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4" Rancho Lift - Did I do it right (!! No, I Didnt'!)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 79Guy, Oct 5, 2000.

  1. 79Guy

    79Guy 1/2 ton status

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    4\" Rancho Lift - Did I do it right (!! No, I Didnt\'!)

    I've completed my 4" Rancho spring lift. I bought it "new" but previously owned, and it did not have instructions.

    The kit includes a wedge shaped shim, maybe 3/8" on the thick end, that apparently goes between the axle and the bottom of the springs. I'm not sure of the purpose, but I'm thinking I might have installed it wrong.

    For some reason, I assumed it was installed with the thin end forward, thick end to the rear.

    After thinking about it a week or so, I now wonder if it should have been fat end forward, thin end to the rear. This would rotate the axle a bit, and maybe make a little better drive-shaft angle.

    Anyone have any clue what I'm talking about? And know what the right answer is?

    Thanks,



    '79 Guy
    1 Blazer - 7 Children
    http://79guy.coloradok5.com
     
  2. Unholy_Advocate

    Unholy_Advocate Registered Member

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    Re: 4\" Rancho Lift - Did I do it right

    Don't worry. You did install it correctly. If you would have installed the shim in the reverse manner you would have severe problems with u-joint wear and tear and could possibly be replacing yokes and t-cases.

    There's no replacement for displacement.
     
  3. Rebel88

    Rebel88 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right

    Yeah that sounds about right. If you had put it differently it would tilt the axle down and would tear up some u-joints. How do you like it man? Is it what you expected?
    Congratulations.

    Later

    Have you driven OVER a Ford lately?
     
  4. EDdaTREE

    EDdaTREE 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right

    No... the thick end of the shim goes towards the front of the truck,this tilts your pinion angle up a few degrees and gives a better driveline angle to save wear and vibration on your u-joints. Trust me on this one...you'll be smokin' u-joints left and right. Same principle in the rear with shims or tapered lift blocks..thick side to the back to tilt the nose of the pinion up towards the t-case.
     
  5. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Re: 4\" Rancho Lift - Did I do it right

    The thin shim goes on the front axle and it goes thick to the front to tilt the pinion in line with the drive shaft.
    This is mostly needed in trucks that are still full time. Rancho put longer centering pins on the front springs and without the shim you cannot get the springs bolted down correctly without grinding the pin.

    Diging it in the dirt with my K5's
    Grim-Reaper
    http://grimsk5s.coloradok5.com/
     
  6. Zepplin

    Zepplin 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right

    Yeah that's right thick end goes towards the front of the truck. If not "snap-crackle-pop" with the u-joints.

    Dazed and Confused in a 74 Blazer

    Zeppelin
     
  7. Derf00

    Derf00 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right

    70Guy,

    I tend to agree with Grim, but have seen the shims used front or rear. The big question is which direction do they go. Front or rear, the thin side of the shim goes towards the transfer case, you are trying to "minimize," the angle between the drive shaft and the differential.
     
  8. Blue85

    Blue85 Troll Premium Member

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    Re: 4\" Rancho Lift - Did I do it right

    The real question is: do the shims go on the front axle or the rear axle? And which one did you put them on?

    Either way, the thin end will go towards the transfer case, like stated above, but you need to know which driveshaft is in need of this correction after the lift.

    '85 JIMMY
    '90 paint/grill/trim 5"susp 33/12.5/16.5
    Fresh 350 B&M '87 TH700
     
  9. 79Guy

    79Guy 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right

    Arrrgggh. Yup. I did them wrong.

    BTW, they were packaged w/ the front U-Bolts, so I assume they go w/ the Front Springs.

    As they are torked pretty tight, I assume I should use new nuts when I switch the shims. Can I reuse the U bolts, or do I need new ones of them, too?

    Thanks,

    Kim


    '79 Guy
    1 Blazer - 7 Children
    http://79guy.coloradok5.com
     
  10. ken

    ken 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right

    You don't need new nuts OR new u bolts. That's an "old wives tale". Loosen them up, switch the shims, and tighten er back up. It's not rocket science!!!

    ken
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: 4\" Rancho Lift - Did I do it right

    Just make sure you re-torque them after driving it a little. [​IMG]

    Rene

    [​IMG]
     
  12. MudFrog

    MudFrog 1/2 ton status

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    Re: 4\" Rancho Lift - Did I do it right (!! No, I Didnt\'!)

    Hey 79Guy,
    I wanna see some pics of that lift on your rig. I hope everything wen't smooth for you when you picked it up.

    89 K5 Silverado
    http://mudfrog.coloradok5.com
     

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