwidth FREE ZONE

    Mall-Running poseur 4x4 with curb-feelers
     
  3. jimmyjack

    jimmyjack 1/2 ton status

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    So, would it be more "optimal" to shim the rear end or the t- case? I'm really tired of cranking u bolts!!

    "My blazer may be slow, but it goes faster at higher speeds"

    Jim
     
  4. Boss

    Boss 1/2 ton status Author

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    If you haven't lowered the tcase yet, do it. If already then, shim the axle.
    Boss

    89' 1 TON of FUN K5
     
  5. Twiz

    Twiz 1/2 ton status

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    What steve said is the acual factory spec and should be followed as closely as possible for optimum u-joint life and to reduce vibrations. There is also a maximum operating angle, but I can't remember what it is right now.

    Shiming the pinion angle down a bit more than the t-case is also a good idea. As the axle houseing rotates and pinoion tries to clime the ring gear, the u-joint angle will also change. So shiming the pinion down -1 deg or so- will bring it back into line as load is applied to the gears.

    Shim what ever you need to to get the angles right. Probably lower the T-case first then match the pinion U-joint to that. Kinda sixes though. Eather way you go will probably end up at the same place.

    We've been fighting u-joint angles alot at the dealership with lifted silverados, they have a vibration off the line. We have been installing lift kits at the dealer on brand new Silverados, and they sell -fast! - Hint G.M.!

    Twiztid
     
  6. jimmyjack

    jimmyjack 1/2 ton status

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    The t case is lowered, I will shim the pinion and see what happens. My u joint is a little shaky, nothing major. It vibrates more at 45 than it does at 75. I had my rear tires rebalanced and had 4 oz removed!!!!!!! Hopefully shims and a u joint will fix it up.

    "My blazer may be slow, but it goes faster at higher speeds"
    <A target="_blank" HREF=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</A>
    Jim
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Get a CV shaft! End your problems. If I go up any more with my truck, I'm getting one too. Mine is a shortbox, so my wheelbase is about 11 inches longer, but I still need it.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     

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