I'm currently still racking up the miles on my 2007 LBZ Duramax 2500 SLT Sierra. For my needs of pulling my fifth wheel camper to jobsites all over it does a wonderful job and is virtually bullet proof. I had the trans completely gone through earlier this year after a freak oil cooler line rupture due to a kinked metal line caused by hitting a deer a couple years ago. I had a billet DTC triple disc converter put in as the factory converter is a know weak link. It's been tuned and deleted and gets 17-18 mpg pulling a 31' fifth wheel camper and 22-23 mpg empty.
