Ya right, So you are saying you put used tires on that where already cupped?
Do yourself a favor find another shop to look at that rear end.. Never in 30yrs of driving have I seen a solid axle rearend CUP tires. Just saying.. Check into it a bit further..

 

Yeah they were used,forgot to mention that earlier, but they were not cupped when I got them.


I plan on taking it for another opinion. I looked over the rear suspension and still couldnt find anything. Maybe I am calling it wrong and its not cupped, but I have cupped tires before and they are making the same noise as the last time plus it has the divots in it all the way around on the inside edge.

 

Concentrate your search on the housing and not specific suspension parts. A bent housing is hard to spot. Bent housings happen from jacking the rear of the truck from under the center of the rear axle. Housings bend more easily when there is a load in the bed. I've seen it happen several times over my years of wrenching.

 

So you are saying a bend in the carrier housing and not the axle tubes right?

 

No need to make this harder than it is. : ) Think of the whole rear axle assy as just one piece or part in this situation. The whole rear axle housing assy is bent. Most likely the bend is right where one of the axle tubes is pressed into the carrier housing. The best way to check for this is to have an alignment shop that is equipped to check rear wheel thrust angles. The angles on one side (RH) should be complimentary to the angles on the other(LH). In other words they should zero out. This is mostly any alignment shop with a computerized rack these days.

 

Oh ok I got you. I just had that done last week, here is the report.


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Looks like it is at 0 now.

I also wanted to mention that it has a shake between 55-65 that it has had for a while. I swapped the rear tires around and have put a couple hundred miles on it to see if it is just maybe the wheel and so far nothing has shown up on the tire on the passenger side.

 

Tire cupping can also be caused by belt separation. Here is my example almost 3 months ago. These tires are 5+ years old and 50K+ miles. Still good tread on them.



It's not strictly steering components or strictly suspension components. However, they all *can* play a part. Rooting out actual cupping takes some very observant eyes and methods in the process of elimination.

From my read, you had cupping on 2 different sets of tires. There was a first set, then you replaced with used ones....which eventually showed cupping. However, I don't think you've posted a picture of the actual tire(s) that are cupped?

Definitely it is less likely to get *cupping* in the rear...but what the heck, anything can happen.

Currently, you have had an alignment, rotated the tires rear to front, and have a shake. Focus on that shake location, front or rear. The alignment process should have identified any worn steering parts...

For the record, my belt separation was not identified by Discount Tire, Les Schwab Tire, or the Dodge stupidship. An independent mechanic caught it and I still didn't believe it till it popped.....

Not saying this is your situation, but is another (hard to diagnose) symptom.

 

Wh1t3NuKle,

I will try and get a picture up soon, I can feel it but I am not sure how well it will show up on camera. I wish I had a picture of the old tires. With this set it is in the exact same place as the previous set. As for the suspension components, I have replaced upper & lower ball joints, lower control arm bushings, shocks and have replaced the pads and rotors with slotted and drilled. I was chasing down the steering wheel shake for the longest time and found that it was the cotrol arm bushings as per a TSB I found. The rear has been shaking for as long as i can remember, but here over the past few months it is getting a bit worse. I attribute the cupped tires to the shake but maybe I am honestly calling it wrong. This evening after work I will try and get a picture.

 

Yeah the alignment numbers look good. That should rule out a bent rear axle housing. When you mention a shake are you referring to a shake on one of the rear wheels or on the front? You also say you rotated the wheels/tires. Do you still have a shake? If so is it on the same wheel?

 

I didnt fully rotate the tires, i have a gravel drive way and moving the heavy friggin jack around the rocks can be a pain so i moved the passenger rear to the driver side to see if it would do it to the other tire. So far nothing, but yes the shake is still there and it is in the rear. I plan on rotating the tires today if i get a chance and see if it helps.