Rear tire extreme wear

[Number4]

When replacing my rear diff I noticed my left rear tire had sever wear on the very edge. As if it was running on the edge. The wear is cupped inward to the wheel.

I’ve never had odd wear patterns from the rear before. Only thing I’ve done of late, was put a Detroit axle rear hub assembly on. Almost exactly a year ago and 17k miles. What besides the new job assembly being made wrong could cause such wear?

It’s only on the drivers rear and only on the inside. They are Goodyear tires, were factory take offs. The only thing on the tire I noticed, is that an 18” section does not have the extreme wear.

 

[wollimann]

Wheel bearing play, inner toe link joints, controlarm bushings, maybe old tires.

 

[FordFlintrock]

Wow! First thought is that tire is rubbing against something. You would have to have about 15-20° negative camber or extreme toe out and would be evident by visual look of tires from the rear comparing side to side. I would still look for worn suspension parts. The thing is if it were a suspension component one would think it should be worn equally around the tire without the 18" patch that is not as worn on the tire.
Which brings us to the part changed a year ago being the hub which needs more investigating, it might be fine off the ground but with the weight of truck who knows? The other thing being the tire itself which was a take off for whatever reason. With tire on vehicle and jacked up give it a spin for running true.
I would swap the tires side to side and see if the problem follows to the left making sure wheel center holes fit over the hub shoulder.

 

[Number4]

Wow! First thought is that tire is rubbing against something. You would have to have about 15-20° negative camber or extreme toe out and would be evident by visual look of tires from the rear comparing side to side. I would still look for worn suspension parts. The thing is if it were a suspension component one would think it should be worn equally around the tire without the 18" patch that is not as worn on the tire.
Which brings us to the part changed a year ago being the hub which needs more investigating, it might be fine off the ground but with the weight of truck who knows? The other thing being the tire itself which was a take off for whatever reason. With tire on vehicle and jacked up give it a spin for running true.
I would swap the tires side to side and see if the problem follows to the left again making sure wheel center holes fit over the hub shoulder.

the 18” portion that’s not worn makes me think it’s a tire failure. But usually a belt separation is visually apparent. If it was the knuckle, I’d think the wear would be constant around the wheel.

I think I will swap rear tires to see if the wear pattern continues.

They were basically new when I got them. But I’ve heard factory (new car) Goodyears aren’t that great.

 

[Josh P]

the 18” portion that’s not worn makes me think it’s a tire failure. But usually a belt separation is visually apparent. If it was the knuckle, I’d think the wear would be constant around the wheel.

I think I will swap rear tires to see if the wear pattern continues.

They were basically new when I got them. But I’ve heard factory (new car) Goodyears aren’t that great.

It's wearing like an alignment issue. On my semi trucks, when the alignment is out, it will wear sections of tire like that, may not wear the entire edge of the tire at once. You could pull the rear tires and measure with the weight on the suspension on jack stands.