I don't know about that. All flushing does is replace the old with the new. I've heard about problems with leaks when changing fluid types. I flushed out my 175K transmission with synthetic and all is fine. That was 50K ago and I tow about 10% if the time (about 6K a year towing).
I put in a shift kit over 100K ago and all has always been fine with the transmission.
Art.
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1992 Camaro, 2x3 chassis, all fiberglass except quarters and roof. 8.864@154.1
1969 Camaro RS/SS 396/350HP, stock frame off restoration
1997 Camaro SS, stock.
1987 Buick Grand National, 11.85@115, 18,500 original miles
1987 Buick Grand National (old car, still drive/tune for the new owner), 9.20@150
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