Hold on!! Check the vacuum line that connects to the vacuum modulator on the side of the transmission before going too far. Look for the black vacuum line. If that line is loose or leaking it will cause hard shifts all around.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon