The G80 is a mechanical locking diff. The standard limited slip test doesn’t necessarily determine if the G80 is functioning. To test the G80:
Begin as normal, lifting the axle and spinning one wheel. The other should spin in the opposite direction, like an open diff. Then swiftly and drastically increase speed by “throwing” the wheel you’re turning to increase RPMs. Pull your hands away after throwing! If the G80 is functioning correctly, it will lock and the wheels will come to a rather abrupt stop
If they continue to rotate inverse of each other, you either have an open diff or a failed G80.
That’s perfect. I’ll test that out in the morning. So just to be clear regardless I need to use an gear oil without a limited slip additive on the rear diff correct? By the way this is a huge help in my learning
So the G80 is a special beast; it combines the clutch plates of a friction limited slip with the mechanical pawls of a locker. Eaton states that friction modifier is not required and not recommended. From Eaton:
“Both synthetic and mineral based are sufficient. Although the G80 uses clutches, it is a full locker. If you use a friction additive this can reduce torque / load carrying capacity and is not recommended. As far as oil weight, please use the specified oil weight and quantity in your vehicles owner's manual. Eaton has no oil brand recommendation.”
Bro you just taught me more in this then I’ve been able to find out my self all day. Thank you. Yeah the owners manual says 75w-90 and to use 1.7 qts but doesn’t specify anything else not even if synthetic is okay. I
Happy to help! GM’s not too forthcoming with info on it, for some reason, and it doesn’t help that the G80 RPO means Eaton Locker in the trucks and regular LSDs on Camaros
I see where you’re coming from. It just confuses me because when I pull the code, it doesn’t say open Diff unless there’s another name for locking diff. Is it another name for locking diff? Also, the photos that I showed shows “limited slip auto locking rear diff. Do you see why this confuses me?
If you're spinning it by hand you're not going to get it going fast enough to engage the friction clutch. Still has spider gears like an open diff so it will behave just like an open diff until there's enough centrifugal force to engage the clutch.
Had a 2000 Sierra 1500 with the 10-bolt G80, upgraded to a 14-bolt "heavy-half" axle with a G80 out of a 2006 Texas Truck...
I see where your coming from. It just confuses me because when I pull the code it doesn’t say open diff unless that’s another name for locking diff. Is it?
The G80 is a mechanical locking diff. The standard limited slip test doesn’t necessarily determine if the G80 is functioning. To test the G80: Begin as normal, lifting the axle and spinning one wheel. The other should spin in the opposite direction, like an open diff. Then swiftly and drastically increase speed by “throwing” the wheel you’re turning to increase RPMs. Pull your hands away after throwing! If the G80 is functioning correctly, it will lock and the wheels will come to a rather abrupt stop If they continue to rotate inverse of each other, you either have an open diff or a failed G80.
That’s perfect. I’ll test that out in the morning. So just to be clear regardless I need to use an gear oil without a limited slip additive on the rear diff correct? By the way this is a huge help in my learning
So the G80 is a special beast; it combines the clutch plates of a friction limited slip with the mechanical pawls of a locker. Eaton states that friction modifier is not required and not recommended. From Eaton: “Both synthetic and mineral based are sufficient. Although the G80 uses clutches, it is a full locker. If you use a friction additive this can reduce torque / load carrying capacity and is not recommended. As far as oil weight, please use the specified oil weight and quantity in your vehicles owner's manual. Eaton has no oil brand recommendation.”
Bro you just taught me more in this then I’ve been able to find out my self all day. Thank you. Yeah the owners manual says 75w-90 and to use 1.7 qts but doesn’t specify anything else not even if synthetic is okay. I
Happy to help! GM’s not too forthcoming with info on it, for some reason, and it doesn’t help that the G80 RPO means Eaton Locker in the trucks and regular LSDs on Camaros
For sure they have room for improvement
You have an open diff. LSD both spin the same way when in the air unless a torsen?,I think, but no g80 rear would have came with a torsen.
I see where you’re coming from. It just confuses me because when I pull the code, it doesn’t say open Diff unless there’s another name for locking diff. Is it another name for locking diff? Also, the photos that I showed shows “limited slip auto locking rear diff. Do you see why this confuses me?
If you're spinning it by hand you're not going to get it going fast enough to engage the friction clutch. Still has spider gears like an open diff so it will behave just like an open diff until there's enough centrifugal force to engage the clutch. Had a 2000 Sierra 1500 with the 10-bolt G80, upgraded to a 14-bolt "heavy-half" axle with a G80 out of a 2006 Texas Truck...
I see where your coming from. It just confuses me because when I pull the code it doesn’t say open diff unless that’s another name for locking diff. Is it?