I have the exact same truck. Bought it with a smoked auto gearbox. So I sold the big block junk so it would finish paying off the truck it came out of, stuffed in a fresh and tight 350 with a nv4500 behind it. Added a pto so it dumps and drives auxiliary snap couplers for my other hydraulic goodies I pull.
I do everything in overdrive for past 10 years, and still do. Still the same engine, gearbox and , same junkyard clutch I stuffed in it. Flywheel I found laying in the dirt was nasty rusty, so I sandblasted first.
It's all how you run it, not what you put in it.
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