Skipping gears from 8th 35MPH to 6th gear

Just drive the truck!

 

Could you do it. Yes. But why? Theres no reason to do that. I mean you could brake from 8th gear all the way to 5mph and rev match into first if you wanted to... But why? Just downshift.

 

Try it an see what your RPMs are like. Are the RPMs still in the normal range for going down the road?

 

If your RPMs are really low in 8th gear at 35 mph then you might could skip a gear when downshifting, but make sure you don't have to exceed the engine's governed speed in order to do so.

 

Why wouldn't you just go into 7'th?

 

When you are new it's probably better to drop/advance a gear out of a time until you mentally know the road speed, gear, RPM like you know your phone number. Frankly, I rarely knew the number of the gear I was using at every moment.