Hearing rumors GM and Navistar teaming up ?
If anyone can support this I would love to hear . Read on GMinsidenews they are about to partner with Navistar to start competing in the heavier duty market. The new and improved topcat and kodiac !!
Forum Discussion
The 6.6 is certainly capable of medium duty. They used them in their medium duty trucks from 03 to 08,and I own a 5500 4x4 CC and pull the to max gvw everyday. The new medium duty trucks will have the newer Duramax in them when they release in 2017, not sure what power rating they will have. Likely derated from the 3500
