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Rig up a vacuum gauge so you can read it while driving and see how much vacuum you have at the downshift point. Deceleration increases manifold vacuum and may affect the downshift. Braking hard uses vacuum and could smooth the downshift.

Some modulators are adjustable, there is a litle screw in the tube hole for the vacuum line. If yours has one you can change the setting and see what happens.

Welcome to the site, glad you stopped by. :waving:
 
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