1989 Toyota Tacoma Overdrive Hunting

1989 TOYOTA TACOMA
180,000 MILES • 6 CYL • 2WD • AUTOMATIC
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FASTCEPTOR
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When driving the tranny will shift up into overdrive and back out whenever for no apparent reason, this is with the overdrive button on. It does not have these issues when the button is off. How do I get it to stay in overdrive. Sometimes it shifts back down when going down hill.
Apr 1, 2010 at 1:22 PM
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DOCFIXIT
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Possible causes TCC solenoid, shaft seals and torque convertor. Pressure test would tell
Apr 1, 2010 at 2:47 PM