I have a 2001 chevy silverado 4x4 dually with auto trans with tow range select button on gear shifter. I tried to engage it while going down a hill with a load on flat bed. It did not ingage. When I came to a stop and tried to start moving again the truck would not move. It only moves in reverse, when I put it in 1,2,3,D it does not work. It is as if the truck is in nuetral.
Chk tje vacuum hose on the modulator at the back of the trans. it should have vacuum. TTit has a rod that controls certain movements in the valve body. especialy downshifting. If there is no vacuum or the rod is sticking. We might have it . If there is any fluid in the mod vac hose, the modulatorhas a leaking diaphram. Good Luck,_ Ned_
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