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You shouldn't have to use 4wd to tow a boat out of the water. Does your truck have a 2wd button or just the 4high and 4low button? If you have a 2wd button, put tranny in neutral and then hit the 2wd button. If you just have the 4high and 4low button, put the tranny into neutral then press the 4high button twice (Once to get back into 4high, then again to get out of 4high and back to 2wd).
Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.
Good Evening. 4high is a simple deal to get working. 4low has a few more steps. First of course is starting the truck, shifting down into neutral at a stop then put it in 4low. After doing so then put it down in drive 4low should now be engaged. And to take it back out of 4low simply reverse the operation. Any other questions let me know, becuase if it can do 4high the shifting motor can do 4low.
check carefully to make sure it is shifting from 1st to 2nd.... there is a "sun reactor shell" inside the transmission that when broken causes reverse, 2nd and fourth to be lost. it is an extremely common failure.
best way to check.... drive along with the gear shift lever in "2" you should feel one shift as you accelerate. then carefully bump it into "3" or "D" whichever the case may be. another shift should be felt. if you do not feel a shift, you have likely stripped the teeth of that shell. hope this helps..
The vehicle must be in neutral to shift into and out of 4LOW, 4HIGH is not for typical road use, anytime you have "fair" road conditions, the wheels will vibrate in 4wd. Use the AUTO 4wd when on a road that has a solid surface, mostly free of ice, it will only kick in when a wheel slips.