Question about 2003 GMC Envoy Xl

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I can hear a metal on metal sound when i engage the 4 wheel dr ,also the front axels bind up at slow speeds when in all wheel drive ,breaks are good and also new wheel beerings what could be the problem

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Hello Dean.
Where on the vehicle is this noise coming from? I know it may not be easy to do as noises travel easily through the vehicles body, but I will need any help you can offer to help you.
The metal noise could be u joints, cv joints, differential bearings, transfer case.
There is a bulletin on the transfer case. here it is.

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.

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.
Important: When the clutch pressure plate bearing fails, it causes the clutch lever to over-travel, allowing the transfer case encoder motor (actuator) to rotate to an invalid position. Engineering has developed a tool and procedure to reindex the transfer case encoder motor (actuator) so it can be reused.



There is more to the bulletin but this gives you an idea of a possibility of the noise.

Also when in 4WD and when the road surface is hard with good traction it is normal to feel the binding. Especially when you are turning. The reason for this is all the wheels do not necessarily turn at the same speed or distance and the drivetrain will "wind up" crating pressure in the driveline.
The use of 4 wheel drive should be used only on surfaces where the tires can 'slip" allowing the binding to release.

There you are, I hope it helps you towards a repair.
Thank you for using FixYa.
KL

Posted on Jan 02, 2011

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Hi and welcome to FixYa!

As a first course of action please have the transmission fluid pan be removed. Before doing this please drain the transmission fluid then check if there are metal sheers on the pan. If there are then something is wrong with the transmission that's why it grinds.

You may need a transmission rebuild on this or a transmission from the junkyard is considerable.

If there are no metal sheers then try replacing the fluid. If the fluid is burnt it tends to make a grinding noise.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Jan 02, 2011

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