Rear Upper Control Arm Replacement

amir.flores · **Joined:** Fri Jan 20, 2017 2:09 pm **Posts:** 14

Hello,

The bushings on my rear upper control arm are worn and cracked. The ball joint seems to be OK. I will replace the entire arm.

Can anyone suggest an aftermarket rear upper control arm to use.

The best prices found are on Rock Auto. Below are the brands.

MOOG $96.79
Mevotech $87.70
Ultra-Power $68.79
Dorman $70.79
MAS $80.70
ACDELCO $123.79

Thanks for the help!

JeepinJarhead03 · **Posted:** Fri Jun 02, 2017 3:36 pm

the aftermarket rear UCAs seem to last less than 1/3rd the time the mopar units last. depending on which bushings the MOOG arms have they may be the best bet but the mopar ones seem to last the longest

imo, youre better off pressing in new bushings that aren't garbage, costs about 50 bucks to replace the bushings and balljoint with high quality hardware

tommudd · **Posted:** Fri Jun 02, 2017 3:39 pm

amir.flores wrote:

Hello,

The bushings on my rear upper control arm are worn and cracked. The ball joint seems to be OK. I will replace the entire arm.

Can anyone suggest an aftermarket rear upper control arm to use.

The best prices found are on Rock Auto. Below are the brands.

MOOG $96.79
Mevotech $87.70
Ultra-Power $68.79
Dorman $70.79
MAS $80.70
ACDELCO $123.79

Thanks for the help!

None of the above
At one time MOPAR ones were backordered , so I went cheaper still was 165 bucks, went through two of them in less than 6 months time.
Total junk

u2slow · **Joined:** Sun Mar 11, 2012 7:26 pm **Posts:** 160

Moog and Dorman's bushings are both offshore garbage. I don't know if the Mopar ones are any better.

The bushings last best when they aren't subjected to angle at their normal ride height.

EDIT: Its challenging to replace bushing on a used/rusted arm without damaging it. As careful as I was, the 2ndtime replacing mine, I had to tack-weld the bushings in because the holes had stretched.

ATXKJ · **Posted:** Sun Jun 04, 2017 8:05 pm

for a while there was a split on Mopar street versions vs heavy duty

the heavy duty was the original

WWDiesel · **Posted:** Sun Jun 04, 2017 9:45 pm

u2slow wrote:

EDIT: Its challenging to replace bushing on a used/rusted arm without damaging it. As careful as I was, the 2ndtime replacing mine, I had to tack-weld the bushings in because the holes had stretched.

Funny, I had the same issue when I tried to replace the bushings on the OEM boomerang. Had to tack weld them in place just like you did till I could get a whole replacement arm shipped in!
Replaced it with a Moog unit, and so far it has held up OK and I hope it continous to do so. I do hear those forward mounts where the boomerang mount to the body every once in a while when the transmission upshifts or downshifts between gears!
IF it fails again, I would certainly consider upgrading to the WJ Adjustable A-Arm. And yes, I realize it would require making a new HD mounting bracket to fit the KJ differential. :roll:

amir.flores · **Joined:** Fri Jan 20, 2017 2:09 pm **Posts:** 14

Looks like I may have to settle for one of the aftermarket ones, probably MOOG. I did some research and the MOPAR originals are over $400+ USD!

tommudd wrote:

amir.flores wrote:

Hello,

The bushings on my rear upper control arm are worn and cracked. The ball joint seems to be OK. I will replace the entire arm.

Can anyone suggest an aftermarket rear upper control arm to use.

The best prices found are on Rock Auto. Below are the brands.

MOOG $96.79
Mevotech $87.70
Ultra-Power $68.79
Dorman $70.79
MAS $80.70
ACDELCO $123.79

Thanks for the help!

None of the above
At one time MOPAR ones were backordered , so I went cheaper still was 165 bucks, went through two of them in less than 6 months time.
Total junk

tommudd · **Posted:** Tue Jun 06, 2017 12:47 pm

More yes , but in the long run money in the bank

Myke · **Posted:** Thu Jun 08, 2017 8:07 am

I'd suggest going jba 4 link over replacement ucas but that's because I break the ball joint mount.

amir.flores · **Joined:** Fri Jan 20, 2017 2:09 pm **Posts:** 14

Hi Myke,

Would you happen to have any pictures of your KJ with the 32's, OEM Wheels 17" and 1.5" spacers?? Thanks

Myke wrote:

I'd suggest going jba 4 link over replacement ucas but that's because I break the ball joint mount.

Rear Upper Control Arm Replacement

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