I CAN'T GET MY 4 WHEEL DRIVE TO ENGAGE, SHIFTER MOVES, I'VE CHECKED VACCUM LINES, GOT THAT DOWN TO VACUUM SHIFT MOTOR, NIPPLES ON SHIFT MOTOR ARE RUSTED AWAY PRETTY BAD, STILL WORKED LAST YEAR, JUST HAD TO KEEP RE HOOKING THEM ON. BUT NOW YOU HEAR NO CLUNK OF FRONT AXLE LOCKING IN. I JUST WANT TO MAKE SURE THAT MOTOR IS THE PROBLEM BEFORE I GO AND SPEND MORE MONEY, I JUST GOT DONE SPENDING 750 ON ROTORS, PADS, FRONT RIGHT WHEEL BEARING(200 BUCKS ALONE) AND REAR WHEEL CYLINDERS. COULD IT HAVE ANYTHING TO DO WHEN THEY CHANGED RIGHT FRONT WHEEL BEARING HUB. SNOWS ON THE WAY AND I WOULD APPRECIATE ANY ADVICE. THANKS