rear tires
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rear tires
This is going to make me look like a moron but anyway, it happened to me.....
New tires put on 2005 4X4 Excursion Limited V10 last year. About 4000 miles driven total with about 3,000 of those miles pulling my 10,000 lb travel trailer. Never rotated tires during this time.
Brought the truck in for annual state inspection and the tech informed me that the rear driver side tire is an LT245 70R16 and all the rest are LT 265 70R16.
Tire has now been replaced. Rotated all tires putting new one and other rear tire up front. 4X4 has not been used other than to make sure it worked before purchase. Did any damage occur? What can I look forward to. There seems to be no mechanical problems right now. Something tells me there could be excessive differential wear, maybe.
Thanks.
New tires put on 2005 4X4 Excursion Limited V10 last year. About 4000 miles driven total with about 3,000 of those miles pulling my 10,000 lb travel trailer. Never rotated tires during this time.
Brought the truck in for annual state inspection and the tech informed me that the rear driver side tire is an LT245 70R16 and all the rest are LT 265 70R16.
Tire has now been replaced. Rotated all tires putting new one and other rear tire up front. 4X4 has not been used other than to make sure it worked before purchase. Did any damage occur? What can I look forward to. There seems to be no mechanical problems right now. Something tells me there could be excessive differential wear, maybe.
Thanks.
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I'm guessing yes. Very smooth turns. Not sure what code represents limited slip or locker. Sorry I did not mention that above. I never noticed any handling issues. I did notice that my speedometer was a little off at 70MPH, maybe 2-3 mph off but that may have nothing to do with it.
Post Fiend
Joined: Feb 2011
Posts: 26,410
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From: Ft. Lauderdale, FL
Check your drivers door sticker.... Under Axle you will see a number or a C with a number... If you have a letter C with a number you have limited slip. If just number you have an open dif.
If you have limited slip you have been adding some stress to it due to the tire size not being even in height.
If you have an open dif. No problem...
Hope this helps,
If you have limited slip you have been adding some stress to it due to the tire size not being even in height.
If you have an open dif. No problem...
Hope this helps,
Post Fiend
Joined: Feb 2011
Posts: 26,410
Likes: 6
From: Ft. Lauderdale, FL
I think you will be fine, tire height dif. Is very little, think of it as you were driving with one tire low in air. Time will tell, but if your not getting any noises now, I wouldn't lose any sleep over it.
Post Fiend
Joined: Feb 2011
Posts: 26,410
Likes: 6
From: Ft. Lauderdale, FL
BTW.... The speedo according to many here was calibrated at factory for 285/75r/16... I don't know why, that tire size was not an option... But when I went with 285's my speedo is now dead on thru 80mph, checked with my GPS.
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Thanks for your help and insight. Still can't believe I never noticed. I even wash this truck myself. Once the guy told me, I looked at it and although they are pretty close in size, I wondered how I never noticed. He told me that it was the first thing he noticed as he was walking up to it.
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You are right. That is odd. At around 65 - 70 mph mine is off by about 2-1/2 mph checked against my GPS. I like the way the truck looks with 285's. Maybe when these wear out..... Thanks again.
Cargo Master
Joined: Nov 2008
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From: Summit, MS
Many car manufacturers calibrate the speedo off by just a little. Think it keeps them out of legal troubles. Makes you drive slower than you think you are.
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
Having different size tires just means the spider gears are spinning and revolving instead of just revolving which has no effect on the diff. They do spin a little bit due to tires not being exactly the same diameter anyway.
Hotshot
Joined: May 2005
Posts: 13,484
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From: Stevens Point, WI
How many miles at a time did you pull the boat? With a limited slip even a little difference in tire height can cause problems towing something heavy long enough distances. I have had it happen to me so I know it can happen. It was my 89 F250 with 33x12.5 tires, one rear one was wore down pretty good and the other was newer yet. After a long trip I jumped out of the truck to hear my rear end boiling and popping. Not long after that I had to rebuild the LSD with new clutches.