Loved my '78 Ramcharger, so seeing your model brings back lots of good memories.
Make sure you repack the front wheel bearings. They made 2 styles. One was a manual repacking that took forever as you needed to remove hub and brake calipers, which gave you a good look at how brake pads are doing and the other was, if you remove the tire/wheel and rotate the hub, you'll see a hole in the brake rotor. If you look through the hole and see a zerk fitting somewhere within, at top/back/front(don't remember where located, you can repack front bearings with some squirts of good wheel bearing grease. I used synthetic grease on mine with good results.
Just remember, those 360's aren't know, for good gas milage. You might get 12mpg with what you have.
Also, with the manual hi/lo/neutral shifter, DON'T put the truck in Park and then shift the other to the neutral position, thinking the vehicle is still held by the transmission in park. It will still release the truck's transfer case to be totally freewheeling and truck will roll on it's own.
Also, if yours is stubborn like my Ramcharger was, you might need to shut down the engine to shift transfer case to Lo/Lo range. For Hi transfer to lock in the front diff, you could do it on the fly at up to 40-50mph, but I never went over 30 when I shifted mine into Hi 4-wheel when needed.
Del & Jerre w/Isis our English Bull Terrier
The Cougar's Den
1984 Fleetwood Prowler "E"