When any vehicle won't go into drive it is a transmission problem.
Go to a truck driving school. You're not going to learn how to drive a Class 8 truck by reading about it on this website.
Get a truck/SUV with 4x4 and go find some mud to drive through and get your truck dirty.
You go to an actual truck driving school.
You go to a truck driving school and learn how to drive a truck.
Someone who knows how to drive a truck and is legally licensed to drive a truck has to train you, so that you can drive a truck (but you do also have to get a license).
Go and drive and get there
first thing to do is check the transmission fluid
When you buy, you can drive the truck as much as you want. But, when you lease a truck, you are only allowed to drive up to a certain mileage, and if you go past that, it will really add up in cost.
Not necessarily, however you do need a commercial driver's license to drive a truck for commercial use and in order to get one, you might need to go to truck driving school. Also, often these schools provide job placement, helping you get a job.
As fast as the truck will go... 4 LOW is the limited one < 30mph.
No it will not. Sounds like the transmission has a major problem.
You are probably low on transmission fluids