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Re: GM 4L80E Transmission Lockout Problem by Fred T. Hart Jr.
Had codes checked on transmission.
Problem is a busted piston in torque converter.
Hard to believe this transmission would go out for that at 80K. I would have thought that the 4L80E was a stronger transmission. As this one has been service properly and never used to pull over 6000# and did that rarely.
Just my luck to buy a truck with weak transmission.
Guess I will look at the Dodge diesel with manual transmission next time.
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