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transfer case switching from 2wd to awd
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geojo
User
Dec 15, 2012, 7:47 AM
Post #1 of 6
(3202 views)
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transfer case switching from 2wd to awd
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2003 GMC Envoy XL 4.2 L inline 6 Miles 114000
When I switch between AWD and 2WD it sounds like it only is half way switched. IT makes a grindinding noise and acts like the vehicle is in neutral. What controls the switching between 2WD, AWD, 4WD
george warzynski
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 15, 2012, 8:52 AM
Post #2 of 6
(3168 views)
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Re: transfer case switching from 2wd to awd
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TECHNICAL
Bulletin No.: 08-04-21-001B
Date: August 25, 2008
Subject:
NVG 126/226 Transfer Case Grating/Grinding Noise When 4WD is Engaged, Service 4WD Lamp On, DTC C0327 Set (Replace Clutch Pressure Plate Bearing Assembly and Clutch Lever)
Models:
2004-2007 Buick Rainier
2002-2008 Chevrolet TrailBlazer Models
2002-2008 GMC Envoy Models
2002-2004 Oldsmobile Bravada
2005-2008 Saab 9-7X
with Four-Wheel Drive or All-Wheel Drive and Active All-Wheel Drive (RPO NP4) or Active Two-Speed (NP8) Transfer Case
Built Prior to September 18, 2007 (NVG 126) or September 21, 2007 (NVG 226)
Supercede:
This bulletin is being revised to update the correction information to include a procedure to reindex the transfer case encoder motor (actuator). This procedure is being provided to help reduce unnecessary warranty expenses. Please discard Corporate Bulletin Number 08-04-21-001A (Section 04 - Transmission/Transaxle).
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.
Cause
This noise may be caused by a faulty clutch pressure plate bearing.
Correction
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 SI. 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.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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geojo
User
Dec 17, 2012, 7:28 AM
Post #3 of 6
(3121 views)
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Re: transfer case switching from 2wd to awd
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presure plate bearing ,innerplate, clutch lever are these dealer parts or can they be purchased after market?
Should the first step be to have the actuator motor be reindexed?
george warzynski
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MarineGrunt
Enthusiast
Dec 17, 2012, 10:06 PM
Post #4 of 6
(3104 views)
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Re: transfer case switching from 2wd to awd
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You should be able to find them without going through the dealership although you'll probably have to order online. Your regular auto parts stores won't carry them. If any possibly did your best shot would be Napa but they wouldn't have it in stock. I highly doubt they do though. My stepdad had to buy quite a few different parts for a transfer case on an 03 Sierra 1 ton and he ordered through a place located in Florida. I don't think I can post the name here but you can find parts if you google them.
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nickwarner
Veteran
/ Moderator
Dec 18, 2012, 4:34 AM
Post #6 of 6
(3094 views)
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Re: transfer case switching from 2wd to awd
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I'd be putting dealership parts in this and following their instructions to the letter if you want this to hold together for any length of time. I'm sure it'll be a few years until the aftermarket gets ahold of the updated parts.
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