You know what...I bet someone took the suspension from a newer GM 3500HD and swapped it into that truck. Those 3500HD's had the exact same 5 lug front/10 lug rear as that truck (they also had the ugly grey plastic grille extension above the bumper, with 3 rows of vent holes). they used a dana 80 rear axle, and some of the newer ones had discs, iirc. pretty sweet!
I have to disagree that its a H110...in the one pic I can see what kinda looks like a bolt holding the diff cover on, which the H110's didnt have.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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