The current owner of this Jeep purchased it from the long-time 2nd owner out of Pigeon Forge, TN.  During the previous owner’s tenure, the floorboards received minor rust repair and the exterior was repainted in 2020.  The previous owner had plans to install bedliner in the bed of the truck, but never got around to it- which is why the truck bed still retains its original, rust-free metal in the bed.  The new owner can either install fresh bedliner or paint to match the original Sebring Red paint code.  This Jeep is believed to be a standard J10 short bed truck, but the previous owner added the Honcho decals to give it some more flare and curb appeal.
As far as the transmission is concerned, that whining is typical of straight cut gears, I believe. It would make sense in the acceleration gears would be straight, as they are, I believe, stronger. The fourth gear being quiet is typical of a helical cut gear, which is designed to be quieter, but sacrifices a bit of strength. Since it’s the highway gear, I think engineers do this to satisfy the typical complaint of noise at highway speed, or at least one since it’s an old Jeep, lol. Beautiful old Honcho. I’d love to have it but I only have trades at this time. GLWTA!!!!!