Picked up a Eddie Bauer edition bronc2 notice the 4x4 isn't working the push button lights come on. I happen to jack the rear end up to check my rear u joint well I forgot about the jack and tried to pull forward(obviously) rear tires spun so I put it in 4x4 and lights came on and it won't engage? The front drive shaft spins but not locking in the front. Any help would be appreciated