1997 moving on hills while in park
 

just bought truck last week 5.0 awd 156,000 milesit has that dredded front end squeak in it. dont know what other info you need. When i put in park the truck will roll, now i can not physicly push truck while in park but over 20 min it will roll one foot only thing i see diffrent is front drive shaft is missing is that why not sure why missing gas milage if it would even effect that maybe any idea's????????