Changed trans oil an replaced with 60% gear oil and 40% synthetic transmission fluid. Completely gone are the grinding shifts, especially in the morning when it's cool. I'm amazed at the smoothness the transmission now.
The car is so much more fun to drive not letting the Rpms drop to idle just to shift.

 

Thanks for sharing. Transmission oil changes are often overlooked.

 

Corker.
Whats the ambient temperature where you live and drive?

 

I'm in Charlotte where it ranges in winter 20s to 50s and summer 80s to 90. Shifts smoothly regardless of temperature. Most impressed on really cold days, zero stiffness in shifts.