Pull the shifter into low gear (1st gear). Get under car and loosen nut attaching cable to linkage. Make sure (by checking with your hand) that the linkage is clicked into low gear. Now tighten the nut back up, all the while taking up any slack in the cable. Also, make sure the brace that attaches to the pan bolts that keeps the cable housing stationary is affixed properly and not loose. Get back in the car and place it in park and start the car and test it to see if it engages all gears properly. If not, time to replace the cable.
