There's a cable that runs from the shifter in the cabin to the lever on the tranny. It has a large adjuster along it somewhere for you to adjust the cable. Disconnect the cable from the tranny and push its lever all the way to the firewall (park). Then push the shifter in the cab all the way to park. If the cable no longer lines up with the lever, it should be adjusted.
This may no be the official method, and I'm too tired to look it up, but the backwater method should work just fine.![]()