A co-worker had his 2001 Dodge Ram 1500 4x4 power flushed one time. And he didn't get 10 miles down the road when the engine compartment caught on fire! And upon investigation, the filter plugged up causing the tranny fluid to start shooting out the dipstick tube all over the engine compartment. He took the shop owner to court to get things taken care of, since the owner said it wasn't their fault. During the court session, the judge went and did some online search and found a Dodge online bulletin, that clearly states, "Do not power flush, tranny failure very possible, with reports of fire!"
Well, he got a new truck out of the deal!