1998 K2500 7.4L Automatic that won't shift into drive or reverse

[Shawn Delay]

Occasionally when it rains I will be unable to shift my truck into either drive or reverse after starting my truck. The truck will fail to go into any gear and the engine will just rev. I can turn my truck on and off and the same thing will happen. After a few hours the truck will go into any gear and work great. What do you believe is going on?

[riverbanks]

So shift lever won't move?,that's the interlock on the steering column or brake switch

[Doug_Scott]

I think he is saying the shifter moves, but it just does not actually shift.  I am saying that because he says the engine just revs when he shifts into any gear.

 

It has to be something that knows it is raining.  Not trying to be funny, I mean whatever it is, is being impacted by the water.  When you say if you wait a while it will work, do you mean if you just leave the truck where it is, and not running, it will drive some time later?  Does it have to stop raining?  What happens if you leave it idling for 30-45 minutes?