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Porsche
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1989
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928 GT V8-4957cc 5.0L
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Repair and Diagnosis
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Transmission and Drivetrain
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Automatic Transmission/Transaxle
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Testing and Inspection
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No Upshifts
No Upshifts
1.
Incorrect
governor
pressure.
2.
Dirty centrifugal
governor
.
3.
Dirty valve body housing.