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 > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-22-2013, 05:37 PM   #51
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,188
Re: Eaton HO72/HO52 vs. 14 Bolt FF

HO72 Pinion Bearings!!!!

National and Timken A1011
O.D. 4.330"
I.D. 1.9675"
Width 2.5"

National and Timken M5205EL (1.25" pilot)
O.D. 2.0472"
I.D. 1.2677"
Width 0.8125"

National and Timken MUB5205UM (1.00" pilot)
O.D. 2.0472"
I.D. 0.9843"
Width 0.8125"
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 11-03-2013, 09:25 AM   #52
mechanixman
Registered User
 
mechanixman's Avatar
 
Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 788
Re: Eaton HO72/HO52 vs. 14 Bolt FF

This really is a great thread.
I had a question. (I'm afraid I may already know the answer)
63GMCkid mentioned that the carriers are somewhat similar.
Is there anyway someone could fit a posi unit in a HO72?

Thanks
__________________
-Nick

Projects:
1952 Chevy 1 ton = The Build page
mechanixman is offline   Reply With Quote
Old 11-03-2013, 12:15 PM   #53
Longhorn 70
Registered User
 
Longhorn 70's Avatar
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I thought I posted this question once before but it isn't here so, asking again. Does this bolt on the side of the diff mean it's an HO72? Is this the basic difference between a 52 and a 72?
Attached Images
 
__________________
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 11-03-2013, 12:17 PM   #54
Longhorn 70
Registered User
 
Longhorn 70's Avatar
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Originally Posted by mechanixman View Post
This really is a great thread.
I had a question. (I'm afraid I may already know the answer)
63GMCkid mentioned that the carriers are somewhat similar.
Is there anyway someone could fit a posi unit in a HO72?

Thanks
Good news from what I read here Nick, YES.

Get the Detroit Locker for a 14 bolt and use shortened, by .250" or so, 14 bolt axles. Look at THIS ENTRY for the "guts swap"
__________________
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 11-03-2013, 12:31 PM   #55
swamp rat
Senior Member
 
swamp rat's Avatar
 
Join Date: Oct 2007
Location: Spanaway
Posts: 8,201
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Originally Posted by Longhorn 70 View Post
I thought I posted this question once before but it isn't here so, asking again. Does this bolt on the side of the diff mean it's an HO72? Is this the basic difference between a 52 and a 72?
No the HO52's can have them as well.

http://67-72chevytrucks.com/vboard/s...d.php?t=595571

Here's some good info:

http://67-72chevytrucks.com/vboard/s...d.php?t=590959
__________________
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

Last edited by swamp rat; 11-03-2013 at 12:43 PM.
swamp rat is online now   Reply With Quote
Old 11-04-2013, 10:30 AM   #56
Longhorn 70
Registered User
 
Longhorn 70's Avatar
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
Re: Eaton HO72/HO52 vs. 14 Bolt FF

OK I thing I got it. Decode the numbers on the diff is the only way to tell.
__________________
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 11-04-2013, 11:10 AM   #57
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,188
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Does your SPID say if you have a 7200# or 5200# rear GAWR? I'll have to look into that more, but I can say the load bolt is not the difference. I think the brakes are the difference
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 11-05-2013, 02:52 PM   #58
Longhorn 70
Registered User
 
Longhorn 70's Avatar
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I did see 7200# on the chrome tag on the door post. I'll post a pic. Also would the Aux Spring option G60 mean anything?

Here is Mr SPID
Attached Images
 
__________________
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 11-05-2013, 09:41 PM   #59
Longhorn 70
Registered User
 
Longhorn 70's Avatar
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
Re: Eaton HO72/HO52 vs. 14 Bolt FF

It looks like I read the tag wrong. As I have the original rear end, it seems it's a HO52
Attached Images
 
__________________
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 11-06-2013, 09:35 PM   #60
Angryman117
Registered User
 
Join Date: Jul 2013
Location: Olalla, WA
Posts: 194
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I need some help identifying my axle. I know its an Eaton 8-lug with the numbers HGI20 stamped on it. I have tried multiple Google searches and nothing. Any ideas anyone?
__________________
Angryman117's
47 Chevy Build
89 Silverado Z71 LS Swap
Angryman117 is offline   Reply With Quote
Old 11-06-2013, 11:20 PM   #61
swamp rat
Senior Member
 
swamp rat's Avatar
 
Join Date: Oct 2007
Location: Spanaway
Posts: 8,201
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Probably going to have to know what year but also find someone that has a Rear Axle Identification chart for that year too.. Ir maybe try "Rear Axle Identification chart and year" ??
__________________
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 online now   Reply With Quote
Old 11-06-2013, 11:45 PM   #62
Bigdav160
Registered User
 
