Question about 2004 Chevrolet Silverado 3500

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Auto trans will not ingage

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.

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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_

Posted on Oct 15, 2009

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