limited slip diff type?

[j91z28d1]

anyone know what the name of this type of limit slip diff is? I'd like to look into rebuild kits, like clutches and stuff. but never seen one like this?

any idea who makes it for gm?

 

[swathdiver]

anyone know what the name of this type of limit slip diff is? I'd like to look into rebuild kits, like clutches and stuff. but never seen one like this?

any idea who makes it for gm?

This axle is made by AAM (www.demandaam.com) and is a locking limited slip. It does both when one wheel begins to slip and that counterweight engages the other wheel when rpms differ by about 200.

Great system, very reliable but not made for drag racing or burnout competitions.

What kind of car is this in?

 

[j91z28d1]

This axle is made by AAM (www.demandaam.com) and is a locking limited slip. It does both when one wheel begins to slip and that counterweight engages the other wheel when rpms differ by about 200.

Great system, very reliable but not made for drag racing or burnout competitions.

What kind of car is this in?

it's in a 2011 yukon. I just changed diff fluid and never seen this type before. interesting. I usually do car stuff, that's probably why then.

 

[swathdiver]

it's in a 2011 yukon. I just changed diff fluid and never seen this type before. interesting. I usually do car stuff, that's probably why then.

A regular Yukon and not a Denali, it will be in an 8.6" 10-bolt, very similar to the center section used in the Buick Grand National and an enlarged version of the 7.5" axle used in the Monte Carlo, Grand Prix, Regal, Cutlass, etc.

That locking/limited slip feature was added to the truck axles around 1985.

 

[EducatorDan]

https://www.eaton.com/us/en-us/catalog/differentials/mlocker.html

It's the Eaton G80 unit made for GM. They've been using it for decades and I wouldn't want a RWD/4wd GM truck/SUV without one.

 

[Caddylack]

https://www.eaton.com/us/en-us/catalog/differentials/mlocker.html

It's the Eaton G80 unit made for GM. They've been using it for decades and I wouldn't want a RWD/4wd GM truck/SUV without one.

Can you clarify this statement?

Obviously G80 doesn't refer to any specific part. That's just the RPO that tells you the vehicle doesn't have an open diff.

You're saying GM has been using that same diff for decades? In what?

Just for reference, the 1996 Impala SS had an Auburn "G80" that was crap. That's an 8.5" 10-bolt.

 

[BlaineBug]

 

[swathdiver]

Can you clarify this statement?

Obviously G80 doesn't refer to any specific part. That's just the RPO that tells you the vehicle doesn't have an open diff.

You're saying GM has been using that same diff for decades? In what?

Just for reference, the 1996 Impala SS had an Auburn "G80" that was crap. That's an 8.5" 10-bolt.

Car G80 and truck G80 are different since about 1985.

 

[j91z28d1]

so it would seem it has cluch packs but it's called a locker, so it's not really meant to slip. so no limited slip additives needed. interesting. the fluid I used was for a Lsd haha

I guess the real question that I had but can't find is can it be rebuilt? mine has a tons of the metal goo on the magnetic and the gear set inside looked very sloppy. no noise or anything from the ring and pinion when driving. so that's left me wondering if these are just super sloppy because if all the mechanical stuff.

I'll let it ride and see how it goes, maybe change the fluid in a year or so and see if it's still leaving metal paste. I'm sure it hasn't been changed in the 140k miles that's on it. fluid didn't look to bad though. just more build up than I've ever seen in a rear end that wasn't blown up haha

 

[BlaineBug]

so it would seem it has cluch packs but it's called a locker, so it's not really meant to slip. so no limited slip additives needed. interesting. the fluid I used was for a Lsd haha

I guess the real question that I had but can't find is can it be rebuilt? mine has a tons of the metal goo on the magnetic and the gear set inside looked very sloppy. no noise or anything from the ring and pinion when driving. so that's left me wondering if these are just super sloppy because if all the mechanical stuff.

I'll let it ride and see how it goes, maybe change the fluid in a year or so and see if it's still leaving metal paste. I'm sure it hasn't been changed in the 140k miles that's on it. fluid didn't look to bad though. just more build up than I've ever seen in a rear end that wasn't blown up haha

For a while I was misinformed as well, thinking it was a locker, but apparently it does have clutch packs, but it seems as though they are never under constant tension like a traditional limited slip is. It's probably a dumbed down limited slip to ensure that your average driver doesn't slide out on turns at speed due to having both rear wheels "locked" at all times like a traditional limited slip provides. Although the G80 performs better than "dumbed down," please excuse my verbiage.

My experience with Ford's 8.8 limited slip uses a Z-shaped SPRING to constantly tension the clutch packs, but then once they are locked the spring no longer is needed, that's apparently just used for initial break away when under low torque.

