I'm building vehicle for heavy off-road application. The project aims to develop assemblies as well as a whole new multi-purpose vehicle adapted for operation in extremely hard terrain conditions (military training ground, places, rail and air accidents). The problem is that I do not know the US market that is why I need your help. I need the diesel engine which can run other with manual or automatic gear box. Not long ago I wanted to buy 6.5L Military Peninsular engine but it can only run with GM 4L-85E automatic transmission. The second problem was the 4L-85E has a “narrow” gear ratios. That is why I decided to buy a Duramax engine. I do not know what generation of Duramax I should buy (LB7 or LLY – both of them can run with Allison 1000 or ZF-6 ZF S6-650). Are there any company’s similar to Peninsular where I can buy a Duramax engine tuned for heavy off-road application?