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Stacking pinion angle correction shims

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 88jimmy4x4, Nov 21, 2003.

  1. 88jimmy4x4

    88jimmy4x4 1/2 ton status

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    I need to add a 6 degree shim to my rear diff to correct the pinion angle. The leaf packs allready have a 3 degree shim. Are there any problems/dangers with stacking shims?

    I plan on doing this in a couple hours so please respond.
     
  2. Bullet

    Bullet 1/2 ton status

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    Nope. Don't do it, it'll spit out those shims quick
     
  3. 88jimmy4x4

    88jimmy4x4 1/2 ton status

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    Even if the center pin goes thru it?
     
  4. Bullet

    Bullet 1/2 ton status

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    Try and PM Laketex, he had stacked shims on his axles and I think one spat out, not sure If it was bolted though
     
  5. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Just buy a 9* shim and bolt it to the pack. Do not stack them or put them in loose.
     
  6. Blue85

    Blue85 Troll Premium Member

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    Don't yell at me, but I have actually done this successfully (so far?). The key is to put the spring pack center pin all the way through everything. You also need a flat spot on the bottom shim that is parallel to the leafs so that the bolt is pulling straight. As long as the U-bolts are tight (you should check them anyway, but that's another topic), the only way to lose one is to shear the center bolt. Since the same bolts are used for huge thick spring packs on 1-tons and such, this shouldn't be a problem.

    I agree that it is better to use a single degree shim, but it still should have the flat spot to avoid bending or stressing the bolt.

    Best yet is to move the spring perches or turn the tubes. However, that is pretty final, so I like to try out an angle with shims for a while to make sure its' right.
     
  7. 88jimmy4x4

    88jimmy4x4 1/2 ton status

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    Okay, they are all installed, stacked them and it worked fine so far. The pinion angle is now perfect. I dont see how it would be a problem stacking as long as the bolt goes thru both and also as stated, I got the flat shims.

    Side topic......Does anyone make custom rear blocks like a 2" with 13 degrees or whatever you specify?
    I really dont like the stacked shims and If I could getr a custom block made that would be great.
     
  8. SCJimmy

    SCJimmy 1/2 ton status

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    [ QUOTE ]

    Side topic......Does anyone make custom rear blocks like a 2" with 13 degrees or whatever you specify?
    I really dont like the stacked shims and If I could getr a custom block made that would be great.

    [/ QUOTE ]

    PM TonyP....

    He made me a 5* shim with 5/8 height to correct a spring perch problem I had. Excellent workmanship and very fast turn around. The tall shim he made for me had a threaded hole in the bottom(flat) side, into which he had inserted a locating pin. He drilled and tapped the remainder of the locating pin hole to match the angle of the top of the shim, and provided a allen head bolt so I could bolt it to my spring pack.

    The install was really good (front D60), and I have had no problems thus far.

    Byron
     
  9. 88jimmy4x4

    88jimmy4x4 1/2 ton status

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    Thank Byron /forums/images/graemlins/thumb.gif

    I will definately PM him.
     
  10. SCJimmy

    SCJimmy 1/2 ton status

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    /forums/images/graemlins/k5.gif /forums/images/graemlins/grin.gif
     
  11. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Az-Kickin' sell them, too. Link's at the top of every page on the garage.
     
  12. 88jimmy4x4

    88jimmy4x4 1/2 ton status

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    [ QUOTE ]
    Az-Kickin' sell them, too. Link's at the top of every page on the garage.

    [/ QUOTE ]

    I went to their website but they only go to 8 degrees /forums/images/graemlins/thinking.gif
     
  13. 45acp

    45acp 1/2 ton status

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    John, We also do custom machining if you want to give me a call with you requirements.
     

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