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Old 11-20-2018, 04:19 PM
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Jeep pulling/Bump steer

I just got my jeep lifted at the shop (didn't trust myself enough to do it) two weeks ago. I had a 3.5in MetalCloak True Duel RockSport lift kit put on with 35in Nitto Trail Grapplers too. A few issues I noticed were: Jeep is now pulling to the left, some serious bump steer when driving on the highway, and there is a loud vibration noise between about 5-8 mph. I do not have any issues when cruising 70-75mph other than pulling to the left and BS. I took it back the following week to have these checked out and the pulling to be fixed, however, still pulling a bit at higher speeds. They also told me the loud vibration noise when driving slow is from the M/T tires since it is cruising on the knobs of the tire - does this sound right? Nothing feels like it is vibrating just a loud noise. I spoke to the service director and he said they will have it fixed and are going to get it right.

I wanted to get some opinions before I drop it off a second time. I know the pulling is on them and should be fixed and bump steer is pretty normal on a lifted jeep. I am considering putting on a steering stabilizer just for comfort purposes and possibly re-gearing.

Any advice would be greatly appreciated!

Greg

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Old 11-20-2018, 11:10 PM   #2
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Few questions:
Was the jeep aligned after the lift?
What tire pressure are the tires at? Shops like to set them at factory spec and it's WAAY to much. You'll probably be comfortable around 28. Might fix a lot of what you are describing.
What do you consider bump steer? Most don't actually know what it is. You are correct lifted jeeps can have it, and at 3.5 of lift it's possible you'll need to go high steer.
The low speed noise and vibration can very possibly be the MT's. My duratracs are really feathered from me not getting them rotated properly. Driving through a parking lot makes all the plastic on my jeep rattle and buzz lol.

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Old 11-20-2018, 11:43 PM   #3
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x2 on alignment
x2 on M/T's at low speed being the vibration, mine were all sorts of loud. Airing them down some may help that vibration a bit too
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Old 11-21-2018, 09:22 AM   #4
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Properly Lifted Jeep wonít have Bump steer. So, what do you mean by Bump steer?
That is a great lift kit so unless they didnít put all the parts in you shouldnít have bump steer.
Do not worry about the steering stabilizer, that does not fix anything and a properly set up front end does not require one at all.
Pulling can be attributed to many things and could have been present before the lift. The bigger tires will enhance that pull. First off, getting an alignment check will take that out of the equation. If that doesnít solve the problem it could be a sticking caliper or a bad wheel bearing.


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Old 11-21-2018, 11:08 AM   #5
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My two cents. If you added 35" tires that are 12" or so wide, and those tires replaced stock or stock width tires, you will likely find that the new wider tires react differently. They will follow pavement irregularities much more. Additionally, mud tires like the Trail Grapplers will be noiser than other tires and often don't ride as smooth.

A Steering Stabilizer probably won't do much good, it could make your pull to the left stronger in fact if you went with a pressurized SS.

Finally, I am a big fan of re-gearing for bigger tires. Gearing is the best way to add performance or restore lost performance to your Jeep. And while it isn't cheap, it isn't that expensive in the scheme of power adders.
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Old 11-21-2018, 12:33 PM
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My jeep was aligned after the lift and I took it back for them to rotate the tires to confirm it wasn't a tire issue and that alignment was correct. The tire pressure was originally at 28-32 but they bumped it up to 35 once I got it back the second time. I can't confirm that I truly know what bump steer is but when going at higher speeds I often will need to over correct the wheel so I don't jump into another lane/cross the line if i hit a decent size whole or cross a bridge. I am hoping that the pull has a lot to do with what I think is the bump steer issue. Good to know about the noise and that it's not a true issue - I was thinking about getting noise dampening pads if that will make much of a difference.
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Old 11-21-2018, 12:37 PM
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I never noticed a pull prior to the lift, I bought my JKU in Feb 2017 brand new so there were no noticeable present issues. I went to the same dealership I bought it from becuase they lift all the jeeps & trucks they sell through there. I know the stabilizers are more of a bandaid but I was only considering for comfort purposes if that will even do much. Thanks about the other two issues, I will mention it to the service director when I meet with him next week.
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Old 11-21-2018, 12:42 PM
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I have definitely noticed it will follow deep cracks in the road and other pavement issues. I read up on pressurized ones to avoid as it will cause a pull to it as well.

If I remember correctly, I think I am sitting at 3.73 ratio right now and the shop said I 'should' be fine. I looked into re-gearing and think it may be worth it down the road.
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Old 11-21-2018, 12:46 PM   #9
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Here is good article / explanation on Bump Steer (purportedly for solid axle vehicles).
http://www.naxja.org/html/techarticl...psteertech.htm


A good read.
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Old 11-21-2018, 01:26 PM   #10
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It does not sound like you have "Bump Steer".
If you can, get the alignment printout and post it. You may just need your castor adjusted.
Bigger wider tires will steer differently, and they will follow the road more so than smaller tires. I would not run tires that size at 35 psi. I would run then down around 28 to 30 psi.
As to being fine with that size tires and 3.73 gears, that is up to you. It will be slower than it was before the bigger tires, but perhaps you will be fine with it. Personally, I found 3.73 gears to be too tall for 32" tires. I would want 4.56 or 4.88 gears with 35" tires. My tires measure 35.5" and I have 4.88 gears. I wish I had gone with 5.13 gears. But I don't live at sea level on flat terrain. Where you live and how you drive can make a difference in what gears you want / need. If you live out on the eastern shore you may be fine with 3.73 gears. If you live in anywhere else in Maryland I would think you would want more gear, but that is up to you.

