Thanks. We think it looks pretty good too. Observations: We do mostly in town driving. We get about 16mpg when doing so. I don't have a good number on longer, open road, type trips. We haven't done many of those. The fleet manager who ordered for us (Michael Hohl Chevy, Carson City Nevada) said he sold several of these setups to a local company and they were reporting 24/25+mpg. He mentioned the owner of the company like them so much that he slowly started replacing all is old van's with the new 2.8L Duramax setup.
I don't know about shocks but I will look into it. We did the conversion at Advanced 4x4 in Salt Lake City. They were great and nothing they did voids and of GM's warranties. Here is some info on them as well as a list of things they do on GM van conversions.
GM 4x4 Van Conversion - Advanced 4X4 Vans
GM 9.25” IFS Front Differential 1
Heavy Duty 2 Speed HI-LO Transfer Case
Shift on the Fly 4×4 Front Engagement System
Spicer Front and Rear Drivelines
Heavy Duty GM Torsion Bar Front Suspension
In-dash 4X4 Indicator Light
Visor Mounted 4×4 Operation Placard
Maintains Factory GM Stabilitrak and ABS Systems
0 to 3 Inch Lift
Due to gear ratio incompatibilities, all 2008 and newer GM vans with the Duramax Diesel will require a rear gear ratio change to 3.73.