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10-19-2013, 09:05 PM
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#1
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Member
Join Date: Jul 2013
Posts: 45
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GM locking rear diff.
I bought a used GMC 2500 and finally got around to checking all the RPO's and I found that the truck has a locking rear differential. Any towers out there have one and can give me your thoughts?
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10-19-2013, 10:15 PM
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#2
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Senior Member
Join Date: Jul 2013
Location: Renton
Posts: 517
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Year?
__________________
Michael
Old setup:
2004 Chevrolet Silverado 3500 LT with a 2004 Jayco JayFlight 29BHS
2014 Greyhawk 31FS with a 2007 Tahoe toad
New setup:
2014 Thor Palazzo 33.3 with a 2017 Ford Explorer toad
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10-20-2013, 04:39 AM
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#3
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Senior Member
Join Date: Oct 2011
Location: "Where we Park It"
Posts: 1,071
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Make sure you change the rear ends gear oil with proper oil and additive for the GM Locking rear axle.
As the gear oil get older, the rear locking clutches will start popping when you make a turn and the oil is hot or is the axle being used under a load.
__________________
Robert & Bale the "Traveling Dog"
SOB
2012 GMC 3500HD DRW
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10-20-2013, 06:48 AM
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#4
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Senior Member
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 10,714
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I have it and love it... just change your rear diff fluid on a regular basis. I use Royal Purple it already has the friction modifier added.
__________________
Seann
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 900watts of solar, Lithium batteries (400amp hour), 2000 watt (4000 surge) whole house inverter.
145days boondockinig in2023 2022/151 2021[/COLOR]
93/2020,157/2019219/2018 206/2017,215/2016, 211/2015, 196/14, 247/13, 193/12
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10-20-2013, 07:45 AM
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#5
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Senior Member
Join Date: Feb 2012
Location: Friendswood
Posts: 917
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GM locking rear diff.
I have it also and love it. Like said above keep the fluid changed every 50,000 miles and they will go for ever. The nice part is when changing the lube is you don't have to remove the cover. You will find a drain plug on the bottom and that makes it so easy and fast. All the the rear axles use 75/ 90w synthetic lube and then you will need a bottle of friction modifier. Add the friction modifier first when filling then it will take 3 qts of lube and you will be good to go.
You can use any brand that you like as i have seen no difference in performance of different brands when serviced at regular basis.
Hope this helps.
Robert
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10-20-2013, 12:50 PM
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#6
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Member
Join Date: Jul 2013
Posts: 45
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Quote:
Originally Posted by msturtz
Year?
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2005 GMC 2500HD quad cab 6.0
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10-20-2013, 05:44 PM
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#7
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Senior Member
Join Date: Oct 2011
Location: Missouri
Posts: 138
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I thought friction modifier was only for limited slip differentials??? OP has a locking diff.
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2011 Jayco Jay Flight 24RKS
2011 Ford F-150 XLT SC 4X4 5.0L, 3.73
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10-20-2013, 05:58 PM
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#8
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Site Team
Join Date: Nov 2010
Location: Virginia`s Eastern Shore
Posts: 17,091
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I have the G80 locking rear on both my Chevy trucks. No issues towing or not. The 04 2500 has the drain plug on the bottom which is nice, but my 04 1500 does not, have to remove the cover to drain.
Also found this on a search:
LOCKING DIFFERENTIAL LUBRICANT (SERVICE INFORMATION) #91-4-109
SUBJECT: LOCKING DIFFERENTIAL (G80) LUBRICANT - (SERVICE INFORMATION)
VEHICLES AFFECTED: ALL LIGHT TRUCKS EQUIPPED WITH G80 REAR AXLE ALL YEARS
Some light duty trucks equipped with locking rear axles (G80) may exhibit rear axle chatter, especially when turning a corner from a stop.
This condition of alternate engagement and disengagement of clutches in differential assembly is usually caused by contaminated axle lubricant.
To correct this condition, drain and refill the rear axle with SAE 80W-90 GL5 (P/N 10950849). 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.
VEHICLES/COMPONENTS INVOLVED: ----------------------------- Some light duty trucks equipped with locking rear axles, RPO G80.
SERVICE PARTS INFORMATION:
Part Number Description ----------- ------------------ 10950849 Lubricant, Rear Axle (1 litre)
Parts are currently available through CANSPO.
WARRANTY INFORMATION:
As specified in Light Duty Truck Maintenance Schedules, locking rear axle fluid drain and refill is required owner maintenance at the first engine oil change. Failure to drain and refill the rear axle as specified may contribute to a later axle chatter condition. Refer to the appropriate Light Duty Truck Maintenance Schedule or service manual, section OB, for further details on change intervals.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those 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 properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
© Copyright General Motors Corporation. All Rights Reserved.
