overdrive working intermittently 4l80 transmission

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08-07-2010, 07:24 PM

lmt0705

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overdrive working intermittently 4l80 transmission

I did a burnout in my car when i drove away i had no overdrive. I pulled over turn the car off started it back up right away and the overdrive works fine any ideas. It's a computer controled toddler transmission.

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08-08-2010, 02:32 PM

L-EATER

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Quote:

Originally Posted by lmt0705

Are you sure it is overdrive that is causing the problem, or could it be converter lockup?

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08-08-2010, 03:05 PM

lmt0705

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it could be converter lockup now that you mention it because it wasent locking in 3rd either and it usually does, but it made no difference in rpm if i shifted to 3rd or left it in forth

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08-08-2010, 04:21 PM

lmt0705

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I just added a second cooling fan and it has pulled my voltage down to 12.8-13.2 from around 14. is it possible the trans is not seeing enough voltage to activate the lockup solinoid?

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