The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-17-2013, 04:44 AM   #1
18436572GMC
Registered User
 
18436572GMC's Avatar
 
Join Date: Sep 2013
Location: iredell county, nc
Posts: 77
Eaton EO72

Any knowledge about this rear end would be helpful.
__________________
Real trucks have a clutch. Please inform automakers.

1972 GMC, K25, 383 stroker, SM465, NP205, Eaton HO-72
18436572GMC is offline   Reply With Quote
Old 10-17-2013, 05:14 AM   #2
jrdv
Registered User
 
jrdv's Avatar
 
Join Date: Apr 2000
Location: new mexico
Posts: 948
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.
Attached Images
    
jrdv is offline   Reply With Quote
Old 10-17-2013, 10:07 AM   #3
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,749
Re: Eaton EO72

^^^ There's your standard classic reply to that question.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
special-K is offline   Reply With Quote
Old 10-17-2013, 11:49 AM   #4
Fitz
Account Suspended
 
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
Re: Eaton EO72

Quote:
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.
Fitz is offline   Reply With Quote
Old 10-17-2013, 01:36 PM   #5
18436572GMC
Registered User
 
18436572GMC's Avatar
 
Join Date: Sep 2013
Location: iredell county, nc
Posts: 77
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.
__________________
Real trucks have a clutch. Please inform automakers.

1972 GMC, K25, 383 stroker, SM465, NP205, Eaton HO-72
18436572GMC is offline   Reply With Quote
Old 10-17-2013, 01:44 PM   #6
haminator
Registered User
 
haminator's Avatar
 
Join Date: Sep 2009
Location: Prescott Valley AZ
Posts: 345
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.
haminator is offline   Reply With Quote
Old 10-17-2013, 01:50 PM   #7
18436572GMC
Registered User
 
18436572GMC's Avatar
 
Join Date: Sep 2013
Location: iredell county, nc
Posts: 77
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.
__________________
Real trucks have a clutch. Please inform automakers.

1972 GMC, K25, 383 stroker, SM465, NP205, Eaton HO-72
18436572GMC is offline   Reply With Quote
Old 10-17-2013, 01:53 PM   #8
haminator
Registered User
 
haminator's Avatar
 
Join Date: Sep 2009
Location: Prescott Valley AZ
Posts: 345
Re: Eaton EO72

Yes, the Eaton No Spin. Iv'e seen a a couple on Ebay, kinda pricey. Real simple set up though.
haminator is offline   Reply With Quote
Old 10-17-2013, 04:46 PM   #9
Longhorn 70
Registered User
 
Longhorn 70's Avatar
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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.
__________________
1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11.
1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar

And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9
Longhorn 70 is offline   Reply With Quote
Old 10-17-2013, 04:50 PM   #10
68 TT
Still plays with trucks
 
68 TT's Avatar
 
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
Re: Eaton EO72

Quote:
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.
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577
69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E
79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars
68 TT is offline   Reply With Quote
Old 10-17-2013, 04:57 PM   #11
68 TT
Still plays with trucks
 
68 TT's Avatar
 
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
Re: Eaton EO72

Quote:
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.
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577
69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E
79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars
68 TT is offline   Reply With Quote
Old 10-19-2013, 02:39 AM   #12
swamp rat
Registered User
 
swamp rat's Avatar
 
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
Re: Eaton EO72

Use the search function and type in Eaton rear, or HO72, or HO52
__________________
Mike.

Swamp Rat build thread :
http://67-72chevytrucks.com/vboard/s...d.php?t=595019

72 3/4T 4X4
4" BDS Lift
33" BFG's
swamp rat is offline   Reply With Quote
Old 10-19-2013, 06:40 AM   #13
Tx Firefighter
Watch out for your cornhole !
 
Tx Firefighter's Avatar
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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.
Tx Firefighter is offline   Reply With Quote
Old 10-19-2013, 07:34 AM   #14
Mike C
Registered User
 
Mike C's Avatar
 
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
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.
__________________
44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
Mike C is offline   Reply With Quote
Old 10-19-2013, 08:40 AM   #15
D.PASSMORE
One of the First
 
D.PASSMORE's Avatar
 
Join Date: Jan 2000
Location: St. Augustine,FL.
Posts: 4,043
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.
__________________
DAVID PASSMORE
ST AUGUSTINE ,FL
ZIP 32084

'71 SWB K/10 CUSTOM DELUXE (Chili)
'72 BLAZER K/5 Muscle Truck (Mule)
'72 LWB K/20 CHEYENNE (Blackie)
D.PASSMORE is offline   Reply With Quote
Old 10-19-2013, 12:06 PM   #16
swamp rat
Registered User
 
swamp rat's Avatar
 
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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
__________________
Mike.

Swamp Rat build thread :
http://67-72chevytrucks.com/vboard/s...d.php?t=595019

72 3/4T 4X4
4" BDS Lift
33" BFG's
swamp rat is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:21 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com