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Home >> Chevrolet >> 2005 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting >> Troubleshooting >> First Gear Only - D4

First Gear Only - D4

First Gear Only - D4

Checks Cause
Sun Gear Shaft (649) Broken shaft or broken splines
AT Output Speed Sensor Assembly (22) Reads zero
Check for DTCs.
AT Input Speed Sensor Assembly (22) Reads zero
Check for DTCs.
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