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Old 10-17-2013, 04:44 AM   #1
18436572GMC
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Eaton EO72

Any knowledge about this rear end would be helpful.
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Old 10-17-2013, 05:14 AM   #2
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Re: Eaton EO72

I've had this truck since 2008 and use it as a work truck. I've had no trouble with the eaton rear end and it has been used hard. I hear they are hard to find parts for, but fortunately I have had zero trouble with mine.
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Old 10-17-2013, 10:07 AM   #3
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Re: Eaton EO72

^^^ There's your standard classic reply to that question.
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Old 10-17-2013, 11:49 AM   #4
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Re: Eaton EO72

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Originally Posted by 18436572GMC View Post
Any knowledge about this rear end would be helpful.
The factoru overhaul manual contains complete rebuild instructions for both the Eaton single and two speed differentials.
Thirty bucks from:
http://www.themotorbookstore.com/st1...FYw1QgodPl0ALg

Well worth the price.
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Old 10-17-2013, 01:36 PM   #5
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Re: Eaton EO72

Thanks for the replies. I am looking at a K20 with one on it and quite honestly have never worked with one.
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Old 10-17-2013, 01:44 PM   #6
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Re: Eaton EO72

I just took one apart. They are brutal. Iv'e had low mileage 14 bolts fall apart. If you keep oil in it, it will most likely last forever. The pinion bearing is huge.
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Old 10-17-2013, 01:50 PM   #7
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Re: Eaton EO72

Thanks, that is good to know. Does anyone make a posi or locker for this axle? I do not know of any.
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Old 10-17-2013, 01:53 PM   #8
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Re: Eaton EO72

Yes, the Eaton No Spin. Iv'e seen a a couple on Ebay, kinda pricey. Real simple set up though.
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Old 10-17-2013, 04:46 PM   #9
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Re: Eaton EO72

I have an Eaton with around 400K on the clock. It isn't noisy. I keep the oil changed in it I want to say I put in LT7 or JL7?? brand oil....It is what my uncle used for the semi's he drove. It has been loaded down heavy, driven fast and pulled TONS. Now the bad news...The breaks are so so on it because the parts are pricey. Look HERE for some additional information on the Eatons.
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Old 10-17-2013, 04:50 PM   #10
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Re: Eaton EO72

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Originally Posted by Longhorn 70 View Post
I have an Eaton with around 400K on the clock. It isn't noisy. It has been loaded down heavy, driven fast and pulled TONS. Now the bad news...The breaks are so so on it because the parts are pricey. Look HERE for some additional information on the Eatons.
x2

My 68 C20 has the Eaton HO72 in it with 437,000 miles on it. Still going strong.
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Old 10-17-2013, 04:57 PM   #11
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Re: Eaton EO72

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Originally Posted by 18436572GMC View Post
Thanks, that is good to know. Does anyone make a posi or locker for this axle? I do not know of any.
The 14-bolt posi and locker differentials fit into the HO52 & HO72 carriers so you can pick one up pretty easily used that will work in your existing rear end.

Be careful, that drop out pumpkin weighs a lot. Much more than the 9" pumpkins I have pulled many times. Probably 100 pounds+. Better off pulling the tin cover off the back of the axle housing and just removing the carrier & ring gear assembly leaving the drop out pumpkin & pinion gear in place.
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Old 10-19-2013, 02:39 AM   #12
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Re: Eaton EO72

Use the search function and type in Eaton rear, or HO72, or HO52
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Old 10-19-2013, 06:40 AM   #13
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Re: Eaton EO72

The guys on Pirate 4x4 are wild about them. They're tough units, so much so that even those maniacs over there don't bust them.

Heck, there's guys over there converting them to front axles. Think about the logistics of that swap, cutting the axle tubes off and splicing on tubes with steering knuckles, then figuring out the bearings, seals, and drive shafts for each side.
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Old 10-19-2013, 07:34 AM   #14
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Re: Eaton EO72

Quote:
Originally Posted by 68 TT View Post
The 14-bolt posi and locker differentials fit into the HO52 & HO72 carriers so you can pick one up pretty easily used that will work in your existing rear end.
This is true. Except note that you have to use the 14 bolt axle shafts since the spline count is different.
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Old 10-19-2013, 08:40 AM   #15
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Re: Eaton EO72

I had a complete rebuild on mine a few years ago. New locker and axles. The shop upgraded the axles to fit the locker. So, they can be rebuilt.
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Old 10-19-2013, 12:06 PM   #16
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Re: Eaton EO72

Now that i have some time on my hands, here are some threads i searched up and subscribed too.

http://67-72chevytrucks.com/vboard/s...d.php?t=200268
http://67-72chevytrucks.com/vboard/s...d.php?t=401974
http://67-72chevytrucks.com/vboard/s...d.php?t=183452
http://67-72chevytrucks.com/vboard/s...d.php?t=172827
http://67-72chevytrucks.com/vboard/s...d.php?t=177514
http://67-72chevytrucks.com/vboard/s...d.php?t=391609
http://67-72chevytrucks.com/vboard/s...d.php?t=236743
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