Hill starting, up shift and downshift on hills.

Old post but for anyone new reading it really depends on the grade, your weight, gear ratio and engine torque rating, what works for someone who has a new Detroit or paccar that makes full torque down low won't work for someone like me with an old 6nz cat pulling over 100k pound b trains. Everyone will say you gotta start off in low gear but for me that doesn't work with a 13 speed and 4.10 gears, it may work for someone with 2.37 or 2.68 gears since their low is the same as my 1st gear. But for me I have to start out in 1st gear on the 13 speed because even with the engine fan on in low range i only get up to 3mph and the truck rolls back before It'll go into 1st. So I start in 1st gear turn the engine fan on, I shift to 2nd at 1200rpm but when you shift you wanna shift as your accelerating to keep the forward momentum don't accelerate then wait for the speed to level out before shifting otherwise you'll lose your momentum and takes twice as long to make the next shift, I shift to 3rd at 1300 and 4th at 1400 when I go from 4th to 5th there is a 600rpm gap on flat ground so I bring it up to 1800 to 2000rpm when shifting to high range then I do my split shifts at 1600. Works for me with loaded b trains but what works for me might not work for you.