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Old 10-22-2007, 10:15 AM   #1
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Damage from running two different size tires

Hello.
I got two flats yesterday, and had to use my buddies spare. I have a 01 wrangler sport, w/ 31s. So i had to get home with 3-31s and 1-30'' tire. It seemed to drive fine, a little bit of shudder around 55mph.
How likely is this to cause damage? I've driven about 250 miles on it, and will likely have to drive another 100 before I can get patched. any input?

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Old 10-22-2007, 10:24 AM   #2
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your fine the shudder is most likely form unbalanced spares. if your locked on 33 or 35s and have a 31 or smaller then it may hurt something.

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Old 10-22-2007, 02:12 PM   #3
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your fine the shudder is most likely form unbalanced spares. if your locked on 33 or 35s and have a 31 or smaller then it may hurt something.
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Old 10-22-2007, 08:00 PM   #4
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but if its open and i have 35s and i need my 30 to be my spare. its fine? lol
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Old 10-23-2007, 09:25 AM   #5
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why not get a spare to be safe? instead of borrowing all the buddies stuff.
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Old 10-23-2007, 09:56 AM   #6
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why not get a spare to be safe? instead of borrowing all the buddies stuff.
What good would 1 spare do if you had 2 flat tires??
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Old 10-23-2007, 11:00 AM   #7
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Getting home with it is one thing but to put 350 miles on during this is not a very wise thing to do. Mismatching your tire size causes all sorts of problems with brake equilization and is really not a safe idea.
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Old 10-23-2007, 12:47 PM   #8
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What good would 1 spare do if you had 2 flat tires??
1 more tire on the axle
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Old 10-23-2007, 04:45 PM   #9
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you pissed off a woman didn't you, don't lie
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Old 10-23-2007, 04:58 PM   #10
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is 1 inch really going to make that much of a difference?
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Old 10-23-2007, 05:26 PM   #11
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is 1 inch really going to make that much of a difference?
For braking, yes. If it was an ABS vehicle, he would have answered his own question by driving it, but since most jeeps aren't, he wont notice untill he needs to lock them tires up Its also not real good for the differential, let alone if he puts it in 4wd
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Old 10-23-2007, 05:32 PM   #12
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if your just trying to limp home on it. you should be ok.. the issue comes off-road, if you need your spare off road remeber you got there with four tires of the same size and same tread your trying to get out with something else. It can be a problem
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Old 10-23-2007, 05:34 PM   #13
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For braking, yes. If it was an ABS vehicle, he would have answered his own question by driving it, but since most jeeps aren't, he wont notice untill he needs to lock them tires up Its also not real good for the differential, let alone if he puts it in 4wd
1" is not going to make any difference.

Mounting 30s on the front and 44s on the back would be nasty time for the tcase though.
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Old 10-24-2007, 05:21 PM   #14
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While repairing the tires, mechanic said he heard a little grinding from the rear diff. I didn't. He said his ears are 'in tune'.(to cash register?) I didn't tell him the tires were different size, I imagine he noticed though. From what people have said here it sounds like this likely is not from running the two sizes. Is is worth worrying about it? How likely is it to give me problems. I tend to think it's nothing. opinions?
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Old 10-24-2007, 05:31 PM   #15
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He said his ears are 'in tune'.(to cash register?)
ROFL!! That is mostly true when dealing with mechanics. Just do what I did, marry one!
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Old 10-24-2007, 05:51 PM   #16
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Quote:
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He said his ears are 'in tune'.(to cash register?)

Let me gues he said you need a new dif?
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Old 10-24-2007, 06:23 PM   #17
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new bearings once it goes. Two days 1100.
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Old 10-24-2007, 06:31 PM   #18
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new bearings once it goes. Two days 1100.
haha, those bearing must be with diamonds on them... if i'm correct get the clear gearz cover so you can show off hahahah
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Old 10-24-2007, 06:57 PM   #19
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While repairing the tires, mechanic said he heard a little grinding from the rear diff. I didn't. He said his ears are 'in tune'.(to cash register?) I didn't tell him the tires were different size, I imagine he noticed though. From what people have said here it sounds like this likely is not from running the two sizes. Is is worth worrying about it? How likely is it to give me problems. I tend to think it's nothing. opinions?
Tell the mechanic it was his stomach rumbling and that he is a moron.


or just drain the fluid and see what comes out
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Old 10-24-2007, 07:43 PM   #20
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or just drain the fluid and see what comes out
Hopefully not little metal pieces like from Dereks diff.
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Old 10-24-2007, 07:49 PM   #21
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Tell the mechanic it was his stomach rumbling and that he is a moron:
I agree with that. I hear nothing and it runs fine. I think I'll wait for catastrophic failure.

for what its worth: what is a reasonable cost to get it repaired? I'm no mechanic
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Old 10-24-2007, 07:56 PM   #22
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I agree with that. I hear nothing and it runs fine. I think I'll wait for catastrophic failure.

for what its worth: what is a reasonable cost to get it repaired? I'm no mechanic
To get a rear end torn down and re-built? I'd say 500-600 is a very fair estimation.
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Old 10-24-2007, 09:09 PM   #23
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thanks for the insight guys
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Old 10-25-2007, 07:37 AM   #24
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For small differences, you should be okay, but keep it slow enough. Do NOT put it in 4wd or lock it.
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Old 10-25-2007, 08:03 AM   #25
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I had to do the same before. I wouldn't use it for long hauls though might cause bearing issues. Where did you get a hole in your old tires. Can't you get one of them patched? It would be a lot cheaper on the wallet to do that.
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Old 10-25-2007, 08:28 AM   #26
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Quote:
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I agree with that. I hear nothing and it runs fine. I think I'll wait for catastrophic failure.

for what its worth: what is a reasonable cost to get it repaired? I'm no mechanic
Changing differential fluid is very easy and you can see for yourself if there's a problem.
Don't wait till there's a problem, that's when it gets really expensive.

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