My Ranger drives well in 4 wheel drive, but, I cannot park without disengaging the 4 wheel drive. This has always been a problem but got worst when I changed the shift motor.
Why does my Ranger not manuever in 4 wheel drive? on 1993 Ford Ranger
Sounds like you are parking on dry pavement. Most 4w drives have to be on something that allows wheels to slip a little bit when making sharp turns. You should not drive it in 4wd on dry pavements.