When I put my auto transmission in 3rd gear it often jumps into 4th gear?

1991 TOYOTA LANDCRUISER
115,000 MILES • V8 • 4WD • AUTOMATIC
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When I put my auto transmission in 3rd gear to increase my passing ability on smaller roads and save wear on the engine, it often jumps into 4th gear anyway, even though my speeds and Rpms are low enough to not warrant this change. How can I repair this problem, and what causes it?
Oct 14, 2010 at 11:36 PM
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The transmission in your car is controlled by a computer. If you scan the computer, it will give you the fault codes of the malfunctioning component.
Oct 14, 2010 at 11:38 PM