On my 93 1 ton,it felt like the 4 wheel drive wasn't quite working correctly. I put jack stands under the front and rear,then proceded to test the truck in and out of 4x4. Everything works fine in 2 wheel drive,but when shifted into 4x4,the back and only front left tire are working. I manually turned the right side while it was supposed to be turning,but nothing really happened,it never spun like it should have. Before you ask,yes both lockouts were locked. It did not seem like the right side lockout did not "snap" when I flipped it into 4x4. Is this my problem?Could it possibly not be locking the axle shaft into 4x4 when I lock in the lockout?Is this a common problem?