i looked at the rear drive shaft and it looks like theres a screw missing that is ment to be inside the end of he drive shaft cause the fwd side has one in it and when i spin the back wheels the front dont move and when i spin the back wheels the front doesent move and when its runing the front wheels only work but when im at home looking at it trying to find the problem i push the drive shaft closer to the transmision (well thats what i think it is) and spin the back wheels the front move ext but it doesent stay in that spot where 4wd works.  thanks for the help lvh