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Unread 10-19-2010, 06:18 PM   #1
Cassafrass
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Rear Axle Shims

I have really bad vibrations in the yj after 3rd gear. I took a look at my drive shaft and the angle is horrible. So my question is first off what degree shims do I need and where to get them? As far as what degree right now as it sits theres about a 3.5" suspension lift, 1.5" shackles and a 2" body lift. Eventually I want to take the body lift and maybe the shackles out so I was thinking I could buy a few different wedges so I could change the angle as I lower it. Do they sell them in sets? Ive been looking but cant seem to really find anyone that sells them. Any help would be appreciated. Thanks in advance.

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Unread 10-19-2010, 07:23 PM   #2
moonshinefuel
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Shims, I would get steel ones, I understand the alloy aluminum ones can crack.
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Unread 10-19-2010, 07:29 PM   #3
yellow2kgt
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What he said.. The aluminum ones will crack. Only get steel shims. You really need to crawl under your Jeep and measure the difference between your TC and pinion. For a standard slip shaft you want those measurements to be as close to parallel as possible. Also, make sure you get the type of shims that bolt under the spring pin and not slip over it.
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Unread 10-19-2010, 07:31 PM   #4
4.7stroker
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I ran alloy shims for 4 years and only removed them because I installed an 8.8. I would loose the 1.5" shackle lift and replace it with a lift of 1" or less. I believe I was using 8* shims with no problems.

Dwayne
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Unread 10-19-2010, 09:18 PM   #5
jdubsjeep
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I have replace 2 sets of aluminum shims on 2 different Jeeps and both were cracked. Here is a link for great wedges: JKW Offroad
Remember if you don't have a SYE / CV joint driveshaft, the angle at the t/c should be the same as on the differential. Check out: Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist
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Unread 10-19-2010, 11:31 PM   #6
Axl Jack
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Quote:
Originally Posted by yellow2kgt View Post
Also, make sure you get the type of shims that bolt under the spring pin and not slip over it.
What he said.

Here's a link for some shims. I'm using the 2 degree ones in my 8.8. They are steel and bolt under the center pin and even have a recessed hole so that the center pin isn't "angled."
4 Wheel Drive Hardware Search-RH3

On a side note.... I'd remove the shackles first, then work on getting your axle shimmed correctly. You may decide you want to keep that 2" BL later on, especially when it comes time for new (larger) tires.

But that's just me. Body lifts and I don't see eye to eye (northern, oxidized Jeeps)
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Unread 10-20-2010, 06:36 AM   #7
Krochus
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My alloy shims cracked as soon as I snugged up the center pin, they didn't even make it through the install

I have a set of used steel six degree shims I no longer need. If you think you might be interested.
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Unread 10-20-2010, 07:04 AM   #8
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Quote:
Originally Posted by cassiecm05 View Post
I have really bad vibrations in the yj after 3rd gear. I took a look at my drive shaft and the angle is horrible. So my question is first off what degree shims do I need and where to get them? As far as what degree right now as it sits theres about a 3.5" suspension lift, 1.5" shackles and a 2" body lift. Eventually I want to take the body lift and maybe the shackles out so I was thinking I could buy a few different wedges so I could change the angle as I lower it. Do they sell them in sets? Ive been looking but cant seem to really find anyone that sells them. Any help would be appreciated. Thanks in advance.

If your in Mansfield PA, I have a pile of shims you can choose from. I am maybe 30min from you.
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Unread 10-20-2010, 06:27 PM   #9
Cassafrass
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Im still kind of confused on what degree I need. Right now I need shims for i guess about a 5 inch lift. So what degree would I need?
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Unread 10-20-2010, 09:05 PM   #10
Axl Jack
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We can't answer that question exactly. We can only give you a general zone. You may need 4 degree shims, you may need 6 degree shims. (Hopefully no more than 6.)

You need to get a driveshaft angle measuring tool, maybe something like a magnetic base protractor (shown in photo).



You need to google around "How to measure driveshaft angle." Read, read, and read some more until you understand. Shims aren't expensive, but it would be a shame to waste $20 because you did it wrong in a hurry.

LINK:
Driveline 101
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Unread 10-20-2010, 09:12 PM   #11
bigtsw87yj
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lose the shackles before you do this or you might be doing it again
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Unread 02-25-2013, 03:36 PM   #12
johnnykind
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took me about 3 hours (no hurry) shims cost about $30 bucks, new center pins about $15, your gonna need a floor jack, at least 2 jack stands, a couple of "C" clamps, or a few pairs of vice grips, to hold the leaf pack together when you take out the shims it makes putting the new pin in pretty easy, if your springs are still under the axle, jack from the frame and put the jack stands on the frame lift vehicle about 4 inches off the ground, set your stands, loosen the u bolts remove bottom plate, lift axle with another floor jack or by hand put in the new center pins, with the wedges, and tighten up the center pins re-align the axle so the new pins fit in the holes in the axle perch, re-install bottom plate tighten u-bolts step back take a look make sure everything looks straight, test drive... recheck all bolts after test drive make sure their still tight...done
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Unread 02-25-2013, 03:42 PM   #13
Mark05059
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Im sure in the 3 years from the last post that the issue is either fixed or no longer an issue...
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