Ok, so i'm driving down 40 and I notice my tcase jump, but thats it. Nothing was noticable in the way the truck was driving. Then..... about 5 miles later it the tcase starts making a clanking sound (kinda sounded like a chain slapping around) and jumping. Then I lose power to the rear wheels. So, I figure the chain broke. Called a roll back, blah blah blah. Anyway its at home now. Here is when it gets fishy. I went outside to check it out couple hours after I was home, and lo and behold them damn think is working fine. I haven't put it in 4lo yet. I wanted to see what you guys say first. Whataya think?