Duramax 6.6 TD ??

John,try Patrol 4x4 forum as well,many have done conversions,some duramax,good luck

Looked into it for my gu if done well they are great but the cost is expensive theres a guy in Brisbane that does one of the best conversions I have seen but so it should at $50,000 to $60,000

There's a mob called PID Diesel who I've seen mentioned on LCOOL forum as being someone who does these conversions. Jump on Patrol 4x4 forum or LCOOL forum and search the name Killalux, he does the conversion also and is the guy a lot of people use to get their wiring looms done.

http://www.brunswickdiesels.com.au/index.html

This Ebay ad will give you a link to the guy at Pomona on the Sunshine Coast that specialises in this conversion:

http://www.ebay.com.au/itm/Duramax-Allison-Engine-conversion-Nissan-GU-patrol-Landcruiser-100-80-/251426019455

Cheers