High to low /low to high ratio, you will need to be stopped and the transmission in neutral for this to be changed.
The 2wd - Auto - Lock switch can be switched at any time, as it operates an electromagnetic clutch - 2wd is rear wheels driving only - Auto - is to automatically engage 4wd when wheel slippage is detected (this also happens when turning at intersections, due to the inside wheels having a shorter path to the outside wheels, and can give a binding effect on sealed roads (I don't drive with it in auto on sealed roads) auto is excellent if you get, or expect wheel spin from an intersection when wet, just flick it on before or when you have wheel spin, also on gravel roads, having it on auto will greatly reduce the sliding of the back end, and make the car noticeably more stable.
Lock - this locks the differential, which further reduces wheel spin, when in mud / snow, but this will also make the car not want to turn corners, due to it resisting the different distances traveled by the inside and outside wheels.
A/T switch - this actually has 3 positions, and changes the shifting points of the automatic transmission - the middle is normal - Hold is to hold the gear longer, to improve fuel economy, and not change down (kick down) as quickly - Power has the opposite effect, it makes the transmission change down sooner under acceleration.
Also the O/D (overdrive) button on the side of the Tee shift lever, is to engage / disengage overdrive (5th gear) - never do heavy towing in overdrive, this will cook the transmission and overheat the engine (due to the radiator being used as a heat exchanger for the transmission fluid.
Another little quirk - if the transmission light starts flashing every 40 to 50 km, this can indicate that the wheels are different diameters (a flat tyre, or tyres have been swapped around and the spare is more or less worn than the other tyres), the computer will pickup that the wheels are turning at different speeds.
When cold, it is normal for the transmission to stay in 3rd (2-3 minutes of driving), until it has warmed up, and then stay in 4th for a few more km's (5-6 minutes), before it has warmed up enough to change into 5th (overdrive).
Testimonial: "very detailed and useful response - beyond the initial question. Thanks"
An other switch you may want to know about, Heater, this raises the idle speed of the engine, until it has warmed up, then it will automatically revert back to its normal idle speed.
Also be aware, that if the temperature gauge does not get to about half way (barely off cold), then the glow plug rail will stay on - the altinater will not be able to keep up with charging and will result in occasional flat battery - the temperature gauge is the clue - the thermostat is stuck open and needs to be replaced - its not an electrical fault - the glow rail controller picks up on the engine temperature.
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2 wheel for normal driving
auto for slippery conditions if truck senses slipping wheel it will automatically engage prevent slip
low is for real mud pluggin heavy muck heavy snow off road not sure what your power and hold is
Testimonial: "spot on feedback, thanks."
low machine has to be stopped t o go into it on the 2 wheel to auto can be done on the move two wheel to high also on th e move
important the low only when stopped otherwise do damage to transmission
not sure what the at button is when i find out ley ya know happy motoring look at rear of sun visor instructions for change normally on that
you can change on the move in auto and high
important low ratio have to be stopped to go into low other wise yo will damage transmission
low must be stopped
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not sure about at toggle will find out let ya know
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That was great thanks ricochet, what about the other part of the question: How and when can you change High to Low ratio? What does the toggleA/T button, which has 2 seetings - power and hold, do?
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