__________________
2017 Coachmen Catalina 283RKS
2018 Ford F250 Super Duty 6.2l CCSB
2010 Jayflight 28BHS (sold)
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10-21-2013, 06:50 AM
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#9
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Senior Member
Join Date: Feb 2012
Location: Friendswood
Posts: 917
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GM locking rear diff.
Quote:
Originally Posted by tls001
I thought friction modifier was only for limited slip differentials??? OP has a locking diff.
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You are correct. Guess i should learn to read better. Lol my bad
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10-21-2013, 11:51 AM
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#10
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Senior Member
Join Date: Mar 2013
Location: CENTRAL NEW YORK
Posts: 984
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I have always used Mobil 1 synthetic 75W-90 in all GM trucks with the G80 Eaton and never had a problem. My last Avalanche went 140K with no issues. I also use it in the front Diff. Now my TBSS uses the friction modifier as she has a limited slip, not a locking..
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2013 33 RLDS
2004 Chevy Avalanche 2500 8.1
2019 Jeep Cherokee Limited 3.2
2016 CTS 4 2.0T
2001 Oldsmobile Aurora 4.0
2015 Chrysler 200C AWD
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10-21-2013, 12:51 PM
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#11
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Senior Member
Join Date: May 2013
Location: Raleigh, NC
Posts: 100
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Everyone who said to use a friction modifier on a G80 is probably having issues...DON'T use the friction modifier; as the correct people have chimed in and stated...it is not for the locking diff but rather a limited slip and those do not exist on any current 4WD Chevy/GMC trucks as far as a I know. I have the G80 also and love the way it performs in slick conditions. I've changed the lube in it 3 times and currently have the Amsoil 75w90 Severe Gear lube in it. No problems. There is are several good youtube videos on how it works...search Eaton G80 and you'll get several vids.
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Bart and Tina
2001 Chevy 2500HD 6.0 Silverado 4x4-Banks Power
1997 Jayco Eagle 5er 285BHS-flipped axles
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10-21-2013, 02:24 PM
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#12
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Senior Member
Join Date: May 2013
Location: SE Wisconsin
Posts: 3,430
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I have the G80 and don't love it, and I don't hate it. It can actually cause you issues sometimes, other times its awesome.
My manual calls for fluid changes every 30k. Every 3rd party documentation I've read says to stick with the GM recommended fluid. My truck has 150k on it and no troubles with the drive train. Just keep up with the maintenance.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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11-14-2013, 11:13 AM
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#13
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Senior Member
Join Date: May 2013
Location: Raleigh, NC
Posts: 100
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GM locking rear diff.
What don't you like about the G80? I've only had trouble with mine once. It locked when I clipped a curb with the back tire (my fault) and I couldn't get it to unlock. I finally had to drive in reverse and steer back and forth until it opened up again.
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Bart and Tina
2001 Chevy 2500HD 6.0 Silverado 4x4-Banks Power
1997 Jayco Eagle 5er 285BHS-flipped axles
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12-04-2013, 07:03 PM
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#14
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Senior Member
Join Date: May 2013
Location: Raleigh, NC
Posts: 100
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GM locking rear diff.
BTW, I am using Amsoil in my diffs, tranny and T-case...there's more than 30k between service changes. It protects the best...
__________________
Bart and Tina
2001 Chevy 2500HD 6.0 Silverado 4x4-Banks Power
1997 Jayco Eagle 5er 285BHS-flipped axles
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12-05-2013, 02:10 PM
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#15
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Senior Member
Join Date: May 2013
Location: SE Wisconsin
Posts: 3,430
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Quote:
Originally Posted by bbrown
What don't you like about the G80? I've only had trouble with mine once. It locked when I clipped a curb with the back tire (my fault) and I couldn't get it to unlock. I finally had to drive in reverse and steer back and forth until it opened up again.
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Didn't see your question until today. The locking rear end is only as good as the grip the tires can get. If both tires are on a slippery surface all your back end does is slide around and you go no where. In fact you can end up in a worse spot if that happens and you aren't ready for it. I've slip backward down hill because of this. Not a good feeling. But its like I said, its also awesome sometimes. Like when towing up a hill that has loose gravel.
__________________
Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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12-05-2013, 07:46 PM
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#16
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Member
Join Date: Jul 2013
Posts: 45
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With this winter storm we have, I'm finding the locking diff pretty handy especially in 4wd. With the open diffs on my old suburban, in 4wd I would spin one tire on each axle. With the new pickup, in 4wd, once the back locks up I have three tires churning. Conclusion, one more tire working to get me in deeper!
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12-06-2013, 11:29 AM
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#17
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Senior Member
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 10,714
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4 wheel drive, locking diffs, limited slip just means you can get farther into the yuck before you get stuck.
__________________
Seann
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 900watts of solar, Lithium batteries (400amp hour), 2000 watt (4000 surge) whole house inverter.
145days boondockinig in2023 2022/151 2021[/COLOR]
93/2020,157/2019219/2018 206/2017,215/2016, 211/2015, 196/14, 247/13, 193/12
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