Full story - Jamul, southern Cali / Somewhere in Arizona. Bought it earlier this year looking to take a rust free project home with me when i get out of the Navy. Months of being picky on facebook marketplace had me reminiscing my high school truck sitting in my parent's yard, when i saw a blue, 89 Extended cab, 4x4 dually 1 ton with a 454/400TH. Two windshield cracks, one spot of roof rust, and an aftermarket steering wheel, otherwise mint and entirely unmolested at 106k miles. Fella on the edge of retirement now that he had bought his eleventh house had used it to haul hay for a horse at some point, and otherwise it was dailied to a government desk job or parked. It has been resprayed. Didn't know he was the first owner until i got home and the booklet turned out to be warranty info, not a manual, with his name, purchase date 18 SEP 1989, and mileage at delivery: 36. He mentioned replacing the transmission, it's an allison branded 400TH from what i can tell, but he mentioned nothing of the axle, and front hubs seem to match it. Patina seems the same from the under bed to the axle so if it was swapped it was done very early in it's life. Only other thing i've found is that the heater core hose has been cut and plugged at each end... so i can only assume it was leaking. That'll be as fun as driving it cross country next spring.
Also, It's looking like it's actually a 5/8 x 18... it seemed to thread on a little easier than m16, which went about 3/4 inches onto the stud i tried before it started to bind, assuming the patterns are so close they're deceivingly close to interchangeable. I was in a hurry. I'll update when the set of nuts i ordered shows up.
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