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Rear Pinion Angle ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Zepplin, Oct 31, 2000.

  1. Zepplin

    Zepplin 1/2 ton status

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    I already have Skyjacker rear 6" springs and plan to use it with the rear 4" shackle flip. Will the shim from the rear springs be enough or will I have to install a larger degree shim?

    Dazed and Confused in a 74 Blazer

    Zeppelin
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Are you saying that you're going to have 10" of lift? Are you going to use a CV driveshaft on the rear? I would think the shackle flip would help tip the pinion up a bit, but I guess it also depends on the arc of the springs at the pad.

    Rene

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  3. Zepplin

    Zepplin 1/2 ton status

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    Yes, it will have a 10" lift I have a set of 38.5 TSL, as well as a 14 ff rear that I have from a previous truck. I do plan on using a CV driveshaft though. So, the shim that came with the rear 6" springs should be enough with the shackle flip?

    Dazed and Confused in a 74 Blazer

    Zeppelin
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well I could be wrong but I've heard that with a CV driveshaft the pinion should point directly at the transfer case, so there is a 0 degree operating angle at the diff. I would probably angle the diff down a bit from that, to compensate for movement on acceleration. So I don't know if the shim you got will be enough. Is it a 4 degree shim? I'm currently using a 4 degree shim with a 4" lift and a regular driveshaft. I should probably have only a 2 1/2 degree shim but I don't have any bad vibes and my U-joints seem to last so what the hell. Anyways with the 4 degree shim I have my diff is almost pointing at the T-case.

    Rene

    [​IMG]
     
  5. Zepplin

    Zepplin 1/2 ton status

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    Thanks, I believe it to be a 3 degree shim so I may need another degree or too. Thanks again.

    Dazed and Confused in a 74 Blazer

    Zeppelin
     

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