Hi, I have a 1995 F-150, 4x4 with extended cab. Currently the 4x4 does not work as a mechanic I took the truck to did something to break the 4x4 when I was frustrated with his fix on a seatbelt adjusment. The 4x4 does not engage when the button is pressed and when I first got the truck back, it was stuck in 4x4. The fuses are fine, the transfer case is in good condition, but no other mechanic has been able to find the problem. What are the possible things that could have been done to break the 4x4 connection? And where can I look to check out possible issues? -Thanks!