bump the modulator pressure and drive it, if the slip is consistent in all shifts, sounds like low apply pressure.
the modulator is on the l/h side of the box in front of the manual valve arm. (shifter) pop the little rubber cap off and turn the enclosed key clockwise 3 turns, put the cap on and drive it..... too firm, back it off in 1/2 turn increments.
if the shifts are late or early, adjust the bowden cable (under the air filter behind the a/f sensor) longer housing, later shifts, shorter housing, earlier shifts.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.