[Thunderguts]

Funny, I actually just ordered some Redline ATF-D4. I'll probably throw that in there over the weekend and see how it goes. The Motylgear has friction modifiers to help worn synchros engage like the GM Synchromesh, but maybe both are too thick. The ATF-D4 may produce better results.

What gives me hope is that the right fluid can absolutely make a huge difference in shifting. When I got my Honda back from the dealer, they replaced the smooth-shifting GM Synchromesh with Honda MTF. The car was virtually un-shiftable. It was a shocking difference. Once I replaced the Honda MTF again, everything was perfect.

Fortunately gearbox oil is something that's both relatively easy and inexpensive to swap out.