Question about 1987 Toyota Pickup

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Overdrive disengages I have a 1987 Toyota pickup 22r carburated not fuel injected pickup two wheel drive with column shift automatic transmission. My problem is with the overdrive automatic transmission. While driving the truck I hear what sounds like a relay clicking and then the overdrive disengages. This occurs more frequently in warm weather. I can reengage the overdrive with the button which is located on the column shifter and it may or may not say engaged. What's going on?

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  • 154 Answers

Bad relay switch

Posted on Apr 23, 2010

  • all4link Jul 20, 2011

    What type of rely switch?

  • CJ LaFever Aug 30, 2011

    Where is this overdrive switch located?

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The 2wd - Auto - Lock switch can be switched at any time, as it operates an electromagnetic clutch - 2wd is rear wheels driving only - Auto - is to automatically engage 4wd when wheel slippage is detected (this also happens when turning at intersections, due to the inside wheels having a shorter path to the outside wheels, and can give a binding effect on sealed roads (I don't drive with it in auto on sealed roads) auto is excellent if you get, or expect wheel spin from an intersection when wet, just flick it on before or when you have wheel spin, also on gravel roads, having it on auto will greatly reduce the sliding of the back end, and make the car noticeably more stable.
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Also the O/D (overdrive) button on the side of the Tee shift lever, is to engage / disengage overdrive (5th gear) - never do heavy towing in overdrive, this will cook the transmission and overheat the engine (due to the radiator being used as a heat exchanger for the transmission fluid.
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When cold, it is normal for the transmission to stay in 3rd (2-3 minutes of driving), until it has warmed up, and then stay in 4th for a few more km's (5-6 minutes), before it has warmed up enough to change into 5th (overdrive).

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