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[updated:LAST EDITED ON 22-Dec-02 AT 11:14 PM (EST)]I am sure there are a ton of disclaimers on this one and I apologize to Ken if I am out of line, BUT the Micro Chips Supertuner does work. Where I live now, I haven't had a chance to test the top speed of my F250 LD 4X4. But the other day I had my Garmin 195 GPS along and I had section of road that requested a run. I hit 108 mph before I backed off and I know she was good for a little more.
Max? 112-115 should be about it with my 3.31 gears. Given time, I'll find out.
As far as handling - she was rock steady and rolling strong when I backed off (couldn't tell if it was a cop car or what when it topped the hill, so I backed off. There are better places to check this out).