QUESTION:
when I start down a long mountain, what gear selection do I make, what is going to help me hold that load back???????????
I have heard that the diesel engine has little to no braking ability, so do I just ride the brakes until I go over the mountain side when the brakes get hot and go,
To make a long story short; compression. It takes a lot of energy to compress a 16 to 22 to 1 piston. And if your foot is off of the go pedal there is no bang in the cylinder so your trying to compress a lot of air and the down hill grade energy is doing that.
When my dad bought his 93 diesel he was going to take a trip to Alaska and was freaked about doing it because of the same old tired stories he heard about diesels. When he got back he said that those people don't know what they are talking about. He said it held back better than my old truck. (Which was a gas small block with 3 speed auto). Remember, this is with an old 4 speed diesel with no TH or anything like that.
In short, you have nothing to worry about. Stick it in TH and drive it how fast or slow you want to go.