by D-Wat [OP] » Feb 26 2013, 2:23pm
by red16 » Feb 26 2013, 2:45pm
by D-Wat [OP] » Feb 26 2013, 3:17pm
by steved » Feb 26 2013, 3:42pm
by Z15 » Feb 26 2013, 3:59pm
#PIP4054D: Eaton Locking Differential Chatter Shudder Noise On Turns - (Jul 19, 2010)
Subject: Eaton Locking Differential Chatter Shudder Noise on Turns
Models: 2004-2007 Buick Rainier
2000-2011 Cadillac Escalade, ESV, EXT
2002-2011 Chevrolet Avalanche
2004-2011 Chevrolet Colorado
2003-2009 Chevrolet Express
2000-2011 Chevrolet Suburban, Tahoe
2000-2007 Chevrolet Silverado Classic
2007-2011 Chevrolet Silverado
2002-2009 Chevrolet Trailblazer
2004-2011 GMC Canyon
2002-2009 GMC Envoy
2000-2011 GMC Yukon, Yukon Denali, Yukon XL
2000-2007 GMC Sierra Classic
2007-2011 GMC Sierra
2003-2011 GMC Savana
Equipped With a Locking Rear Differential RPO G80
This PI was superseded to update model years. Please discard PIP4054C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Customers may comment on a chatter or shudder from the rear axle on vehicles equipped with an Eaton locking differential. This condition would be noticed in parking lot maneuvers, turning, or during locking differential engagement and may be more noticeable when the differential is hot. Locking differential clutch chatter may be causing this concern.
Notice: This does not apply to vehicles equipped with RPO QS4 (Quadrasteer) which is part of option package NYS. Quadrasteer vehicles use Dana axles and have a different fluid requirement.
Notice: This PI does not apply to vehicles equipped with a RPO G86 limited slip differential.
If differential clutch chatter is encountered in a vehicle equipped with an Eaton locking differential, flush, drain and refill the differential with new synthetic fluid, use the fluid part number listed in SI for the vehicle currently being worked on. If the condition returns, replace the rear differential clutch This PI was superseded to update model years. Please discard PIP4054C. plates and refill the differential with new synthetic fluid, use the fluid part number listed in SI for the vehicle currently being worked on. Refer to eSI for clutch plate replacement and set up procedures.
Notice: Eaton locking differentials used in 10.5 rear axles are equipped with steel clutch plates. It is a design characteristic of these steel clutch plates to exhibit more clutch chatter than other models.
Important: Installing any friction modifier causes the clutch pack in the locking differential to slip and miss engagement. A fluid flush can often remove debris that is a contributor to clutch chatter. Adding friction modifier additive can cause a loss of locking differential functionality.
Notice: On Quadrasteer equipped vehicles, simply flush the rear axle and refill with the fluid listed in SI document 793720 under the steerable application.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
by masterem88 » Feb 26 2013, 4:33pm
by masterem88 » Feb 26 2013, 4:36pm
by Z15 » Feb 26 2013, 4:47pm
AMSOIL Severe Gear is compatible with most limited-slip differentials. If limited-slip differential chatter occurs, add AMSOIL Slip-Lock friction modifier additive.
by steved » Feb 26 2013, 5:08pm
by steved » Feb 26 2013, 5:13pm
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