Quote Originally Posted by Rob Liebbe View Post
A friend with a 2500 Duramax 4x4 had a similar problem except the chain that transfers from the main shaft to the front drive shaft developed slack and rubbed against the lower case housing until it wore a hole through it. Of course all the oil drained and ruined the t-case. This also happened while driving back from out west along I-10. I don't know his mileage at the time but it was in the high 100K range. His solution was a reman from GM which he installed himself.
I had that happen on an old Tcase on an 88 ram charger. chain got slack and slapped the case and cracked it...fluid leaked out and burned up the Tcase. sold the truck and washed my hands of it.