What shop is doing the work? Is it a dealer or a real Jeep shop?
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Old 11-21-2018, 03:56 PM   #11
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I can attest that when I got my 35Ē Nitto trail grapplers on I could feel a thump thump thump feeling as I slowed down or first accelerated at a stop sign etc. it only took a week or so (100 miles tops of driving) for them to wear in and I donít hear the buzzing noise/feeling anymore.

I love the tires btw in the mud trails around here in PA.


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Old 11-26-2018, 01:53 PM
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It does not sound like you have "Bump Steer".
If you can, get the alignment printout and post it. You may just need your castor adjusted.
Bigger wider tires will steer differently, and they will follow the road more so than smaller tires. I would not run tires that size at 35 psi. I would run then down around 28 to 30 psi.
As to being fine with that size tires and 3.73 gears, that is up to you. It will be slower than it was before the bigger tires, but perhaps you will be fine with it. Personally, I found 3.73 gears to be too tall for 32" tires. I would want 4.56 or 4.88 gears with 35" tires. My tires measure 35.5" and I have 4.88 gears. I wish I had gone with 5.13 gears. But I don't live at sea level on flat terrain. Where you live and how you drive can make a difference in what gears you want / need. If you live out on the eastern shore you may be fine with 3.73 gears. If you live in anywhere else in Maryland I would think you would want more gear, but that is up to you.

What shop is doing the work? Is it a dealer or a real Jeep shop?
I am dropping it off today to have them correct. I will request an alignment printout as well but hoping all is good once I pick it up. I will drop the psi too, after I got it back they pumped them up to 37. I want to look into upgrading the gears soon to help with acceleration (and gas if it helps that?).

I'm over by Ft Meade so only about 1.5 hours east of you, I often go to eastern shore and Frederick too. I only have a 5-10 min commute to work so not too much hills unless it's the weekend.

I had Criswell dealership in Gaithersburg do the lift and having them correct the pull this week.
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Old 11-26-2018, 02:20 PM   #13
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I know two people that have/had MC 3.5" game changers and they do/did have bumpsteer. MC does not include the high steer kit in their 3.5".

last year a buddy and I did a 100 mile long stretch of incredibly rough offroad forest service road. He was complaining about how much work it was and I was like this is like an interstate lol.(mine was 3.5 AEV with highsteer kit) we swapped rigs and and it was night and day, his bumpsteer was terrible. He ordered an aev highsteer kit as soon as he got home. Not sure why MC does not think they are necessary on the 3.5" The highsteer kit fixed his bumpsteer.
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Old 11-26-2018, 02:41 PM   #14
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Originally Posted by gdavidson View Post
I am dropping it off today to have them correct. I will request an alignment printout as well but hoping all is good once I pick it up. I will drop the psi too, after I got it back they pumped them up to 37. I want to look into upgrading the gears soon to help with acceleration (and gas if it helps that?).

I'm over by Ft Meade so only about 1.5 hours east of you, I often go to eastern shore and Frederick too. I only have a 5-10 min commute to work so not too much hills unless it's the weekend.

I had Criswell dealership in Gaithersburg do the lift and having them correct the pull this week.
I think Jadmt may have answered your question best. But to add, I would suggest you either learn to do this stuff yourself or develop a relationship with a quality independent shop. World Tour Off Road in Annapolis is a really good shop. Further from you, but closer to me, is Chaos Offroad in Winchester, Va.
I actually work near Ft Meade. It is a bit of a commute, but worth it.
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Old 11-27-2018, 05:24 AM   #15
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The pull to the left is from your trail grapplers. I have it to with mine. Some tires pull right. It’s called radia pull and yes it’s real
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Old 11-27-2018, 06:41 AM   #16
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So what psi are in the tires?
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Old 11-27-2018, 06:17 PM
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I know two people that have/had MC 3.5" game changers and they do/did have bumpsteer. MC does not include the high steer kit in their 3.5".

last year a buddy and I did a 100 mile long stretch of incredibly rough offroad forest service road. He was complaining about how much work it was and I was like this is like an interstate lol.(mine was 3.5 AEV with highsteer kit) we swapped rigs and and it was night and day, his bumpsteer was terrible. He ordered an aev highsteer kit as soon as he got home. Not sure why MC does not think they are necessary on the 3.5" The highsteer kit fixed his bumpsteer.
My bumpsteer isn't too bad, i think the pulling has something to do with it but definitely good to know. I will for sure look into a highsteer kit in the near future. Are these difficult to install yourself/need the right tools for this?
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Old 11-27-2018, 06:20 PM
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I think Jadmt may have answered your question best. But to add, I would suggest you either learn to do this stuff yourself or develop a relationship with a quality independent shop. World Tour Off Road in Annapolis is a really good shop. Further from you, but closer to me, is Chaos Offroad in Winchester, Va.
I actually work near Ft Meade. It is a bit of a commute, but worth it.
I for sure want to start getting under the jeep myself, just didnt want to start with the lift kit. I wish I knew about World Tour Off Road about a month ago as I'm only a half hour from Annapolis.
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Old 11-27-2018, 06:21 PM
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So what psi are in the tires?
They had them at 28/30 on the left front/back and 32/34 on the right front/back which is what i thought was the initial pull but took it back just in case. They pumped it up to 36 psi which i'm going to drop when i get it back.
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Old 11-27-2018, 06:28 PM
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The pull to the left is from your trail grapplers. I have it to with mine. Some tires pull right. Itís called radia pull and yes itís real
After all the research tonight about the Nitto TGs, it seems like it is the tires doing the pull. I dont think it is radial pull as I have rotated the tires all around and it continues to pull in the same direction. Everything i have read talks about the tread itself or doesnt give true explanation as to why it's the tires. I plan on calling Nitto tomorrow to see what I can get out of it, either a swap for ridge or terra grapplers or just a straight return.

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