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just a thought, LTD/Marquis c-6s didn't always have shift detents in the valve body. the shift valving in the valvebody will just slide smoothly. earlier c-6s and truck c-6s usually had detents on this shaft to make the bumps you feel when you move the selector.
you may need to swap valvebodies, and add the rolling spring thingie from the old trans. you will see the difference when you have the trans pan off.
you may not have this problem at all though.
manually move the shift arm on the trannies, you should feel the clunk between gears, if you do, you are alright.
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