There could be a number of reasons why your truck will not shift properly. There could be something wrong with your clutch or transmission.
you need a clutch that's all
Check for a blown fuse.
your fuel line has a leak when the truck is running cus that's when it is sucking fuel from the tank.check your lines when its running to find the leak.
if its a stick shift and ur shifting it wrong then mabye that's why
is this truck is a good truck i like to know if this truck is a good truck what is wrong with this truck
Because it's in park.
I also have a similar problem. I cut the wrong wire while installing speakers with the truck battery running. Sparks shot out and now my windows wont roll up and my cab light comes on when I push the brakes. I have checked the fuses and the relay. ??
The VSS (Vehicle Speed Sensor) is probably bad. Also check the fuses.
because youcould easily bump it in to a wrong gear while your driving and could lead to big diasters!!
You Probley have a blowed head gasket.
Because there's something wrong with it. For a more detailed answer, take it to a mechanic.