Can someone decode my VIN for the differential RPO?
1GTEC19T64Z332428
1GTEC19T64Z332428
That's hard to reach from Afghanistan.lzn197 said:The option code listing should be a sticker on your glove box.
Are you saying that my VIN says I have the Eaton G80 rear diff? What throws me off is that every RPO reference to G80 is a gov lock, locking rear diff. This says limited slip. Limited slip and lockers are completely different. Thank you very much for the help.99chevyz71 said:GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6)
G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)
I've looked at the Eaton site and vendors who sell Eaton diffs. Nowhere does Eaton or the vendors call the Eaton mechanical locker a G80. I think the Eaton mechanical locker has picked up the G80 badge because og the GM RPO assignment. I don't know if the Eaton mech lockers were offered in 2004. So G80 in that year may heve meant the lim/slip diff.jreagan said:I'm almost certain that the G80 is indeed an Eaton locker. I had the rear diff fluid changed and there was no friction modifier added. I've always assumed that GM's RPO description was just off. There are real limited slips diffs in GM passenger cars, etc. (ie, clutch plates, etc.) but I've always believed the G80 is an Eaton locker (and seems to be just that on my Silverado).
From a truck service bulletinModels: 2003-2010 Cadillac CTS, Sport Wagon (Including V-Series and Export)
2004-2009 Cadillac SRX (Including Export)
2005-2010 Cadillac STS (Including V-Series and Export)
Equipped with Limited Slip Differential (RPO G80)
The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life.
Got it Mike,Z15 said:Once and for all, G80 in a truck is a mechanical locking differential made by Eaton and exclusive to GM trucks. Limited slip differentials are normally installed in rear wheel drive cars like the Cadillac CTS-V, Camaro and Corvette.
No, for the Sierra, the G80 means the Eaton locker. No friction additive needed.WingNut said:So back to the earlier post by 99ChevyZ71:
GU6 AXLE,3.42 RATIO
G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)
This is what he posted after I requested the RPOs off my VIN.
So my truck is a 2004 Sierra 1500 2x4 with the Z85 tow package. Assuming 99Chevy's post to be accurate, that locking G80s in 2004 were not standard on my truck, and that in your last post the G80 RPO offers several types of diffs; I do in fact have the limited slip.
#PIP4054C: Eaton Locking Differential Chatter Shudder Noise on Turns - keywords bind grab grind - (Aug 26, 2008)
Subject: Eaton Locking Differential Chatter Shudder Noise on Turns
Models: 2004-2007 Buick Rainier
2000-2009 Cadillac Escalade, ESV, EXT
2002-2009 Chevrolet Avalanche
2004-2009 Chevrolet Colorado
2003-2009 Chevrolet Express
2000-2009 Chevrolet Suburban, Tahoe
2000-2007 Chevrolet Silverado Classic
2007-2009 Chevrolet Silverado
2002-2009 Chevrolet Trailblazer
2004-2009 GMC Canyon
2002-2009 GMC Envoy
2000-2009 GMC Yukon, Yukon Denali, Yukon XL
2000-2007 GMC Sierra Classic
2007-2009 GMC Sierra
2003-2009 GMC Savana
Equipped With a Locking Rear Differential RPO G80
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
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.
Note 1: 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.
Note 2: This PI does not apply to vehicles equipped with a RPO G86 limited slip differential.
Recommendation/Instructions:
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 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.
Note 1: 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***