So I know the tires on the jeep have to be the same size, as if one were smaller it would be turning faster causing strain on the diff and t-case.

On a small car if one tire was almost worn out and one was new it would be barely noticable but a worn out 35(true 35") is comparible to a new 33".

now here is my question. I have 285/70r17 all four are evenly worn and rotated every 10k.

this weekend I cut the side wall on one of them and my spare is a 285/70/17 as well but less then half the tread and the others I would say the are more than half. I will measure tomorrow with a tread depth gage.

so is there a rule of thumb as to how many 32nd's difference you can have or a percentagedidiffference???

Oh yah all the same brand tire

 

Great question. I know that on some all wheel drive systems if you damage a tire you have to replace all four because it will mess with the computer. I'm interested in seeing what is said.

 

How small istoo small?

She will tell you

 

I don't think it would matter that much unless you have lockers engaged. Only 1 wheel per axel gets power at any given time. Although I would like to know as well.

 

I was in the pool, I was in the pool

 

I've heard from one dealer that 3/32" difference in tread depth is the max otherwise the differential has to work too much (like continuously driving in a circle).

 

Shrinkage!
Too funny

 

I had a similar experience except with a valve stem shearing. My spare is ~1/8-1/6" higher than any of my other tires. I've been driving that way for 4000+miles and no noticeable difference so far