Group: Super Mod
Posts: 649
Joined: 25-March 07
Member No.:
4,405
Drives: 1999 Taco PreRunner Xtra Cab 3.4L V6
Location: Sunny SoCal
The button changes the transmission shift points. It holds the tranny in gear just a tad longer than normal before upshifting for extra added "umph". When they should be used is up to you. I for one rarely use it on my Tacoma (or Hilux as it's known Down Under).