Hey i have a 1991 gmc sierra 4x4 having issues with the 4x4 lately we changed the shaft from the transfer case to the front chunk n when we locked it in 4wd had hard time unlocking it to 2 wd i asse this is the acuator in front but when it is in 4wd the truck seems to dog track or has a funny move when going on the road any ideas
