My new ride has a difficult time catching into Park. When I park the car I shift the transmission into park the tranny will kinda click and the car will roll downhill a bit. I have to go back and forth from D to P to get it to catch into Park. Any advice here??

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http://www.libertyagrifuels.com
1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike