Transmission not shifting properly

1992 TOYOTA PICKUP
320,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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TODD EMPFIELD
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Drive does not work to start off, but reverse, first, second work find. And when you get it up to speed drive works but the overdrive light comes on shift it back down.
Jan 9, 2019 at 9:07 AM
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STRAILER
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Hello,

It sounds like you have a partial plugged catalytic converter which will lower vacuum and cause the transmission is shift late. Here is a guide that will help confirm the issue:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please run down this guide and report back.

Jan 10, 2019 at 12:30 PM