Originally Posted by
Rob Liebbe
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.
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