g80 - slip additive or not ?

[arctic388]

will do.

thanks
GB

 

[bowtiefreak]

I thought they did need the limited slip additive since it is a clutch type unit?

 

[AtomicHoe094]

thats what i thought..

 

[arctic388]

I googled it and found a majority says it is not required and do not use it and about 3 said to use it. based on what i read GM says not to use it. what i read described it as a mechanical locker not a limited slip device. I have already ordered it, it was a little over 6 dollars, so i just wont add it in unless it chatters bad. - just had a thought - do i need to add any in my front diff? maybe i didn't waste $6

 

[TigerEyz3]

The G80 is is centrifugally activated.

 

[bowtiefreak]

According to this:
http://www.youtube.com/watch?v=tTGZOJQQBeE&feature=related
it is both centrifugally activated and uses clutches and friction plates. but correct in the fact the limited slip additive is not needed.

"The maintenance schedule for the rear axle was developed by American Axle &
Manufacturing and GM truck based on multiple tests. The Eaton locker does
not require additional maintenance nor does it add heat to the lube. The
lube will darken due to the carbon wear on the clutch surfaces, much the
same as a disc brake pad & rotor. This does not damage axle components such
as seals or bearings. However, a new axle can produce excessive
temperatures (plus 350 degrees F) due to the ring & pinion breaking in that
will break the lube additives down. Avoid high loads, trailer towing and
high speed extended driving during the initial break in of the vehicle.
After the break in period axle temps will level at a much lower figure.
Lube changes are a good idea because the additives are replenished and
contaminates such as casting sand are eliminated. The axle is filled at the
factory with a synthetic 75w90 GL5 rating made by Texaco under part # 2276.
The GM service # is 12378261. This is the only lube we have done extensive
testing with to insure locker compatibility. The only negative to using one
of these other lubes is an increased potential for clutch chatter. This
really doesn't hurt anything and can be corrected by changing the lube. I
noticed in the latest GM owners manual the term "or equivalent" when
referring to the lube specification. Look for a GL5 rating on the bottle to
make sure the ring & pinion, seals & bearings are protected. Limited slip
additive is not needed."
The following information outlines the type of
rear axle lubrication utilized in GM Truck axles.
I. Fluid Type
II. The 1500, 2500 and 3500 GMT 800 Trucks utilize SAE 75W-90 Synthetic Axle Lubricant. The GM part number is 12378261 and the specification is 9986115."

 

[arctic388]

my G80 worked well. my open front just spun the non traction side.

 

[msark]

I changed mine this summer and added it. Didn't run as smooth as before so within 200 miles I drained the Lucas fluid and additive and replaced with the heavy duty Amsoil.... Had always thought Amsoil was a State Fair Booth hustle but read very positive comments... It was quiet and smooth right off the lift! The stuff is pricy but the difference was real ....

 

[arctic388]

I am an Amsoil dealer and that is the only brand I will use.

 

[msark]

Given you are a dealer you should believe their information and use the product without the additive!