I'm sorry guys, but no stock V6 Sport Trac will do over about 110 MPH even if the speed limiter was not set at the factory, which I doubt has happened since the 2001 Job1's.
So if you are seeing speedometer readings above that, you are seeing some very poor speedometer calibration, or you are smoking something, in which case you probably should not be driving...and not at that speed.
Ya, Ya, I know. Everyone swears they drove their ST up to 150 MPH up a 30% grade against the wind, during a blizzard with 2 feet of snow on the ground.
If you actually did see the speeds you claim, it was simply the ECU having a brain-fart.
When you hit about 96 MPH in an ST, it will feel like someone shut your ignition off It will remain off even when you slow down until you take your foot off the gas. Then the engine will act like you just took you foot off the gas. When you step on the gas again, it will start to build up speed again, until it hits 96 MPH and it will again just shut off the engine.
There is no bucking or or missing, it just shuts off and starts to slow down. If the engine is running I can't hear it and there appears to be no power coming from the engine until I lef off the gas then you hear and feel the engine running as the truck slows down...It's a very strange and unusual feeling to have the power cut so quickly and completely.
...Rich