I could see a little shake in mine when it was running up on the stands.

If the wheels are not dynamically balanced correctly with weights on both front and back it can cause a slight wobble in the wheel at speed. Are you seeing it move at a low speed on when its turning at a high speed? A lot of places are only capable of a static balance or will only do a static balance to aftermarket wheels in order to keep from having to put weights on the front.

Quick little explanation.
http://en.wikipedia.org/wiki/Tire_balance#Dynamic_balance

Good luck with it.

I could see a little shake in mine when it was running up on the stands.

If the wheels are not dynamically balanced correctly with weights on both front and back it can cause a slight wobble in the wheel at speed. Are you seeing it move at a low speed on when its turning at a high speed? A lot of places are only capable of a static balance or will only do a static balance to aftermarket wheels in order to keep from having to put weights on the front.

Quick little explanation.
http://en.wikipedia.org/wiki/Tire_balance#Dynamic_balance

Good luck with it.

We ran the wheelspeed up to 70 mph; we also just put it in 4th gear and let it run on its own. You could see it in both scenarios, but even at slower speeds, you could see there was some oblong movement as if either the wheel was bent or it wasn't centered on the hub. I'd find it very odd that all wheels were out of round. This leads me to believe the wheels might not be centered correctly. They wheels are US Wheel Type 37-5755, which are are not hubcentric and require conical lugs.

I brought the wheels (both times) to a local chain of wheel/tire stores that I've been to many times. They use a high-speed balancer; not sure what type.

I will check to make sure the rig has conical lugs and that it's seated right. After that, I might bring it to "the other" tire shop and have them look at it.

- Andy

I have the same issue, but only above 65. Like to know what you find too.

I had a very similar noise for almost a year after installing my lift. I put in the AE4.5" lift in and asked and posted up about pinions angles. I was told universally that standard "U"joints need the pinion angles to match the TC output, while double cardane driveshafts(cv) require the diff to point at the TC output.

I talked to Geoff at Zukinations about this just recently and he stated that they recommend that the pinion needs to be pointed upwards but not directly at the TC output, he uses an angle of about 10-13 degrees when measured on the oil return flat under the pinion snout, this is approx 2/3rds of the angle required to match the pinion and TC output angles.

Since I used those specs the noise has gone away!

So a bit of an update. I brought the Kick to America's Tire to talk with someone there about the wheels. They were quite helpful, actually.

He took one look at my BFGoodrich All-Terrains and said, "Those are 22 year old tires." (Sure enough, the date stamp was on there.) I told him about the wheels being a bit out of round, and he said that it was likely the tires doing most of the shimmying. We took a wheel off, threw it on their Road Force balancer, and sure enough, the wheel is slightly out of round, but the tires were even more so. You could see it on the balancer that the tread was moving around quite a bit. I asked him if the wheels look bad, and he said that the wheels didn't look that bad, and that just new tires would likely help a lot. I believe he looked at the radial run-out, which was 0.06.

Now, I told him that I don't want to shod bent wheels with new tires and have to replace the wheels then pay for mounting/dismounting. He said that he thought the tires would make a noticeable difference. He did say that the tires were very old and very hard, too. (Lesson learned here, actually. I got the BFGs for $250 used. The tread looked tore up a bit, but I figured that it was due to off-road or gravel use; tire guy said it's ozone cracking. I probably should've just bought new.)

Anyway, I decided to try some new tires. I ended up ordering some Kumho Road Venture MT KL71s in 235s. So, we'll see what happens next.

- Andy

Surprised the sidewalls were not all weather/UV cracked for 22 year old tires!

Surprised the sidewalls were not all weather/UV cracked for 22 year old tires!

So was I. I did not want to buy old tires. The sidewalls were surprisingly good, but the tread itself was craggy. The guy that I bought them from a year-and-a-half ago told me there weren't very old. Shame on me for falling for it. I should've went with my gut on that one. Just remember: buyer beware on used tires.

I'm still contemplating buying new steel wheels so I wouldn't have to worry about it at all.

- Andy

I believe the run out tolerance on new aluiminum wheels is 0.05 so your 0.06 doesn't really seem that bad. Hopefully some new rubber will make it better for you.

I believe the run out tolerance on new aluiminum wheels is 0.05 so your 0.06 doesn't really seem that bad. Hopefully some new rubber will make it better for you.

Well that's good to know. I was trying to research tolerances yesterday. This leads to a much deeper discussion on lateral (side to side) and radial (up and down) run out. I think he was measuring the lateral (the .06 number).

- Andy

Well, good news and not-so-good news.



The good news is that the Kumho Road Venture MT KL71s came in. They look great, and I can't wait to take 'em off the pavement.

The bad news: The vibration is still there at 60+. It's not as bad, but it is still there and very noticeable. So, I'd say the last thing to do is get some different wheels.

I will say that under 60, even with MTs, the ride is smoother. The BFGs needed to be replaced anyway (they'd still be find for someone that just goes wheeling or use on a farm, etc.).

- Andy

Not sure if you checked this or if someone already mentioned it, but have you removed and checked your driveshaft and U-Joints?

Check that there is very little play on your transfer case output bearings/slip joint, I thought that changing the pinion angle had solved the noises on mine, but alas it only changed the MPH that they occured(from 55mph to above 65mph) and there is some slop on my slip yoke/output bearing fit.

Rebuilt my drive shaft and had it balanced, that made some difference. Last weekend I had my wheels re-balanced. Pulled off all the hammer on edge weights and had them use stick on weights, only on the inside of the rim. HUGE difference. Smooth running up to 85 mph.

Well, new wheels/tires installed, and the vibration is gone. had it up to about 75, and no more issues. It's as smooth as a lifted Sidekick on MTs is going to get.

I think it was mostly the tires, actually. However, it was time to swap out the wheels anyway. Went to a 15x7 vs. the 15x8s (which I didn't know where 15x8s until the tires were off of them and I saw the stamping).



- Andy