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Chevrolet
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2005
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Silverado 1500 HD, 4WD
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Repair and Diagnosis
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Transmission
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Automatic Trans
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Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting
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Troubleshooting
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Harsh Shift 4 to 3
Harsh Shift 4 to 3
Harsh Shift 4 to 3
Checks
Cause
Retainer Ring (533)
Not seated
Spring Assembly (532)
Not acting
Bolt (26)
The oil feed hole is plugged.
Cup Plug (530)
Plugged
Direct Lube Exhaust
Blocked