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Thread: Warning to those with Superlifts

  1. #1
    Lifetime Member Getting Dirty Matt's Avatar
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    Exclamation Warning to those with Superlifts

    Check your pinion angles. If you're not having an issue, i suspect one of two things:

    1) Your u-joint is in great shape... and you'll eventually have an issue

    or

    2) You're running aggressive tires and don't realize you're having an issue yet.


    Mark (lekmedm) recently had a SL 4" installed, standard height, and asked me to check out a few issues he has noticed since the lift install. Most concerning to me was the drone sound he had at highway speeds, especially with light throttle applied. I knew it was either his pinion bearing or the u-joint.

    Well, regardless I was not happy with the pinion angle from the SL install. So whether that was the cause of the noise or not, in my opinion it needed to be corrected. He ordered new upper control arms from Rustys Offroad earlier this week. By skipping the powder coating he was able to get them on Friday and we put them in today.

    The new arms (pictures below) corrected his pinion angle and eliminated the drone noise. I'm yet again disheartened at the fact that a company like Superlift would miss something like this. Looks like when im ready to put on my 4" kit I know of a guaranteed $240 addition to the kit (unless superlift fixes it in the mean time).

    Some pics of the new Rustys arm and before/after pinion angles:










  2. #2
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    This is the first I'm hearing of bad pinion angles after a Superlift install. Last I knew Superlift provided both upper and lower brackets for the control arms to correct the pinion angles. Were both the upper and lower brackets installed and the pinion angle still looked like that??
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    Lifetime Member Getting Dirty Matt's Avatar
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    They actually don't supply brackets for the lowers anymore, they have a re-designed lower arm. The upper brackets were installed correctly. I'm wondering if this is an artifact of their quick LCA redesign....

    Like said in the beginning of the post, i'm guessing most don't realize they have an issue because most guys run much more aggressive tires. Mark's running a relatively mild A/T so the drone noise was easily noticeable.

    I'd be interested in seeing other member's pinion angles with the superlift installed.

  4. #4
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Hmmm well I've seen several superlifted XK's and WK's with the older kit (upper and lower brackets) and the pinion angle was spot on.

    I like the idea of adjustable control arms better then brackets anyways so at least him upgrading helped improve his lift kit
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    Senior Member Getting Dirty lekmedm's Avatar
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    Quote Originally Posted by Matt View Post
    Looks like when im ready to put on my 4" kit I know of a guaranteed $240 addition to the kit (unless superlift fixes it in the mean time).
    Since we now know how long the new uppers need to be, someone could order fixed-length arms that should be less expensive.


    Sent from wherever my Jeep takes me.
    2007 Commander Overland / 4" SuperLift / 285/70R17 Cooper Discoverer ST Maxx / Rusty's adjustable rear UCAs / Carolina Driveline front drive shaft / Flashpaq / DRLs & Tilting Mirrors / Autolite Iridiums / Cobra 29LX Chrome LE CB & Firestik antenna / Rear fog lights / Mopar Grille Guard with HID driving lights
    "4 wheel drive does not mean 4 wheel stop!" -Lee Goldberg, WABC TV weatherman

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    Senior Member Getting Dirty stites-xk's Avatar
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    What parts did you use?

    Sent from my DROID RAZR using Tapatalk 2

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    Super Moderator Getting Dirty 07JeepXK's Avatar
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    I'm curious what some only the 5+ inch lifted guys pinion angles look like
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

  8. #8
    Lifetime Member Getting Dirty valpacer's Avatar
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    As far as I know most have adjustables on, and in my case I replaced the factory shaft with a custom double cardan shaft as well

    Dave

    Sent from my LT18i using Tapatalk 2
    2007 WH Grand Cherokee CRD QDII - 3" Exhaust, GDE Flash Tune, CRDSTU Hybrid Lift & bash Plates, 4xGuard Rock Rails & Rear Sliders, Saguaro F&R Bars, Warn 9.5CTI-s, AEV Saverge Rims, 35" KM2's, Snorkel, Custom Rear Drawers, ARB Dual Compressor + On Board Air, BullyDog Monitor, Dual Optimas Front and Dual Rear Aux Batteries YouTube Vids

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    Senior Member Getting Dirty The_War_Wagon's Avatar
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    We've gotta re-do the shock towers and rear axle geometry on my RC because of this! New HD driveshafts and U-joints aside, bad angles make for SHORT wheeling sessions... and long rides on rollbacks...
    '07 Jeep Commander, Rocky Mountain Edition - 287 V-8 - Superchipped - aFe Stage II R-5A CAI - Flowmaster Super 44 - 2" Daystar lift - Spidertrax spacers - 32x10.5x17 Cooper A/T's - Fastman throttlebody - Skyjacker 8000 shocks

  10. #10
    Lifetime Member Getting Dirty Matt's Avatar
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    Quote Originally Posted by stites-xk View Post
    What parts did you use?
    Just called up Rustys Offroad and said we needed adjustable upper arms for the XK. They already had the specs on file (makes me think we're not the first to actually see this issue).

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