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I have noticed that my trans will shift very hard sometimes. It does it only when I am accelerating hard. Just now when it went to Overdrive it was loud and hard shifting up. Did it before in lower gear, so hard I thought I hit something.
Truck is a dually and is stock except for exhaust. No chips
Not that it couldn't be a problem, but I haven't seen any trouble with that piston on any of the valve bodies I've dealt with. The only other thing I like to change is the accumulator regulator valves. They have been know to stick and cause shift problems. TransGo E4OD/4R100: E4-VL-LR3 I see they new include a stock .372 line pressure modulator valve in this kit.