My newly acquired '81 300SD has a difficult time shifting into P sometimes. I have to go back and forth b/w P and D for it to catch. My buddy says it might be either the shift linkage or some bushing... What do you think???

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