Originally Posted by
shownomercy
2006 models. Duramax LLY. Has the potential for shoddy HG and weak head bolts, also tends to overheat if pulling full GCWR. But, I do not think a H1 can tow as much as the motor can so you should be fine unless someone put a big tune on her. Trans is good for "maybe" an additional 100hp over factory but you play with fire above that.
And nothing is cheap to replace/fix, think corvette tax but double [emoji38]
Whats interesting is if its an 06 engine, which means LBZ, which is like the LS1 on that family line. Few articles say LLY but 06 was LBZ so who knows.