As part of my 100K preventative maintenance I'm looking to rebuild or replace the rear boomerang (rear upper control arm).

If you replace the boomerang the options seem to be one made by Crown Automotive and the OEM Mopar. The street price of the Mopar part is about twice that of the Crown ($320 compared with $160). Somewhere I read a suggestion that the Mopar part was heavier duty. Is that true? Is it worth the extra money? Or are they of similar quality?

If the OEM is better it might be worth rebuilding.

(Relevant for 4x2 or 4x4 so I'm posting in 4x2.)

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2003 Liberty, ARB bumper w fogs and KC SlimLites
Front Franky II HD, rear OME948 w Rancho RS9000/XL shocks
LT245/75R16C Duratracs on Moabs
4.10 gears, front & rear ARB lockers, Boulder Bars, AFE Stage 2 intake
Surco rack w BajaRack jerry can holder
Cobra 75 WX ST

06 LJ Rubi, 3.5" RE SA and 33" BFG KM2s, GenRight tank

Mopar is heavier, although they look the same they do not last the same. I had one last 15,000 miles they replaced it with another one, it lasted 10,000
Go with MOPAR and be done
I'll admit mine gets more wear than most but money is money

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 Goodyears/ 4.10's etc, 04 Kilimanjaro Edition loaded

That's what I wanted to know, thank you!

Not in a rush to do it (need to save pennies), but now I have a plan.

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2003 Liberty, ARB bumper w fogs and KC SlimLites
Front Franky II HD, rear OME948 w Rancho RS9000/XL shocks
LT245/75R16C Duratracs on Moabs
4.10 gears, front & rear ARB lockers, Boulder Bars, AFE Stage 2 intake
Surco rack w BajaRack jerry can holder
Cobra 75 WX ST

06 LJ Rubi, 3.5" RE SA and 33" BFG KM2s, GenRight tank

can anyone give a list of what i would need from rock auto to rebuild the original, they have a lot of bushings listed for the rear control arm...

moog has:
Rear To Axle (Lower Rear)
and
Rear Lower To Frame

so i am assuming i need 2 f the rear to axle, ad 1 rear to frame? or is it the other way around?

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02 KJ Limited, 255 70 16 General AT2, Ironman Lift, JCR sliders, Mopar skids, radiator skid, LS/373 gearing, factory front hooks and rear hitch

92 XJ 4.0, AW4, NP242, 31s, 1.75 spacer, ZJ V8 coils, double cherokee leaf pack, 2 inch shackles, dnynomax exhaust, magnaflow cat, front hooks & rear hitch, gas tank skid, front skid, warn t-case skid

LCA in the rear have one on each end per side
don't know what 2 f the rear axle means

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 Goodyears/ 4.10's etc, 04 Kilimanjaro Edition loaded

thanks, i will look into it more.

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02 KJ Limited, 255 70 16 General AT2, Ironman Lift, JCR sliders, Mopar skids, radiator skid, LS/373 gearing, factory front hooks and rear hitch

92 XJ 4.0, AW4, NP242, 31s, 1.75 spacer, ZJ V8 coils, double cherokee leaf pack, 2 inch shackles, dnynomax exhaust, magnaflow cat, front hooks & rear hitch, gas tank skid, front skid, warn t-case skid

I procrastinated on replacing the boomerang as preventative maintenace, and the darned thing eventually failed on me. There wasn't much warning, just a little rattling now and then. When it failed it damaged the "axle stabilizer bracket" as well as the speedometer cable.

I ended having those replaced with Mopar parts and replaced the rear LCAs as well. Because I didn't do the work myself it was not cheap, but now the rear suspension is in great shape!

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2003 Liberty, ARB bumper w fogs and KC SlimLites
Front Franky II HD, rear OME948 w Rancho RS9000/XL shocks
LT245/75R16C Duratracs on Moabs
4.10 gears, front & rear ARB lockers, Boulder Bars, AFE Stage 2 intake
Surco rack w BajaRack jerry can holder
Cobra 75 WX ST

06 LJ Rubi, 3.5" RE SA and 33" BFG KM2s, GenRight tank