 

[j91z28d1]

For a while I was misinformed as well, thinking it was a locker, but apparently it does have clutch packs, but it seems as though they are never under constant tension like a traditional limited slip is. It's probably a dumbed down limited slip to ensure that your average driver doesn't slide out on turns at speed due to having both rear wheels "locked" at all times like a traditional limited slip provides. Although the G80 performs better than "dumbed down," please excuse my verbiage.

My experience with Ford's 8.8 limited slip uses a SPRING to constantly tension the clutch packs, but then once they are locked the spring no longer is needed, that's apparently just used for initial break away when under low torque.

that's how I take it too, especially how there's a 2nd weight that over about 20mph it locks out the locker spinning part so you in theory have a clutch based locker from 0mph to about 20mph if one wheel spins faster than the other.

which sounds about right for a daily driver truck. if a truck rear end slid out 3in around a corner on power average driver would freak out, over correct and drive head on into something solid or other cars. so while this thing called a Gov-lok is a pretty good oem solution without needing electronics to control it. down side seems they are weak and break pretty easily compared to a true locker or Lsd used in cars.

sadly my transfer case fluid was black and lots of build up on that magnet too. makes me wonder how this yukon was used haha. drive train must have had a bit of a rough life. or these need more maintenance than just never do it haha.

 

[BlaineBug]

that's how I take it too, especially how there's a 2nd weight that over about 20mph it locks out the locker spinning part so you in theory have a clutch based locker from 0mph to about 20mph if one wheel spins faster than the other.

which sounds about right for a daily driver truck. if a truck rear end slid out 3in around a corner on power average driver would freak out, over correct and drive head on into something solid or other cars. so while this thing called a Gov-lok is a pretty good oem solution without needing electronics to control it. down side seems they are weak and break pretty easily compared to a true locker or Lsd used in cars.

sadly my transfer case fluid was black and lots of build up on that magnet too. makes me wonder how this yukon was used haha. drive train must have had a bit of a rough life. or these need more maintenance than just never do it haha.

If you have an "auto" transfer case then it too has clutches inside with clutch material that gets into the fluid.

 

[j91z28d1]

If you have an "auto" transfer case then it too has clutches inside with clutch material that gets into the fluid.

yep its an auto. car fax said it spend some time in Colorado, got me thinking they drove around in auto not 2wd like the manual recommends.

do you know if the clutches have metallic in them that would stick to a magnet

 

[Caddylack]

Car G80 and truck G80 are different since about 1985.

But they've really been using the same unit for that long? It blows my mind that they didn't upgrade or improve at all.

Then again, why reinvent the wheel?

 

[BlaineBug]

yep its an auto. car fax said it spend some time in Colorado, got me thinking they drove around in auto not 2wd like the manual recommends.

do you know if the clutches have metallic in them that would stick to a magnet

One of my acquaintances has a 2016 V6 Silverado and I notice his selector is always in auto mode.

 

[j91z28d1]

One of my acquaintances has a 2016 V6 Silverado and I notice his selector is always in auto mode.

If his owner's manual is anything like mine it specifically says not to drive around unnecessarily in auto. It's more for when you're on slick surfaces or off-road gravel and it needs to respond quickly to transfer torque to the front wheels but unnecessary wear and tear when driving around town on dry streets, that's how I understand it. At bare minimum stay on top of fluid changes often.

my fluid looked like black water and this was the magnet plug on mine, probably 140k never changed thou.

 

[swathdiver]

One of my acquaintances has a 2016 V6 Silverado and I notice his selector is always in auto mode.

I think the transfer case needs overhaul after about 70K of straight Auto use. This is my figure based on previous posts across this and other forums of folks complaining of TC problems at around 60-70K miles where they left the TC in Auto all the time.

 

[BlaineBug]

I think the transfer case needs overhaul after about 70K of straight Auto use. This is my figure based on previous posts across this and other forums of folks complaining of TC problems at around 60-70K miles where they left the TC in Auto all the time.

That seems low. In auto mode it's no different than any other full time all wheel drive car on the market. Some of the pre-2015 model GM SUVs were full time AWD and had no selectable 2 wheel drive option.

 

[j91z28d1]

my understanding it's completely different. awd cars use viscous coupling.

 

[swathdiver]

That seems low. In auto mode it's no different than any other full time all wheel drive car on the market. Some of the pre-2015 model GM SUVs were full time AWD and had no selectable 2 wheel drive option.

It's very different, the AWD transfer case is like having a 3rd center section to prevent wheel hop.

When in Auto the front axle and driveshaft are engaged and turning but the computer is waiting to decide how much power to transfer from the back to the front.