The starter grounds by virtue of it's metal base being mounted.

I thought I've heard of rust or oil leaks that caused problems in that area.

If you negative cable to the block is new, clean, and tight you should be starting to look good for that circuit.

 

I don't know if such an animal exists on these trucks.

If it exists and it's still there it would have to hook onto one of the bolts on the starter OR go onto one of the bolts that hold the starter to the transmission. The other end would have to bolt somewhere on the block.

Such a ground shouldn't be needed because the the transmission bolts to the block and grounds by the transmission hugging the block as well as the bolts going through the transmission housing to the block.

The bottom line is I doubt if there is such a thing on your truck, but I could be wrong.

 

Sometimes folks get carried away with paint during restorations, the starter grounds itself through the mounting boss on the block. Clean bright and shiny tight won't hurt anything here. Fresh, heavy duty cables and grinding through the grime and corrosion before connecting makes a big difference in both starting and charging. Then check for voltage drop with a DVM set on its lowest setting. Nothing should exceed a few tenths anywhere. Here's how it's done, a little different procedure than people might think. You could check, if you wanted, for any voltage drop between starter and block for example.

http://www.aa1car.com/library/voltage_drop_testing.htm

 

I'd go along with that being as I can't see anything that grounds except the base of the starter. I bought a brand new starter so it hopefully will work better than the reman. Thank you for your responses and I'll let you know how it turns out after this.