Okay, I took it upon myself to email the guy and ask some questions!
Below is the email I sent - I'll let you know what response I get!!!!
I saw your ad on Craigslist and wanted to get some more info -
What exactly is the truck - Chevy, Ford, Dodge????
And what are the specs on the tires? 38X What?? And what type of wheels?
Also, what gears are you running in it? And are the axles original to the truck or what are they out of? I've heard of a Dana 30, Dana 35, Dana 44 & a Dana 60 but never a Dana 90 - so I wanted to get some info on that.