What Can Cause Uneven Tire Wear 8 3/4 posi ?

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stroker402

stroker402

1968 dart GTS convertible
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I noticed on several hipo mopars I owned over the years with 8 3/4 rear end posi , that the left rear tire will wear down faster than the pass side . Is it because with the torque of the body it shifts the weight off the drv rear tire and plants the pass tires harder to the pavement so it has less friction? your opinions please.
 
One of my jobs over the years was taking care of a fleet of tractor trailers. Tire cost was always a hot topic so extreeme vigilance was needed.

I can tell you for sure if you left the tires alone, the left side always wore faster then the right. Always!

My unscientific study says it was due the the crown built into the roads for water runoff. IMHO
 
do to the way i drive my 4 speed , I beat on it every time I take it out so there is a lot of friction going on there spinning. not just a normal cruise (rolling tires) . lol .
 
stroker402 said:
I noticed on several hipo mopars I owned over the years with 8 3/4 rear end posi , that the left rear tire will wear down faster than the pass side . Is it because with the torque of the body it shifts the weight off the drv rear tire and plants the pass tires harder to the pavement so it has less friction? your opinions please.
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I've never heard of an 8 3/4 posi in a Mopar.
The ones i've always had were sure grips.
It must have been a lot of work and expense to convert the center section to a Chevy's guts.
Is it better?
 
I just measured the tread depth on my 8 1/4 open rear end (2.93) tires and in my case the passenger side has less tread left than the driver's side.

As a young adult driving a hand-me-down 1969 Chevy pick-up truck (350 auto/open differential) I used to wear the rear passenger side tire smooth because going around right corners it would slip/spin because I pressed on the accelerator too soon (on purpose-Dad paid for the tires).
 
Sure grip senses an imbalance in the 2 axles rotation by the cone and helix system in a cone setup. When one side overruns the other the cone unwinds and puts more pressure on the opposite axle and that usually gets them back In sync. That would prevent a one tire in the bleach box burn out. Clutch sg may work on a different principle but the road crown would be a tough one to justify mechanically. In the fsm they tell you to adjust the ride height when you are seated in the driver seat, perhaps that 200 lbs on the driver side is enough to cause more wear? My trucks fuel tank is on the driver side too and that has a mean lean on it when it's parkes. But I think the frame or the box is bent anyway.
 
Even with a spool, if I didn't swap my slicks from side to side periodically, they would not wear evenly. For many years now, I swap them after every weekend of racing and touch up my rear brakes while I'm at it. Glaze build-up on the pads reduces holding power.
 
Locomotion said:
Even with a spool, if I didn't swap my slicks from side to side periodically, they would not wear evenly. For many years now, I swap them after every weekend of racing and touch up my rear brakes while I'm at it. Glaze build-up on the pads reduces holding power.
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That's what I am talking about . like locomotion said ...even with slicks on, they would wear unevenly. I've built a few race cars in my time and slicks wore unevenly for me also. works the same for street tires too.
 
Our big asses are sitting alone on left side of the car 99% of time adding unequal weight distribution. LOL.
 
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