You should see about 100 to 200 RPM increase with the torque>converter unlocked.Since 4th gear is an overdrive gear, the transmission output shaft isturning more slowly than the engine so it takes a lot more torque toaccelerate. Having the>brake>lights come on will trick the transmission ECU into unlocking the torque>converter. overdrive), TC lockup in 4th.>If you want to unlock the torque converter while at a steady cruise, tap>the>brake pedal just enough to make the brake lights come on. The sequence is 1 to 2 2 to 3 TC lockup in3rd TC unlock and shift to 4th (A.K.A. Heres the way I look at it, in the auto you actually have 5 speeds, the torque convertor is either locked up or in partial lockup condition, as well as the 3 "mechanical" gear ratio's in the tranny.I found this from a post in alt.toyota."Overdrive is just 4th gear. The six-speed transmission in the Ford Five Hundred has two overdrive gears, with a final ratio of 0.686:1. Overdrive gears are appropriate when very little torque is needed – the vehicle is no longer accelerating – and can deliver the best fuel economy. ![]() If your the kind of person that doesn't put their foot on the gas all the time, use it when you need that extra oomph going up a hill ect.Overdrive" is the term for gear ratios that are lower than 1:1 – a situation where the engine is turning slower than the drive shaft. ![]() I will cruise on the interstate at around 60 hit the O/D button for an instant and have plenty of power to pass someone.no, it will not hurt the transmission to leave it off, you just won't have Overdrive and you will notice that there should be another shift point at around 45 to 50 MPH. My thumb is on the o/d button whenever I want more power, drive along at any speed and hit the o/dbutton (turn off overdrive, the litte light on the dash will come on) and you will notice the RPM's increase and you will have more power to pass ect.
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