I have been burning through rear tires like crazy. I get maybe 1000 miles from a set of good used tires before there are wires showing. I refuse to buy new tires until I figure it out.
They wearing on the inside edges(camber wear). I've been under the car and can't see anything obvious or loose.

Relevant things to mention, shocks were replaced last year, running 17'' mustang rims with centering rings.
There is a light vibration coming from the rear and I haven't been able to figure out what it was. I found that my driveshaft bolts were loose/missing, and that's been addressed but there is still something going on back there. Like I said, can't feel/see anything obvious under the car. I'll be taking the car to get a full alignment tonight, but as far as I know the only factory adjustment in the rear is toe in/out.

Attached is a pic of what my wear looks like. It's not my pic, but it's identical to how my tires are wearing. Thanks for any advice.

 

Stop doing burnouts :P

Is the car lowered? You might need to get camber adjusters.

 

check your toe bushings..hell!,all bushings.

 

first stop should have been an alignment shop to see exactly whats off

 

I'm pretty easy on her actually. Stock ride height too.


Going tonight, just wanted to get an idea if this was a common issue, what to look for etc. My old man works at NTB, they have an alignment rack in the shop so ill be under the car while the work is being done.


I replaced the bushings on the toe adjusters when I did the shocks last year also.

 

ever hit a curb? lateral link could bent

 

Nope. No accidents.

 

It's your wheels. With you having wider wheels with spacers it is putting your wheels out more putting most of the weight on the inside edge of the tire. . I've been an alignment tech about three years.

 

I don't have spacers, they are just the plastic rings that go around the hub the keep the rims centered.

 

Sorry I miss read that but still with your wheels being kicked out more it is me allowing the vechicles weight over center section of the tread width.

 

Why doesn't anyone else have this issue then? Hundreds of people on these boards run a wider than stock wheel and tire combo.

My fronts are the same, and they've been on the car for a year and a half with better than normal wear.

 

Alignment with weight in car. Many guys are using specs with their suspension manufactures sent them. Your using stock specs which include stock height, weight, wheels, and tire size.

 

you need to have the alignment of the car checked, otherwise you are just guessing.

 

i would check the rear steer bushings before the alignment.

jack up the car and push/pull the wheel horizontally/vertically to see if there is any play in any direction. if there is horizontal play then the DTSS bushings are probably gone.

wider/more offset wheels do not create this problem, worn components do. i have 285X9.5 +35s on my car and there is no discernable amount of additional wear.

 

Toe related problems are about the only thing that can shred tires that fast, well except non stop burn outs. Camber will cause faster inside wear but no where near 1000 miles a set of tires bad.

 

keep in mind he is starting with used tires, so this isn't 1000miles from new, its 1000 miles from ???

 

Sitting on the alignment rack now. Rear toe was pretty far off but is good now. Camber is still way out, but nothing seems loose or damaged under the car.

 

is it lowered? lowering the car adds negative camber

 

Answered already. No.

Seeing as the camber is out equally on both sides, I think I'm going to install the adjustment rod from Mazdatrix. Hope that solves it...

All the rear vibration disappeared after fixing the toe, it's like night and day difference. Still got some upfront, that's from a blown shock and one bad tie rod end.

 

Vibration makes sense because it is putting the rear axles in a bind. How far out? Post your specs

 

Mine doesn't wear the rears out quite that fast, but with 133,000 on it the rear camber was right around -1.9 degrees. That's on a 90 GXL with stock AAS. I'm planning on going in and replacing the DTSS bushings and adding in an adjustable camber link.

 

it's probably solely due to the toe in the rear. contrary to popular belief camber doesn't really add a lot of wear. I run -2* in the rear and don't wear the rears unevenly at all.

 

if the tires roll straight the wear is minimal from camber/caster out of adjustment.

if the tires 'snow plow'(toe out of adjustment) then the wear can be quite dramatic to the inside or outside edges of the tires because they drag across the surface.