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Hi, i do know what that device is as ive driven school bus for 5 years, and my school bus has this i have a 1984 IHC BB 71 pass. what the switch is for is shifting your rear axle from high to low range as you probably have a 4 speed transmission with a 2 speed rear axle. the electric motor in the axle does the shifting when you pull it up or push it down but if the motor isnt hooked up right the axle wont shift. most of the time the button should be up which would be high range to shift it from low to high you have to shift into fourth gear and depress the clutch then pull the knob up and let off the clutch. on my bus i dont have to clutch it i just let off the accelerator in 5th gear pull the button up and then accelerate. you may need to double clutch. but the 2 speed in the older models is used in low range mostly in town and high for highway use.
hope this is helpful. also the 2speed has a tendency to freeze up in the winter and 9 times out of 10 it will freeze up between hi and low range if you mess with it in the winter.
happy busing
Aaron
1985 IHC thomas 77 pass
1984 IHC Blue Bird 71 pass
1980 Ford B-700 Ward 71 pass
1975 IHC thomas 65 pass |
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