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GMC
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1993
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Forward Control 7.4 N
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Repair and Diagnosis (Single Page)
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Transmission
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Automatic Trans
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Automatic Transmission - Overhaul & Testing - 4L80E
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Trouble Shooting
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Symptom Diagnosis
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No 1-2 Shift in "D4" (1st Gear Only)
No 1-2 Shift in "D4" (1st Gear Only)
Output or input speed sensor reads zero. Sun gear splines damaged or missing.