Drivetrain - Transfer Case Grinding Noise in 4WD
TSB SB08-05-S001Issue Date: February 2008
NVG 226 Transfer Case Grating/Grinding Noise When 4WD Is Engaged, Service 4WD Lamp On, DTC C0327 Set
Affected Vehicles
2003-2008 Isuzu Ascender with 4WD
Service Information
Condition:
Some customers may comment on a grinding type noise in the transfer case when 4WD is engaged in either AUTO or 4WD mode. This noise may also be accompanied by the SERVICE 4WD lamp being illuminated and DTC C0327 set.
This condition is more prevalent on vehicles where 4WD is continuously used.
Possible Cause:
This noise may be caused by a faulty clutch pressure plate bearing.
Correction:
Replace clutch pressure plate bearing assembly and clutch lever.
Service Procedure
A more robust clutch pressure plate bearing, inner plate and clutch lever has been released for service. Replace the clutch pressure plate bearing, inner plate and clutch lever. Refer to the Transfer Case Disassemble and Transfer Case Assemble procedures in the Service Manual. Former and new parts should not be intermixed during transfer case overhaul and they are to be used in sets only.
DO NOT replace the transfer case assembly unless extensive internal damage has occurred.
Parts Information
Always refer to AIPDN publications for the most current parts information.
Warranty Claim Information
Always refer to the Isuzu Service Policy Procedure Manual for specific details on warranty coverage and policies. Reference published Labor Time Guide for claim processing, if applicable.
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