[C10 - C90 Bill]

Just to add a little extra, when downshifting the Rear from 4 Hi to 4 Lo, hit the button down first, then dump the clutch in and out quick with your foot still on the gas as mentioned. When downshifting from 4 Lo to 3 Hi, pull the button up first, then complete your downshift as normal. The rear will shift itself during the stick shift. Always using the clutch will make things go smoother.