Reb. B said:under fuse 13 (ABS feed) in the 06 fuse panel. Need to lift fuse box up and see the wires under panel. Under the #13 fuse is a green wire. I cut it in half and spliced a switch. Dad got beat by a gas rig yesterday and gave me hell that his 97 12V would do 118 and his 06 would only go 108 and the gas rig passed him doing 110. So i cut the ABS feed when i got near 108 and the speedometer fell to zero and the truck fueled all the way to 3450. Flipped the switch back on and no problems. Dad's happy now.
It's a DG/RD wire. If you cut the only solid green wire under there, the dash will say serv 4wd.
Dark Green with a red Stripe. Works like a charm.
Merrick