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Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
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Old 08-20-2005, 12:29 PM
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Question 4l80e nightmare
Has reverse only will go forward but you have to crank up the rpms to 5000 any ideas
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Old 08-20-2005, 02:21 PM
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Burnt clutches, or maybe cut seal bleeding pressure. I had a bad seal after a rebuild and had to rev the hell out of it to get it to move. It is all just guessing until you pull it apart though.
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Old 08-20-2005, 03:35 PM
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broken sprag...does it whine?
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Old 08-20-2005, 04:03 PM
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Worn boost valve causeing high pressure and blew out the forward piston seals.
Or the forward clutch cushion spring broke and is jammed up in the drum.
Do a pressure test it will tell you if it's hydrualic or mechanical.
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