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overdrive? 200

posted by  tjl on  Tue Feb 3 06:23 CST 2004
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last visit: Thu Jun 6 00:22 CST 2013
[RELATED]

With a manual transmission, you drive your 4-speed + OD transmission like a 5-speed, except that instead of moving the shifter between the 4th and 5th gear positions, you press the button. A green light in the dash will tell you that you are in "5th" (4th with overdrive on).

With an automatic transmission, the overdrive is treated as a 4th gear on top of the other 3 speeds. Pressing the button changes from normal ("4th" (3rd with overdrive) can be used) and overdrive locked out (which will only allow shifting up the 3rd with no overdrive). If the overdrive is locked out, a yellow light in the dash will light up. You can test it by accelerating to freeway speed and feeling how many upshifts the transmission makes.

But would a 1992 car have a transmission with a separate overdrive unit, as opposed to a true 5-speed manual or 4-speed automatic? In a true 4-speed automatic, an overdrive button would simply allow or disallow the transmission to use the 4th gear.






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