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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - 4L60-E >> Trouble Shooting >> Symptom Diagnosis >> No 4th Gear Hot

No 4th Gear Hot

Check engine speed (tachometer) sensor, pressure switch assembly, brake switch, system voltage or TCC solenoid.

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