Rear Differential Fluid Change

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HiHoeSilver

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Whats wrong?

Nothing. Just about 1000 threads about adding friction modifier or not with certain fluids to the g80. 2000 threads about whether the g80 is a locker or a limited slip...

I have found the best info to be the many youtube videos explaining the operation of the g80, as it is a unique beast that is difficult to label.

As for the fluid (like I said earlier in the thread), you're going to hear..."I added it", "I didn't add it and it's fine", "I didn't use it, but got some chatter, so i added it", "certain brands have it in there already", and then some...

Best as I can gather in having read MANY of these discussions, use the AC Delco part# from the manual and be done with it. A nice gasket like a LubeLocker doesn't hurt. Make sure the fill plugs come out before you remove the drain plugs.

Buy a TruTrac if you want to abuse this rear end for the long haul.
 

George B

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Nothing. Just about 1000 threads about adding friction modifier or not with certain fluids to the g80. 2000 threads about whether the g80 is a locker or a limited slip...

I have found the best info to be the many youtube videos explaining the operation of the g80, as it is a unique beast that is difficult to label.

As for the fluid (like I said earlier in the thread), you're going to hear..."I added it", "I didn't add it and it's fine", "I didn't use it, but got some chatter, so i added it", "certain brands have it in there already", and then some...

Best as I can gather in having read MANY of these discussions, use the AC Delco part# from the manual and be done with it. A nice gasket like a LubeLocker doesn't hurt. Make sure the fill plugs come out before you remove the drain plugs.

Buy a TruTrac if you want to abuse this rear end for the long haul.
I agree 100% and found this video helpful.
http://videos.eaton.com/detail/videos/vehicle/video/4930055429001/eaton-mlocker-g80-differential
 

HiHoeSilver

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Gotta love the mfr video. The music is a little much....

"Centrifugal force moves the pawls outwards to engage the latch..."
And then.....BOOM! The pieces of gears are easily swept up with a standard push broom.....

Also love that they say "maintenence free". Lol.

I like these...


I have blown up one G80 and it wasn't the diffs fault. I like them. An engineering feat with very practical performance, at the very least. However, if romping is the plan, forget it. Put a TruTrac in there and tell your buddy with the gravel driveway to watch his paint job.
 
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jakcol997

jakcol997

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Thank you guys so much for your help guys, I really really appreciate it!
 
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jakcol997

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Hahaha so before I even attempted to take the cover off I found out my fill hole is totally rounded out ☺️ So now idk wth to do..
 

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