Hi all. I have a transmission problem that I need help with. I have a three quarter ton Chevrolet pickup with the 4L80E transmission. Lately the transmission has been slipping during the first-second upshift and often has really hard upshifts for no apparent reason. I have been trying to determine the cause for this problem. The transmission has received regular fluid changes and maintenance over its life and was completely rebuilt about 60,000 kilometers ago. If anyone might have an answer to my problem please respond. Thanks in advance.
A trip to the dealer may help - the 4L80E tranny has alot of troubleshooting and diagnostic items built into it, which are accessible with the dealership scanning tools.
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