I an selling my old silverado 4 x 4 since i got my tj. (Too many vehicles). I have a 2002 gmc sierra 2500hd 8.1 allison with 14 bolt full floater with 4:10 gears. It is an open differential. It tows awsome. The problem is when i get back from camping i dont think it will back the camper up a small incline into the garage. The driveway is gravel, thats where the problem starts. The 4 x 4 walks it right in. Do you guys think i could put a locker in. I love the truck.and would hate to sell it. I have looked in my area for a replacement axle but have not found one.