So, we just got 36 inches of snow here and it was time to dig out the explorer. I put it in 4wd low and drove out of the snow. The next day the wife went out and took the explorer, when she got a couple miles down the road she noticed the O/D off lights flashing and the truck driving sluggish, shifting weird and high rpms. I've noticed a few different answers to this 1. speed sensor 2. Tranny valve body 3. 4wd low engaged and stuck The tranny was rebuilt about 20k miles ago and of course had a 12k mile warranty. I was hoping to replace teh explorer sooner than later, but if I have to dump a lot of money into it, I may not be able to. Any suggestions?