Busted G80?

[dannyukonxl]

i was going up my alleyway (inclined at about 5-6%)which is all iced over except for a little dry twist that just happened to be the width of the truck, so technically in 2wd i should be able to get up with my handy g80....................... im sitting there spinning, so wtf i pull back and keep the driver tire on a dry patch, punch it and nothing but wheel spin... last oil change was at 12k with mobil 1 75w90 and lsd additive, im at 25 now and im already planning to put some torco 75w90 and some additve and check for some teeth off the ramp pressure plate this weekend

 

also why do people call it a locker? a locker mechanically locks both axle shafts... the g80 locks both axle shafts at the discretion of the friction between the clutch plates at the end of the ramp plate

 

i dont really want this to turn into a rear diff oil war either, ive searched through plenty of those, im going with torco because it meets gl-6 requirements which is essentially for higher shock loads.. their additive is also ford or gm specific

[pwall]

.... keep the driver tire on a dry patch, punch it and nothing but wheel spin...

 

I'm not that knowledgeable in this area that much, but what I've been told, the 'locker' will only work if one wheel is spinning and the is not AND within a certain rpm range (wheel rpm). If you punched it, the wheel would be spinning too fast and thus the 'locker' would not cut in or it probably would self-destruct.

That's my understanding anyways.

[asilverblazer]

The clutch pack friction only determines when to lock, not how much. It is either locked or not.

[Zembonez]

I'd like to know the answer to this Q also. My neighbor with the G80 in his 2500HD 2WD has one wheel spinning all the way up the boat ramp every time we take our boats out. I have no issue with my plain rear axle driving out of the same ramp... A fact that really pisses him off by the way.

 

I'd say you guys with the G80 are getting hosed. This doesn't seem to be a very well designed limited slipper.

[pwall]

Found this video on youtube that describes how the G80 works.

http://www.youtube.com/watch?v=q6A-YNw8ddE&NR=1

[ATMINF]

The G80 will "lock up" at low speeds ( i think it is at 25mph and below), when it sees a certain rpm difference in one wheel vs the other wheel. The problem in both cases may be due to a higher wheel speed than the G80 is designed to enguage at.

1. To get the G80 to lock up you can't hammer on the gas,(with one tire spinning and the other not, if it did it would gernade the whole rear)you have to steadly get into the gas and keep on it and the rear will lock and both wheels will turn at the same speed. Some people will feel the rear lock and get outta the gas and this then "releases" or "unlocks" the rear and thus you don't get the "2wd".

2. The second guy with the boat ramp is similar to the first. He is going to fast and because of that the rear won't lock up.

You may ask okay Anthony how do you all this stuff? Well I had a G80 in my old 2001 3/4ton Suburban, and I also have a g80 in my current 3/4ton truck. I just got into some slick mud/clay last week and my G80 did what it was designed to do. I slowly go in the gas the rear lockup into "2wd" and pulled my truck out of the mud with very little drama. For my Suburban, when I was in Wisconsin, it work great several times in the snow/slush/ice to get the big truck moving.

Alot of using the G80 rear is knowing how the darn thing engauges and is designed to work. Basically slowly get into the gas, keep the speed below 25mph(to get your self outta trouble, then you can speed up)and stay at a steady gas modulation(don't just hammer on the gas pedal). I hope this helps.

[Fortune50]

Yes, the G80 is speed limited to 20 mph driveline speeds. Faster than that and it will either unlock automatically even if it was locked up to that point or not lock up at all if one tire started spinning while driving above those speeds.

So far as whether we're getting hosed, that's subject to interpretation and how you want your axles to perform in certain situations. I know mine worked fine in getting both wheels to spin to help me get out of my Dad's ditch even though one rear wheel was airborne. A "limited slip" or posi wouldn't work well in a situation where one of the wheels is free spinning, as it can only produce up to a very limited amount of force that the spring/clutches can produce themselves onto the other wheel w/ traction. So if the wheel w/ traction needed more than the amount of force the posi can produce to move the vehicle, it would be stuck.

[Draenor]

I'm with the majority.

 

 

 

 

 

And some people wonder why their G80 grenades.

 

 

............just floor it ya'll.

[ATMINF]

I have heard about the 1/2tons G80 breaking after some abuse, but sometimes it also because of larger tires and heavier rims. I have not heard of too many 14bolts G80 breaking though.

[Nice rig]

My G80 works just fine, in dirt, the boat ramp, or just slick road during a turn. I don't floor it...just keep easy pressure on the gas. I can feel when it does lock up because I of the "tire scrub" during a turn. 117,000 on the clock.

[Woodcutter]

I'm with the majority.

 

 

 

 

 

And some people wonder why their G80 grenades.

 

 

............just floor it ya'll.

 

!!! Well put.

[sonjaab]

The G80 works well for what it is ! Are you guys sure you even have one?

 

Anyhoo.......Check out the 07 Blundras so called "limited slip" (which in reality

is only a traction control like devise) in action vs. the GM G-80 unit!

Be prepared to laugh yer axx off !!!!!!!!!!!!!!!

 

They don't call it the blundra for nothing!

 

 

The boys over on the toyoyo threads have their panties in a knot and are crying foul!

[s-ten]

As other are saying, the G80 works good if you know how to use it. I have had one wheel off of the ground before in 2WD and still was able to make it through what I needed to. That would not have happened with a limited slip. Just take it easy until it locks, I think it takes a 250 RPM difference between the wheels and under 20-25 MPH.

[Zembonez]

As other are saying, the G80 works good if you know how to use it. I have had one wheel off of the ground before in 2WD and still was able to make it through what I needed to. That would not have happened with a limited slip. Just take it easy until it locks, I think it takes a 250 RPM difference between the wheels and under 20-25 MPH.

This is pretty good information. (as was the info from the rest of you) I didn't know how it operated and obviously neither does my buddy. I'm going to explain it to him and see what happens next time the boats go out. As always, good there is info to be had here. Thanks

[testdrive]

Just a little more about the G80 differential... This unit will make some strange noises when working as intended. In certain conditions you might feel the locking action and hear the latching up as you move along. This is normal and an indication that it is doing it's job. This unit is somewhat intelligent compared to the units that just add a friction clutch pack.