Quote:
Originally Posted by JJAB
I do feel the tranny lock up. But, it slips in and out of lock up. Currently, the truck is being driven in town, so a lot of stopping and starting. It just really drives like I have a stall converter and it is just the original converter that came with the 4L80E.
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The fluid pump can make whining noises (wore out pump) or its injesting air from a bad pump to filter seal, cracked filter housing, low fluid level or restricted cooler flow.
The converter could be bad, BUT a bad converter can & will damage the transmission.
Take it to a transmission shop & have them do a line pressure test in reverse should be at least over 250psi, If not its rebuild time.....How many miles are on your trans? 4L80Es do fail. They are VERY stout transmissions, but they dont last forever.