Originally Posted by rcmcr1
If I have a tire go bad and have to get a new one, will I need to replace both on the same axel. Can I use and rotate two different milage tires to the front or rear end with out any problems, or will this cause problems with the differentials?
The short anwer, maybe. It all depends on the tread wear of the tires. You will cause damage by the tires spinning at different speeds due to size if they aren't "close enough" in treadwear.
The long answer. Tire rotation is essential! The numbers are slightly different between manufacturers, but essentially, with the AWD/full time 4wd nature of these vehicles, in order to get a "new tire" if one blows, they need to be within 2/32" of each other in tread depth on the same axle or 4/32" on different axles (front to back) or you will need to replace more than just the one tire. It can and will cause damage to your diff's and trans-axles if you don't.
When this sucks if if your tires are more than half worn, and you have to replace one from say a blow out. New tires are 10/32 or 12/32 new. Half worn tires will be 4-6/32....which is more than 2/32 difference between the tires on the same axle. So you have to replace both on the same axle. Well, those new tires are now more than 4/32 difference from the other axle...now you need to replace those as well. If you don't, you risk damaging your trans axles which costs alot more. See what I mean? It's really a crappy deal.
THis is the same issue that alot of newer cars with AWD are having that people don't realize. Sometimes, if you get a flat, you need to fess up for a full set of new tires rather than just getting one. I worked at a Sears Auto Shop for almost 4 years and had some pretty ticked off customers when I told them that.
I hope this answered your question!