Come on guys, fluid is not going to fix broken parts.
It's grinding because something is wrong, period. Try adjusting the shifter and outlined in the Chrysler service manual. Still grinding, time to pull it and fix it.
Remember that the longer you drive the car like this the more damage you do, period. Syncro assembly, gear, fork are all being damaged. Right now some are still available but between the syncro and the gear your going to spend $425.00 on top of the rebuild cost.
Waiting might be your only choice but please don't believe that a fluid will stop, fix or do anything to help the problem but maybe mask it either way you need to open them up and fix them because transmissions are getting harder to find every day and the longer you wait the worse the problem will get.
Cliff Ramsdell
'86 GLHS 065 Going back to stock "appearing"
'29 Model A, 239 flathead V-8, 3 speed
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"Life's Journey is not to arrive at the grave safely in a well
preserved body, but rather to skid in sideways, totally worn out,
shouting...Holy Shit!! What a Ride!!"