I have six quarts of type F. Have read of what the pro mechanics have mentioned and think that dropping in a pan full of type F non synthetic is the way to go.

My transmission shifts so you can feel it when cool but once warm they are decidedly smooth. I have 200k miles on the transmission and have no desire to rebuild it just yet. My fords a 99 and 05 both shift faster and with more force.

When I changed the fluid and filter (with valvoline mineral based dextron5) 2000 miles ago there was no particles or discoloration in the fluid. I can't there was any noticeable change in shifting then. I am going to add the 4 or 5 quarts into the transmission at the next change.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.