I have a bottle of DEXRON III ATF sitting on the shelf. I added a tiny bit on 3 different occasions and did a turkey-baster partial swap twice. There's still plenty left in there. Part of me wants to pull the reservoir, clean it out thoroughly, and rig up a power flush of sorts, dumping the return into an empty container and the feed drawing from a fresh, clean supply, but I haven't done that yet. If I ever get around to replacing the rack, I'd probably do that first.thanks for all the info. any idea how much new fluid is needed after flushing? wanted to try the Lucas stop leak, I remember it got pretty good reviews by Scotty Kilmer although it was a different product( Lucas ATF additive). $19 for 32 oz on Amazon. is that enough ?