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  • AMC 20 Perches

    hey everybody,

    im working on my cj and ive got to move my spring perches on my amc 20 due to a 4 inch suspension lift. Who has done this and just how much do i have to turn them back to get the driveline angle that isnt going to eat U joints and pinion seals. Is it like a look at it and turnit and look at it kinda thing or does someone has a good approximation as to hpw far they have to be moved. Thanks yall!!

  • #2
    It's a measure angles thing. I put a CV shaft on my 77 CJ7 with a Dana 20 transfer case and a AMC 20 rear and I would say they turned it up about 8 degree's (4wd sells a 6 deg shim and their kits come with a 4 deg shim on 4" lift) from stock. Rewelding is the way to go....saves hunting down a longer spring bolt (the one in the center of the spring pack that lines up with the axle perch) But with a regular drive shaft, it'll change things from mine.
    You should really put some thought into what you're going to do....weak drive shafts on the road a 60 mph can catapolt you if they break. If you do something "a little risky" put a NASCAR strap on it to catch it if it falls, would take much to make one. Check out these links.

    http://www.4crawler.com/4x4/CheapTri...line-101.shtml

    http://www2.dana.com/pdf/J3311-1-HVTSS.PDF

    http://www.4x4wire.com/tech/pinionangle/

    The last one's site is down right now....if it comes back its a good article.

    I can post pics of mine if you think it will help you. Let me know.

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    • #3
      Buddy of mine has a 6" lift and all angles he corrected with wedges.

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