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GMC
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2003
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Safari Van Cargo, AWD
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Repair and Diagnosis
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Transmission
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Automatic Trans
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Automatic Transmission - 4L60-E/4L65-E (Service & Replacement)
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Diagnostic Information and Procedures
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Electrical Function Check
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Manual Gear Range Selection
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Manual Third
Manual Third
With the vehicle stopped, move the gear selector to THIRD.
Accelerate the vehicle to 64 km/h (40 mph).
Verify the following:
The 1-2 shift occurs
The 2-3 shift occurs
There is no noticeable slip, noise or vibration