JustLabs
Washington State
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Joined: 05/13/2002
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Is the G80 truly a locker or is it more of a limited slip? The G80 comes up all the time around here,and there always seems to be some confusion as to what it really is. GM calls it a locker,eaton calls it a locker,but it seems to be more of a hybrid. What do you think?
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2007 Keystone Cougar 289BHS Fifth Wheel.
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BenK
SF BayArea
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Joined: 04/18/2002
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Go to Eaton site and read up.
Here's link: http://automotive.eaton.com/product/traction_stability/lockingdiff.html
-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
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Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
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chevydieselfan
Bowling Green, KY, US
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Joined: 09/24/2003
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From my understanding G80 is a limited-slip positive traction device. I just got done having an Eaton unit put in my 1978 Malibu and it is limited-slip.
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Highbeam
Buckley, Washington
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The G80 is not a limited slip. It is a locker with a goofy mechanism used to lock it up. The goofy mechanism causes confusion.
If I jack up one wheel and spin it quickly by hand it will clunk to a stop all of the sudden. Once clunked to a stop the locker has engaged and will remain locked until I roll the wheel the other way.
Really, it locks up. I can torque my lug nuts this way. A limited slip will not work this way.
1998 Chevy ECSB, K1500, 5.7 V8, AM trans temp and vacuum gauges. Scangauge. HD light harness with 4hi. Timbren overloads. 168,000 miles.
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witxga
Appleton, WI
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Joined: 09/11/2003
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G80 is a locker. When a 100 r.p.m. speed difference is detected, the system will lock. It disengages once speed hits 20 m.p.h.
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BenK
SF BayArea
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Joined: 04/18/2002
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Seems no one really wants to use the hot link, so here's the text below.
It is a locker, the manufacturer says so.
======================================================================
Availability
¨ Standard Equipment on Dual Wheel 3500 Series trucks.
¨ Optional Equipment (G80 Order Code) on all GM two-wheel and four-wheel drive light trucks and sport utilities.
Benefits
¨ Improved traction differentiates the vehicle relative to other rear wheel and four-wheel drive vehicles on the market.
¨ Functions as a limited slip differential during normal driving conditions; provides full axle lock when needed.
¨ Maintenance free; requires no lube additives.
¨ Enhanced towing and off-road performance.
¨ Patented carbon friction disc technology enhances performance and durability while reducing warranty claims.
Principles of Operation
¨ Wheel speed difference (left to right) in excess of 100 RPM will cause a flyweight mechanism to open and catch a latching bracket.
¨ The stopped flyweight will trigger a self-energizing clutch system, which results in the cam plate ramping against a side gear.
¨ Ramping increases until both axles turn at the same speed (full lock), which prevents further wheel slip.
¨ At speeds above 20MPH, the latching bracket swings away from the governor and prevents lockup from occurring.
Technical Specifications
¨ Automatic locking takes place within a fraction of a second, so smoothly that it is unnoticed by the average driver.
¨ Unlocking occurs automatically, once the need for improved traction is gone, and is unnoticeable to the average driver.
¨ Compatible with anti-lock brake systems.
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2500hdw/fiver
Beaverton, OR
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Just some more info. When reffering to the G80, which is a the abbreviation listed on the RPO label of the vehicle.
This could mean the vehicle could have a limited slip or a locker. It is basically a generic code for a (traction aiding device in the rear axle). Different vehicle will have different types of these, such as a 1/2 ton truck would have a gov-lock(locker), one ton truck having a clutch pack style posi with no weighted cam device(limited slip). And also some of the GM limited slips need a posi additive installed, this is to allow them to slip the clutches smoothly around a corner, a gov-lock style does not need this becuase it is completely disengaged during a corner(no preload on the clutch pack).
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robsawatsky
Richmond, BC, Canada
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I believe G80 has been used exclusively for the Eaton locker for quite a while. There is another Gcode for clutch-type, true limited-slip diff's like those used on Camaro, Corvette, Firebird and the like.
Rob Sawatsky
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Lone Eagle
Tremonton, Utah
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Works great. I am glade I have it. Later! Frank
2002 2500HD Duramax/Allison
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tundracamper
Southeast US
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According to the manual, the G86 is the "Axle Limited-Slip," while G80 is the "Axle Positraction Limited Slip."
If you happen to catch the 1/2 hour long GMC commercial (comes on several times early on Saturday in my area), they call it a "locking differential" several times. In that commercial, they actually take a cheap shot at limited slips. They show a Sierra with a rear wheel off the ground. As soon as the wheel spins the differential locks, and off the truck goes. Then they show a Dodge and it cannot make it through the same ditch as the limited-slip differential does not provide enough traction. Real cool!! They don't specifically mention Eaton. But as others have stated, the Eaton site clearly notes the G80 and calls it a locking model.
This is good info to know, as the locking differential does not require the friction modifier that limited-slip models require - as I discovered from this forum! That's good to know as my dealer was not aware of this.
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tundracamper
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