[RedChevy]

I drained my A/T cold and replaced the exact amount that came out (4 quarts, 12 oz.) with Castrol Dexron VI and Lubegard Red at 24K. I now have 26K and have felt no negatives (or positives) since doing it. I'm happy to have replaced approx. half the OE fluid with fresh stuff. I plan on doing this every 25K which should insure a constant supply of fresh additives...I think this is a better plan than flushing....

 

[RedChevy]

Here's an update on my A/T D&R after several months and 6K miles....it's shifting better than ever.

I must have gotten the fluid level right and I believe the Lubegard Red has also helped as I haven't had a jerky shift in quite a while.
I'm very happy with my A/T fluid partial change.