I have a international loadstar 1800 dump truck and I don't know how to use the gears(4+2) I can shift gears 1-4 but how do I use the extra 2 gears?

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i have a international loadstar 1800 dump truck and i dont know how to use the gears(4+2) i can shift gears 1-4 but how do i use the extra 2 gears?
Is that truck equipped with pnuematic-split two-speed rear axle?
There is usually a control plunger/switch on the shifter.
I hope this helps.

i have a international loadstar 1800 dump truck and i dont know how to use the gears(4+2) i can shift gears 1-4 but how do i use the extra 2 gears?
Yes but how do you work it after its in 4th gear, I know you pull the switch and then what? Thanks for replying