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Old 07-03-2001, 03:49 PM   #1
Layman
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Question Uneven tire wear and AWD...

I know this has been asked before (actually, I think I asked ), but I did a search and couldn't find anything.

If I have uneven wear front to back (not side to side) will the center differential be negatively affected? Basically, my front tires have ~25k miles on them while my rears have ~12k miles. They are all stock tires, though.

Basically, what are the tolerances of the LSDs in a 2001 RS?

Thanks in advance.
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Old 07-03-2001, 04:17 PM   #2
DigDug
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Are you referring to the difference in diameter due to more worn tires on one end? This is not going to hurt your center diff.
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Old 07-03-2001, 04:20 PM   #3
Layman
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That's exactly what I talking about.

Can you explain why it won't hurt the dif? In my mind, it would make it look like the fronts (more bald) are slipping.

Is it just within the tolerances of the diff?

Thanks for the reply, BTW.
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Old 07-03-2001, 04:54 PM   #4
DigDug
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Oh, you're referring to grip rather than diameter. No, that won't be a problem either. The worn tires will grip just as much as the newer tires (especially with the RE92's!) in normal conditions. When you are pushing the car harder, or are in adverse conditions, the fronts may not hold as well as the rears, but the center diff won't burn up, because you really wouldn't be subjecting the diff to slippage for extended periods of time (unless you're doing donuts in a parking lot for like 15 minutes continuously ). For reference, I replace tires in pairs, not entire sets. Each time I put the new tires on the fronts, and move the current fronts to the rear, so at any given time, I have a difference of about 10-15k miles of wear from front to back. It took me some time to get into this cycle, where the rears are the more worn at any given time, and the fronts have enough tread when I replace them to make for good tires in the rear.

The diff can take it, don't worry about it. You can be pretty hard on the stock center diff, and it holds up well.
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Old 07-03-2001, 05:31 PM   #5
Layman
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Cool. I was actually talking about diameter difference (by blad I meant less tread/lower diameter), but you answered my question anyhow.

Thanks a lot.
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Old 07-05-2001, 03:14 PM   #6
Stanley
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I've had a different experience than DigDug, although not with a Subaru...
I owned a 1989 325iX (full time AWD E30 body). The rear tires were significantly more worn than the fronts when I bought the car. Transfer case on the thing fried at 70,000 miles and the mechanic said he was 90% sure the reason was uneven tire wear front to back. The difference in diameter, on the BMW anyway, cost me about $4,000!!! You can buy quite a few sets of tires for that kind of coin!!!
Again, this was a different make, the transfer cas on the iX was a known weak link and the Subaru may have more forgiving tolerances. However, in the manual for my WRX, it makes a point of the importance of rotating tires. If I were you I'd go get a matched set of 4 new tires for your car and rotate them regularly. A tire shop will usually rotate them for free if you buy a set of four from them.
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Old 07-05-2001, 07:18 PM   #7
D
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Default Tire Wear?

Sorry, a bit of a thread hijack here.
I've been driving my car relatively hard and noticed that my rears are more worn then my fronts... it's kinda odd cause I don't exactly go for the tire screeching driving bit, but maybe I just don't notice it w/ the radio on.

however, my diff seems to be clunking a lot more when I shift... it may be because I've gotten a bit sloppier shifting, but when I shift 1-2 and 2-3 it clunks unless I'm super gentle with the clutch... I'm wondering if this is because the rears are slipping a bit. Either way, I'll be rotating my tires soon.

thx
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Old 07-05-2001, 07:50 PM   #8
SubyTechMaster
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Measure your tires! If you have more than 1/4" differance between the smallest and largest you WILL have problems. The best way to avoid this is to rotate your tires frequently, I do it with every oil change (3500 miles).
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