Stop towing with it. My other 85' 4x4, had a transmission failure at 230K and they towed with it a bunch. These transmissions aren't meant to tow.
Try redline MT-90, it's supposed to make theses transmissions shift less notchy.
IF towing miles are counted it probably has 230K on it. Shifts OK, except it's been acting like the synchros are not totally doing their job. (Probably something to do with having motor oil instead of transmission fluid inside)
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