Wipers took a Dump

OK, So one linkage goes from wiper motor pitman arm all the way to drivers side wiper pivot. The other linkage goes from that pivot back across to the passengers side pivot. Thus all the work load is on the first linkage and drivers side pivot. To service, I remove the inst' panel. A rallye inst' panel includes the heater radio center section. A standard panel such as yours does not. In that case I also remove radio, or both radio and climate controller so to work through those openings.
In the case of my 73 Valiant, fully optioned factory air. First the lower under dash vent box, then the ash tray and its hanger, then the radio.
Just for edumacation... the OEM nylon bushings lasted many years. When aftermarket replacements last only 1 to 3 years, the quality of those bushings is pointed out in every case. The truth is, wear and binding in the drivers side pivot assembly is the culprit. Remember I explained all the work load being there. Bottom line, if you don't want to do any of this again any time soon, do this... Mark the pot metal pivot assemblies before you drop them. Take them to the work bench and do the pivot seal grease fitting service while you are in there. Reinstall the pivots rotated 180 degrees from where they were marked. This puts the pressure and subsequent wear on the opposite side of bushings where little to no wear is. Simple way to buy x number of years in trouble free operation.
I never cared for Chryslers in cabin wiper mechanics mostly because they are noisy. I found that they weren't so noisy when new. I totally rebuilt both wiper pivots in my 67. Learned about them by doing so. Those wipers now run smooth and quiet even on a dry glass. Rotating the pivots in my 73 worked almost as well.