Working on a 2000 F-250 4x4, and like the title says, the transmission keeps cracking near the back. Has all new U joints. First time it we pulled it out, found the small hairline crack, took it and had it welded, re installed and it immediately cracked again. Pulled it back out, got a case, switched everything over (upgraded the clutches) and it lasted about a week and cracked near the same spot. Has anybody had or seen any problems like this?? Got another case again, really would like this to be the last one we're putting in this time!