Harpergreene

I had a set of Black Rhino 22x9.5 wheels and 305/45/22 Toyo Proxys put on my truck about a week ago now. I am getting a vibration at roughly 18-25mph and 48-55mph. The steering wheel does not vibrate, which makes me think it's my driveshaft pinion angle. I had the tires road force balanced 3 separate times, rotated, and even remounted in 4 days and the vibration remains the same.

I had the stock 20' wheels with the stock 275/55/20's and went to 22' wheels with 305/45/22 Toyo Proxys

I also have the crown 2" shackle kit installed, but the vibration issue was there before the shackle kit and remains the same after being lowered.

My truck is a 2wd XLT Screw 5.0 with the 5.5ft bed

Any help would be appreciated.

Harpergreene

This is the difference between my stock setup and how she sits now. This doesn't seem to be a large enough difference to cause a vibration to me, but I don't know what else it could be.

thatdudethere

Why would you even suspect it would be the pinion angle if it did it before you changed the pinion angle?

Try some shims.

If that doesn't fix it, it might be the wheel/tire combo. I've had sets that achieved perfect balance at multiple shops, but still shook the truck. Changed the wheels and/or tires and it went away, inexplicably so.

Harpergreene

It did not vibrate when the truck was 100% stock, the vibration started after the new wheel and tire combo. That is why I thought it could have been the pinion angle. With only .9" overall difference in diameter of the tire compared to stock its just hard for me to believe that's the problem.


I'm just hoping someone on here might have come across the same thing and figured out what it was....

AbitaPro

After market wheels are known to have balance issues, another member posted a thread yesterday, he was ok stock then installed after market wheels and tires.

Did your wheel and tire installer use a bead lockliquid lubricant? Large tires can spin on the wheels after install, causing an unbalanced condition! Very important on large heavy tires, as per Ford Tire installer.

Harpergreene

They did use a lubricant, we went over that as well. I figured after having them rebalanced 3 times, and taking it easy on the tires that wouldn't be an issue. But it is a possibility.

DallasTXF150

The pinion angle shouldn't be affected by tire diameter changes. The axles remain in the relative positions and the driveshaft doesn't change any because of tires. Definitely with lift or level but not just wheel/tire diameter. Only with an actual Change in suspension geometry would the pinion be affected.

I went from stock tires (31.9" to 32.8") to aftermarket and everything is fine. Just sings like an American Idol and on acceleration from a stop there's some vibration from the tires because of the thick block tread.

Although discount tire did say that on one of the wheels they had to add like twice the amount of weight to balance it and it's still not 100% balanced. I don't feel any vibration or noise from that wheel so... dunno.

You don't want to hear it but it's the wheels and tires. They're big and meaty. When they spin the tires on the machine it's not loaded on the ground. With tires that's being compressed on the ground and distorted the balance is different than on the machine. If you're tires are set at a soft psi then driving it could induce some balance issues. Try inflating the tires to a higher psi like 45psi (cold) so that when its warmed up its at 48-49psi. It's a bit stiffer but there's less bend in the rubber.

4js8wh

How long did the road force take?

Dealer or indy shop?

Never had any dealer on any of my vehicles do a true correct and full road force, takes way too much time. Only found out when I started taking the vehicle to an trusted indy after dealer "did" the RF but still had vibrations.

Find an indy shop, give them an extra $40 to buy lunch for the crew, and you'll see they will spend the time to do it all the way. Shouldn't have to but it is what it is especially for KO2 type tires that eat up weights.

My new setup took almost 3 hours to RF with 2 men working solely on it. One tire went from 68 lbs RF down to 7 lbs! Took 5 "turns" and 13 oz weight - this is why most shops turn them once and set you free.

Harpergreene

This was all done at Discount Tire, and it did not take 3 hours, it was more like 1.5hrs.

Harpergreene

They have offered to swap out the tires with a different brand. I was thinking about going with the Nitto NT 420S and see how they feel. If it's the same result, just looks like I'm going to have to live with the vibration.

Thanks again guys for all your help