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Thread: rear end swap

  1. #1

    Default rear end swap

    Hello. I'm swapping a 12 bolt into my 98 short bed. The spring perches have got me confused on the 98. They sit up higher the one on the 12 bolt. Will this matter. I will be replacing them with some off of summit the are just flat. They don't sit up. I can get pic if needed. Will it effect anything like the degree at which the rear will sit when I lower it on to install?

  2. #2

    Default

    Depending on how much higher. You may need to address your driveline angle, or may have to get an sye. I don't think you will tho. You also will prolly need a rear axle shim set in the 2-3 degree range, depending. Measure your stock angle of the rear end and if it changes with the swap go from there.
    1998 K1500 Extended Cab Short Bed.
    Z71-HD Chassis-Locker-3.73s-Skid Plates-3rd Door-Transmission Cooler-Tow Package-5.7L

    Oh, you hate your job? Why didn't you say so? There's a support group for that; it's called EVERYBODY. They meet at the local bar.

  3. #3

    Default

    I figured the height difference would be a issue on the angle. I've tried to find some wright ups on figuring out how to set the angle on the perches but I can't find on. Anyone know of any?

  4. #4

    Default

    That's what the shims are for. they come in different degrees. what's the difference in height of the spring perches from one axle to another? You can really eye it, the most you'd have to change the pinoin angle is like 1* on 1-3 inches. At the most. one inch wouldn't affect anything. imho. I've built many jeeps, it's the exact same. I actually lifted an xj 4.5 inches and didn't need an sye or any shims and it was fine.

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