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Old 05-11-2014, 10:17 PM
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Hitting hard after rear upper arm install

This afternoon I installed my adjustable rear upper control arms and know every bump feel likes I'm bottoming out my suspension on the rear passenger side. The only thing really different is a big curve in both of my rear coils. Any ideas?

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Old 05-11-2014, 10:21 PM   #2
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I'm thinking you adjusted them too short. Did you check your rear pinion angle?

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Old 05-11-2014, 10:30 PM   #3
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go buy yourself a $5 magnetic angle finder (harbor freight) pull the rear driveshaft and measure the angle from the flange. I forget what angle is ideal but that shouldnt be too hard to locate.
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Old 05-11-2014, 10:45 PM
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I thought I was supposed to just turn the axle so the drive shaft attaches straight on without any angle. I'll go pick up an angle finder in the morning
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Old 05-11-2014, 10:59 PM   #5
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Quote:
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I thought I was supposed to just turn the axle so the drive shaft attaches straight on without any angle. I'll go pick up an angle finder in the morning
that is correct, but since your springs are bowing now something has to have changed. if your pinion angle is good RK makes some wedges that will take that bow out of the springs.

a little bowing is normal. mine sure do!
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Old 05-11-2014, 11:00 PM   #6
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Quote:
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that is correct, but since your springs are bowing now something has to have changed. if your pinion angle is good RK makes some wedges that will take that bow out of the springs. a little bowing is normal. mine sure do!
X2

You want the pinion angle a couple degrees lower than the DS.
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Old 05-11-2014, 11:14 PM
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Awesome. Thanks guys. I actually have some rock krawler wedges and a rear track bar coming in on Tuesday
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Old 05-12-2014, 07:43 AM   #8
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Not as accurate as pulling the DS but worked for me. Less than 2* separation.
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Old 05-14-2014, 01:43 PM
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Just an update. Just got under the jeep today to put the wedges on and found this on my passenger side bump stop. I guess that's where the hard hitting came from. The track bar drop bracket bolt was making contact
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Old 05-14-2014, 02:51 PM   #10
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If it wasn't hitting with the stock uppers then you must have set the new uppers shorter than stock. Have you checked your pinion angle?
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Old 05-14-2014, 04:59 PM   #11
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IMO if you lengthened the uppers, it rolled your bump stops back toward the track bar and now your bolt is hitting. I would think you could adjust your arms to pull the axle back toward the front by shortening the arms a bit. If you have an aftermarket DS you might need to shorten both to retain angle. Or, try flipping the bolt around to see if you can get more clearance.
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Old 05-14-2014, 05:06 PM   #12
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IMO if you lengthened the uppers, it rolled your bump stops back toward the track bar and now your bolt is hitting. I would think you could adjust your arms to pull the axle back toward the front by shortening the arms a bit. If you have an aftermarket DS you might need to shorten both to retain angle. Or, try flipping the bolt around to see if you can get more clearance.
That's true. The uppers would be too long not too short. I don't know what I was thinking. In any case, it's the pinion angle that needs to be set correctly. I'm assuming stock lowers?
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Old 05-14-2014, 05:39 PM   #13
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this is very common. Should of known. Install a axle bracket.

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