Here's the deal. I had an aftermarket transmission cooler, my transmission blew up so I took it to the shop (warrenty). They fixed the transmission and told me to put the transmission cooler BACK to stock. So I just finished doing that, I start up the truck, and push in the brake and try to shift into reverse and the shifter just goes up and down with no resistance and the truck stays in park. The shifter just moves up and down freely... I was wondering if I lost a prime in the transmission or something? I really dont know!

2007 Dodge Ram 2500 Mega Cab
5.9 lt Diesel
Automatic transmission.

 

did you get the shift linkage hocked up right?.. i did this a while back with my durango. I didnt have the linkage bolt tight enough

 

I was able to get it working two days ago actually. Right by the coolant output line was the shift cable, when I was installing the output line I hit this cable and knocked it loose off the tie rod piece. So basically the shifter was free floating. I popped this back on and away I went!