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Discussion Starter #1
Truck in avatar / signature. ford 9" full spool 4.56:1 slide-a-links.

left rear tire is wearing faster than right rear, both are wearing flat and even, but left is wearing faster than right. tires are MT ET Streets 28x13.50x15. any suggestions as to what is causing it? It is the second set in as many to years to wear this way. Truck has been inconsistent this year with ET's moving around as much as .1 within a day.

I am posting this in two other spots on YB to maximize exposure and answers.

Left Tire




Right tire




Four corner scale numbers



Please don't focus on four corner scales unless you have personal experience with scales.
 

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Discussion Starter #2
The white marks on the tires are from the gravel it drove through before the tires were taken off, there's a little grass on there too.
 

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MFI on CH3OH
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Rotate them after ever meet. You dont want me to comment on your rear side to side weight bias issue so i wont....................
 

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Get a 4 wheel alignment check. Maybe the left is toed in or out slightly causing a slight scalping.
 

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Regardless of the scale readings. Swapping the tires side to side every 10 passes will even out the wear rate between the tires. The chassis setup will then dictate how quickly the tires wear.
 

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Does the truck launch straight? How much power is it making and the ET?
 

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MFI on CH3OH
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Ok so i read the whole post properly.
Is the Diff square in the car ?
Is the diff straight ? both back to front and up and down ?
 

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The scales tell you the answer.......and yes I have plenty experience with them.
THIS^^^And I have plenty of experience with them also. A little more cross weight (wedge) and you'll have a circle track setup.
 

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"PRES."(Jus Sayin CREW)
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My truck did that, I installed upper roll control, and that took care of it....
I also rotatr after every race weekend, and make sure you have the
Right width rims for what the tire calls for....
 

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Discussion Starter #12
Something that i will have to verify, thank you for the post.

Ok so i read the whole post properly.
Is the Diff square in the car ?
Is the diff straight ? both back to front and up and down ?
 

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Discussion Starter #13
I plan on rotating the tires afrom now on. what is upper roll control?

My truck did that, I installed upper roll control, and that took care of it....
I also rotatr after every race weekend, and make sure you have the
Right width rims for what the tire calls for....
 

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Discussion Starter #14 (Edited)
It does launch straight now. earlier in the year it was pulling right, i would just steer it a little, a week or two ago, i added preload to the left rear tire and now it goes straight. between 500 and 600hp, runs 10.70's good air, and 11.0X bad air.

Does the truck launch straight? How much power is it making and the ET?
 

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Discussion Starter #15
Here's a larger photo of a launch

 

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It does launch straight now. earlier in the year it was pulling right, i would just steer it a little, a week or two ago, i added preload to the left rear tire and now it goes straight. between 500 and 600hp, runs 10.70's good air, and 11.0X bad air.


That would make it drive to the right harder.


Even up the rear weights......at 500 hp you will be fine.....unless you have another hidden issue.
 

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Discussion Starter #17
Correction, it was pulling left. Added preload to the left and it straightened out.
That would make it drive to the right harder.


Even up the rear weights......at 500 hp you will be fine.....unless you have another hidden issue.
 

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pist'n Broke
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Gotta ask, were the axle tubes welded...maybe that side twisted...I know this will cause dog walk...but maybe make the tires wear different..
 

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"PRES."(Jus Sayin CREW)
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I plan on rotating the tires afrom now on. what is upper roll control?
It's upper anti roll, it keeps your vehicle from twisting.
My truck used to lift left front tires two feet more than
The right, now they both come up equally..... Made a big
Difference in launching, and going straight.
 
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