The 4Runner has
VSC = Vehicle Stability Control (corrects wild understeer or oversteer)
TRAC = Traction control (brakes and throttle)
ATRAC = Automatic Traction Control (brakes only, in 4WD, more agressive in 4Wlo))
and a Torsen Locking Center Differential (manually engaged turns off VSC)
On current model 4Runners the only (poor) way to disable VSC is to unplug a connector at the reservoir for the brake fluid. This also disables ABS!
This is in an FJ Cruiser but it is the same as the 4Runner
2008 4Runners will have a button to manually disengage VSC but no word on retrofitting to ours.
See this
http://www3.telus.net/public/bernse/brakecon.pdf