RC Lift and Rack - Jeep Commander Forums: Jeep Commander Forum
Suspension / Lifts This is the place to discuss the suspension, lift systems, and other stuff underneath your Jeep Commander

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post #1 of 22 (permalink) Old 09-04-2014, 06:49 PM Thread Starter
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RC Lift and Rack

Just wondering if anyone has come up with a way to lesson the angle on the tie rods ends with the RC Lift. I was told by my mechanic that the R&P is clunking. After the last R&P problem that the rebuild company caused. My free R&P is going again. Not even 10,000 on last R&P
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post #2 of 22 (permalink) Old 09-05-2014, 10:41 AM
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Are you using the MS-10838 Power Steering/Hydrualic fluid? OR, did the mechanic fill up the system with any old PS fluid after replacing the rack?

The MS-9602 spec (which is just ATF+4, but keep in mind that exceeds a lot of PS fluids) is NOT sufficient for the Commander/GC, which you have a Hemi that has a hydrualically driven fan powered from the PS system. I suspect the hydrualic driven fan is the reason for the higher MS-10838 spec for PS fluid, BUT I HAVE NEVER BEEN ABLE TO CONFIRM THAT. I don't have the hydrualic driven fan in my Commander, so it would be nice to able to use something meeting the MS-9602 spec that is much easier and cheaper to find, if I could confirm that MS-9602 is sufficient for Commanders that do NOT have the hydrualic driven fan.

The MS-10838 is only available from the dealer and rather expensive.

Last edited by Mongo; 09-05-2014 at 10:47 AM.
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post #3 of 22 (permalink) Old 09-05-2014, 12:45 PM Thread Starter
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He did use proper fluid. Mechanic is telling me that the severe angle is causing premature failure.
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post #4 of 22 (permalink) Old 09-05-2014, 04:31 PM
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I'm surprised that this is an issue. I am not aware of this being a common problem.

Maybe the mechanic is blaming the failure on the RC so as to not be liable?
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post #5 of 22 (permalink) Old 09-05-2014, 05:06 PM
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The more severe angle of the tie rods from the lift could put more stress on the rack, it would also increase the stress on the tie rod ends, especially the inner tie rod joints, they would be more likely to fail sooner.

If you've never had a tie rod joint fail, but you've had your 2nd steering rack fail, I'd start to get a bit suspicious. I can't say it isn't possible, but its NOT likely.

But for a two inch lift, that just extends the suspension in its range of motion, that increase in stress would NOT be that much, it would NOT likely cause that extreme of a early failures. So maybe the Commander is more susceptible to the slight increase in stress, but if that was true I think we would be seeing more posts about early Rack Failures than we do.

Again, I can't tell you for sure, and NO I don't have a lift, we'll have to wait until those with the RC lift chime in and get a bit of a consensus.

Oh, the Mechanic "claiming" he used the proper fluid can mean different things. Some would pick up a bottle of the wrong fluid and say, "See, it says Power Steering Fluid right on the bottle, of course I used the correct fluid". Some might refer to the label on a bottle of fluid that says it is for all Late Model Chrysler and Jeep vehicles, and it barely meets the 3 specs ago from the 90's for Chrysler vehicles. Some might refer to a TSB stating that MS-9602 is suitable for retrofit PS fluid for all Chrysler vehicles NOT realizing the later spec for the Commander/GC states MS-9602 is NOT suitable and only the newer MS-10838 is suitable.

The MS-10838 I bought for my Commander was totally clear, when I flushed out the old fluid, it came out black, although the new fluid has been in there much longer and is still staying clear. So you can wipe the dipstick on a clean rag, if its pink/red/amber or any color than clear or clear with some suspended dirt making it look blackish, then I would be extremely suspicious it was serviced with the incorrect fluid.

Last edited by Mongo; 09-05-2014 at 05:09 PM.
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post #6 of 22 (permalink) Old 09-05-2014, 05:32 PM
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Might just need to snug up the yoke adjustment

http://www.theultimatejeep.com/showt...-popping-noise)
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post #7 of 22 (permalink) Old 09-05-2014, 06:53 PM Thread Starter
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Matt, Do you think the angle is wearing the rack. I was thinking of making a tie rod end adapter and using Universal ball mount with tapered bolt.
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post #8 of 22 (permalink) Old 09-05-2014, 06:54 PM Thread Starter
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ill try to snug the yoke adjustment, should be easy enough, or am I wrong?
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post #9 of 22 (permalink) Old 09-05-2014, 07:01 PM
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The increased angles do cause more wear, but not in 10k miles.

The rack noise is common in XK/WK's, I believe because the excess angles make the extra slop in the gears noticeable. It's been well over a year since I adjusted my rack yoke, i'm running much steeper angles than you, I've probably beat mine up offroad more than you in the past year, and my noise hasn't come back.

Your only option to decreasing the angle is to buy the Superlift (not a bad option). You can't just change the angle of the tie rod, that'll cause bump steer which is worse than a benign clunk noise.
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post #10 of 22 (permalink) Old 09-05-2014, 11:28 PM Thread Starter
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Is there a maximum I should turn that adjustment screw. Is it like a Steering box screw? Im gonna play with it tomorrow morning before the rains come...
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