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I've had my 02 5.4 at a hair over 100 mph. Click the over drive off and she'll stay in a lower gear for somemore rpms when it come's time to pass a slowpoke doing 75 mph.
When I program mine with my edge it shows the speed limiter at 94 mph. I set mine at 110. I have gotten my truck to 100mph with the edge custom tune but was afraid to go faster. It appeared to have alot left in it.