here is the deal, bought this truck earlier this year from a good friend. tried 4wd in 4h and 4l at time of purchase and everything worked great. Been about 2 to 3 months and just tried to use 4h today to no avail, truck simply sits there and free revs, it will not engage tranny will not move truck like 4h gear is gone entirely. pushed the lever forward to 4l and 4wd works great, engages fine tranny moves truck and all is well in 4l and 2h. still no 4h though??? what the hell is the problem with this piece of junk? any help would be greatly appreciated, have checked linkage, its fine and can't find anything else wrong. Thank you in advance.