Hey, I know I'm new here, but I searched through and didn't find quite the same problem as I'm having in another thread.

So after getting home last night and having a lot of trouble backing into the driveway, having a serious loss of power, I take it out today and find that the truck is rocking from side to side as I drive, a bit like a boat in rough water. Further, I wasn't able to get much power out of it, capping about 20mph/30kph. Reversing produced some ugly grinding or scraping noises. The steering wheel swung very quickly back to its neutral position after turning, and I've noticed a strip on the road near the driveway where I apparently spun one of the tires trying to back in. Some quick searching says it could be a wheel bearing, an axle problem or suspension-related. Has anyone here seen this kind of thing before?

 

First thing I suggest you do is confirm the parking brake is not set. Next would be to jack up the rear end and see if one of the wheels does not spin freely (probably the one that left the skid mark (versus spinning). If the parking brake is not set and one wheel is seized, you probably have a seized up parking brake system on one side. It could be the cable, but your generation of Explorer has a tendency to shed the friction material off of the parking brake shoes. When that happens, the friction material could get wedged between the mechanical brakes and the drum causing the wheel to lock up.

-Rod