I was at a used car dealer getting a rim for my old Dodge pickup today. I noticed a mid 80's GMC Half ton 4x4 truck sitting there. It has the 6.2 and a 4 speed auto. The cab was in pretty good sape, except for a couple of the rear window panels were missing. The bed's pretty rustyin the fender area. I may go look at it further tomorrow, so I have a few quick questions. 1. What would a rig like this be worth, assuming it runs alright. I don't know the mileage.Tires need replaced. 2. What kind of fuel mileage could I expect out of this thing? 3. How reliable are the automatics in these? I've never owned a Chevy with an automatic, and I've heard many different opinions on these. Also, do these transmissions have a lockup on them? 4. Power-wise how good are these 6.2s? I will tow and haul with it. 5. Is there anything in particular I should look at when I check this thing out? Thanks in advance.