Porsche 928 Workshop Manual page 110

38
Automatic Transmission/Gears, Valve Body
928
-
Condition:
1st and reverse gears too loud.
-
Cause/Correction:
1. Replace front gear set depending on findings.
Note:
First and reverse gears are louder than the other
gears because of the ratio. A different car should
be used for comparison.
Condition:
3rd gear too loud.
Cause/Correction:
1. Replace rear planet gear set.
Condition:
Whining noise only when changing gears with full load.
Cause/Correction:
1. Replace oil filter.
Condition:
Whining noise, which increases in loudness as engine speed rises,
Cause/Correction:
1. Check primary pump, replacing if necessary.
a
38-120 Troubleshooting
Printed in Germany