I can see the info about unequal size tires damaging the t-case or transmission on an automatic. So, the other day, I got a flat, put the emergency spare on, and put the fuse in the FWD socket. They couldn't fix the tire (it was wearing out anyway - see my other post on tires) so they put a used tire on that was of a different make (although it is the same size: P205/70R15).
(And yes, I know used tires aren't a good idea, but I'm in the middle of nowhere, there aren't any tire stores around, and I'm going to be in a big city in a few days and I'll be able to replace all the tires then. I just needed something to get me back on the road.)
Just for the hell of it, I decided NOT to take out the fuse in the FWD well, basically to see if running my car in FWD only would yield any better mileage. But if this info on the damage to the t-case is correct, then it may be a good idea for me to leave the FWD fuse in place until I can replace all 4 tires, since we all know that different manufacturers can sometimes have different diameters in tires that are of the same nominal 'size'. Is that right? If so I guess I did the right thing for the wrong reason.
Martin