Have a 2007 /1500 Work truck, the 4 wheel drive won't engage when it's below freezing, shift is on the floor, transfer case is going into 4 high and 4 low. It has to be put in a garage or temp in 50's to start working.

 

So are you saying that the truck is saying it is in 4 high or 4 low but is not really engaged.

 

It will not engage in 4 wheel drive when it is freezing out. stays in 2 wheel no light on. transfer case engages 4 H 4 L but not the front end til its warmed

 

Does the transfer case engage? IE when you shift it in 4h, and you look under the truck, does the front shaft spin? If so, you may have a problem w/ the engaging mechanism inside the pumpkin of the front axle.

 

Have to wait til it gets cold enough to check. Thanks