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#1
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Chevy 1 ton auto tranny problem
Anyone have any experience with the 1 ton Chevy tranny dropping out of 4th
gear and back into 3rd while just cruising up the highway ? It does it with just a constant pedal and suddenly drops down and then almost immediately shifts back up. The TPS was replaced for this problem but it still remains. It's just intermittent too. Not a solid failure. The tranny fluid looks like a yellow instead of red as well. Not sure about that. Otherwise it has 140k on it and runs fine. Steve m.. |
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#2
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No experience specifically, but an educated guess....
I would suspect that a clutch piston seal is extremely brittle and is not fully sealing (not letting fluid pressure to fully apply) its respective clutch pack in 4th gear. 140,000 miles is certainly high enough for a problem like that to arise. If this is the case, I would recommend an overhaul before something worse happens due to the extra heat and friction from that slipping component. I don't know what kind of diagnostics your ECM is capable of as I believe anything over 8500 lbs GVW (1 ton Chevy?) is exempt from OBD-II rules. If your ECM can set slippage codes, that would be something to check for as added confirmation. Toyota MDT in MO |
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