Just turned 100k with no LSD. have tried every Snake Oil technique to revive it. Had been using valvoline synpower 75-90 every 25k, and just assumed it was working. the other day i got really stuck, and noticed only 1 rear wheel was turning. Tried amsoil 85-145? for 1000 miles, no LSD. Switched to the thick cheesy walmart supertech 85-145 with no modifier for 1000 miles, still no LSD. is my rearend trashed? I have pulled some really heavy loads at high speeds, but have never abused the rearend (powerbreaking or doughnuts). . any ideas? any cheap but good lockers out there? Thanks, Lee. .