Re: o/t 4L80E trans problem

Posted by Allan In NE on June 16, 2006 at 05:36:42 from (148.78.243.25):

In Reply to: Re: o/t 4L80E trans problem posted by muggsw6 on June 16, 2006 at 05:07:05:

Mark,

That erratic shift kinda sounds like the wiring loom.

Pull the connector off at the tranny end and see if there is transmission fluid in it. There was a service bulletin for that back in the 90s and the transmission end of the cable had to be replaced.

We found out later that it was the fluid causin' the trouble. If there is fluid in the connector, just clean it out with some brake clean and screw it back together.

If there is no fluid in that connector, look for a "ratio error" code, which tells you that the tranny is trying to go south on ya. However, that "multiple code" thing really points to a communication problem between the tranny and the ECM.

No, there is nothing wrong with the shift solenoids or the converter lock up; they don't magically cure themselves with a key cycle.

Your temps are right on the money. At 250 degrees, I pull 'er over for a cool-down. Is that clutch hub on the water pump okay? Are your electric fans working as they should (454 engine)?

I assume you have changed the tranny filter as well?

Also, a bad body/engine electrical ground will absolutely drive these things nuts. Make sure the little "star washers" are in place and good and tight.

Hope ya get 'er,

Allan

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