Welcome NaPeer!!!

[4.3LXJ]

Hi NaPeer, :welcome: to the :xjtalk: forum!

We would love to know more about you and your Jeep. How you found us, etc...

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[NaPeer]

Thanks for the Welcome!! I'm fixing driveline vibration on my 2000 XJ after I installed a Rough Country 3" lift with full rear leafs a couple weeks ago. Had to cut my old shackles off because the bolts seized in the shackle sleeves, so I ordered an OEM shackle. They came in and looked weak even compared to my old shackles, so I ordered a set of RE Boomerang shackles. They do lift the rear about 1-1/2" more though.
The installation instructions from RC are weak and there was no mention of the installed shim on the bottom of the rear leafs, so I had just installed them the way they came, not taking into account the shim because I didn't really notice it. Driveline vibration was the result but I had no idea what was causing it. Tried the "other" forums, Google, etc and narrowed it down to pinion angle after almost replacing u-joints! I bought some 4° degree shims from 4WheelParts along with center pins and starting tearing my rear suspension apart again when I noticed the shim already in place but backwards from where it should be for my rig. It was probably correct without a shackle extension but not with my Boomerang Shackle! It appears to be about 2.5° so when I turn it around it will be a net effect of 5°. I came in from working on it to Google the rear leaf setup to see if anyone had similar issues and came upon this website! Nice write-up on pinion angle! I'm hoping that the 5° net angle will be sufficient. I'll be installing a Smitty-Built XRC Rear Bumper with tire carrier so I'm sure that will help lower the rear a bit as well. I'll post a pic after I get it finished today and check out the site more. Thanks for the write ups!

[4.3LXJ]

Glad it helped

[bluedragon436]

:welcome: to :xjtalk1: from Delaware!! Hope that the swapping the wedge around will help with the vibration.. Look forward to hearing good news once you are able to get her back together.. and even more so look forward to seeing pics of the XJ!!

[XJ Wheeler]

Welcome to the site! Driveline vibes are a pain to track and fix but at least it's cheap! Hope ya get it going good and post back your progress.

Sent via messenger pigeon. I talk, he types.