my truck has been setting for two yrs give or take and when i when to roll down the back window it only moved a little and i need someone to help push it down but won't go up or down with out help... is there anyway of oil something up or does the motor need to be replace...

 

Probably the motor. You can try cleaning the connection where the motor mounts to ensure a good ground or just run your own. Also grease up the rails and arms in there

 

I would definitely check how good the ground is in the tailgate. The ground is accomplished through the hinges. I plan on running a separate ground to my power tailgate when I install it onto my '74.

These motors are known to get weak though, but typically it isn't too difficult to pull the window down.