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Old 10-21-2013, 01:51 PM   #11
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Everyone who said to use a friction modifier on a G80 is probably having issues...DON'T use the friction modifier; as the correct people have chimed in and stated...it is not for the locking diff but rather a limited slip and those do not exist on any current 4WD Chevy/GMC trucks as far as a I know. I have the G80 also and love the way it performs in slick conditions. I've changed the lube in it 3 times and currently have the Amsoil 75w90 Severe Gear lube in it. No problems. There is are several good youtube videos on how it works...search Eaton G80 and you'll get several vids.
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Old 10-21-2013, 03:24 PM   #12
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I have the G80 and don't love it, and I don't hate it. It can actually cause you issues sometimes, other times its awesome.

My manual calls for fluid changes every 30k. Every 3rd party documentation I've read says to stick with the GM recommended fluid. My truck has 150k on it and no troubles with the drive train. Just keep up with the maintenance.
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Old 11-14-2013, 11:13 AM   #13
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GM locking rear diff.

What don't you like about the G80? I've only had trouble with mine once. It locked when I clipped a curb with the back tire (my fault) and I couldn't get it to unlock. I finally had to drive in reverse and steer back and forth until it opened up again.
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Old 12-04-2013, 07:03 PM   #14
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GM locking rear diff.

BTW, I am using Amsoil in my diffs, tranny and T-case...there's more than 30k between service changes. It protects the best...
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Old 12-05-2013, 02:10 PM   #15
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Quote:
Originally Posted by bbrown View Post
What don't you like about the G80? I've only had trouble with mine once. It locked when I clipped a curb with the back tire (my fault) and I couldn't get it to unlock. I finally had to drive in reverse and steer back and forth until it opened up again.
Didn't see your question until today. The locking rear end is only as good as the grip the tires can get. If both tires are on a slippery surface all your back end does is slide around and you go no where. In fact you can end up in a worse spot if that happens and you aren't ready for it. I've slip backward down hill because of this. Not a good feeling. But its like I said, its also awesome sometimes. Like when towing up a hill that has loose gravel.
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Old 12-05-2013, 07:46 PM   #16
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With this winter storm we have, I'm finding the locking diff pretty handy especially in 4wd. With the open diffs on my old suburban, in 4wd I would spin one tire on each axle. With the new pickup, in 4wd, once the back locks up I have three tires churning. Conclusion, one more tire working to get me in deeper!
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Old 12-06-2013, 11:29 AM   #17
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4 wheel drive, locking diffs, limited slip just means you can get farther into the yuck before you get stuck.
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