Bigdav160's Avatar
 
Join Date: Apr 2011
Location: Klein Texas
Posts: 2,582
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Also would the Aux Spring option G60 mean anything?
__________________
My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
Bigdav160 is offline   Reply With Quote
Old 11-07-2013, 12:18 AM   #63
swamp rat
Senior Member
 
swamp rat's Avatar
 
Join Date: Oct 2007
Location: Spanaway
Posts: 8,201
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Maybe just an overload single spring?
__________________
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 online now   Reply With Quote
Old 11-07-2013, 12:32 AM   #64
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,188
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I think BigDav160 was posting the G60 Spring option for Longhorn70... as for angryman117, I believe that the HGI20 (HG1020?) is a the gear ratio code for 4.57 for the Eatons. Eaton Stamped the ratios in the housing itself.
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 01-29-2014, 02:26 PM   #65
jpyle
Registered User
 
Join Date: Jan 2014
Location: Midvale, Idaho
Posts: 6
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Jeremy I have a 1970 Chevy c30 Dually with a Eaton 72.Is the only difference is the length of the studs? Thanks Joe
jpyle is offline   Reply With Quote
Old 01-29-2014, 08:35 PM   #66
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,188
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Originally Posted by jpyle View Post
Jeremy I have a 1970 Chevy c30 Dually with a Eaton 72.Is the only difference is the length of the studs? Thanks Joe
Dually hubs are different than SRW. I don't have any pictures of the DRW hubs. They can be swapped over though.
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 01-31-2014, 09:41 AM   #67
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 472
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Hi, I have a question about swapping a 68 HO52 brake set up to a 14 bolt 13" brake setup. You mentioned the bearings ahve different diameter, but the backing plate of the 13" brakes will bolt up to the HO52 housing, correct?

Now my question is, sure you could turn down the spindles and run the 14 bolt hub and make it work that way, but I was wondering, would it be possible to just turn out the bearing race diameter in the 14 bolt hub to accept the HO52 bearings and then bolt that setup with the original HO52 bearings onto the spindle?
I doubt that you can just use the HO52 hub, put the 14 bolt drum on it and mount it up, as your picture shows the 13" drum is deeper, so therefore the hub would come out further too and the bearing seats wouldnŽt line up on the spindle anymore...or am I wrong? Is the backing plate of the 13" drums set in further, so that would actually work?

Could it be possible, I just take the 68 HO52 hubs, bore the stud holes out for the 9/16" studs, mount up the 13" drum and backing plate and bolt it all on the HO52???

Thanks!

Quote:
Originally Posted by jbclassix View Post
More Side-by-sides.



Check out the different welds on the 71(top) and 69(bottom) Eaton brackets!





14 bolt and Eaton threads are the same. This is the 14 bolt spindle nut on the Eaton


The 14 bolt bearings are smaller than the Eaton. They have a smaller ID and OD
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 02-02-2014, 12:38 PM   #68
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,188
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Originally Posted by K20chevy View Post
...Could it be possible, I just take the 68 HO52 hubs, bore the stud holes out for the 9/16" studs, mount up the 13" drum and backing plate and bolt it all on the HO52???
Absolutely!!! if you cant source 71+ hubs, that is a very cost effective route.
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 02-02-2014, 05:08 PM   #69
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 472
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Originally Posted by jbclassix View Post
Absolutely!!! if you cant source 71+ hubs, that is a very cost effective route.
COOL! So that way the bearings will stay in the same location and the 13" drum would still have the correct spacing to work with the backing plate?

That is awesome because I have a 8 lug D44 front that I could swap and have the 14 bolt with brakes as well. Therefore IŽll just mount the 14 bolt drums onto the HO52 hubs and be all set with a better braking system!

Thanks for the info!

I might try to find 71/72 hubs, if I canŽt I just bore out the 68 hubs...
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 02-04-2014, 01:40 PM   #70
whitedog76
Registered User
 
Join Date: Jan 2014
Location: Peoria, IL
Posts: 769
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I have a 14B FF that I'm planning on mounting under my 54 3600 truck. I gave up trying to find a 4.11 gearset for the HO52, so I bought a 14B. My 14 is from a SRW truck, which is 67" wide. I knew I needed the DRW hubs to make it work, so I bought a housing that had been gutted, but still had the hubs. My original plans were to keep the factory style drum brakes. I found some 5.2" deep drums that would work from a van.

Well, one day when I was at the junk-yard I spotted an Express 2500 van with rear discs. I figured, "This could work." So, a couple months later I saw a rearend from an 03 van up for sale, anyway I bought it. The rearend was a D60 semi-floater. It had all the necessarry hardware, but to my dismay, the flange was different front the 14b. I wasn't too worried, there's plenty of shops that can fabricate them.

The Hubs and rotors.

The rotors won't slip over the early hubs, meaning they need mounted from the back, just like the drums. See here- http://s1074.photobucket.com/user/wh...97856697396817
http://s1074.photobucket.com/user/wh...97856697396817

I didn't like this arrangement for two reasons, 1- it puts everything really far inboard. 2- the flange isn't in a good spot.

So, I got to thinking. Why not the Eaton hubs? The Eaton spindles shafts are about .060 larger than the 14B, meaning I'll need different bearings. The rotor slides over quite nice and provides plenty of clearance before I get into the old flange. With the rotors installed the rearend will have somewhere around a 65" WMS, which is acceptable for my application. I need to have a flange made and weld it on. I'll have to get larger studs or use the tapered centering bolts from the Eaton hubs.

http://s1074.photobucket.com/user/wh...47396257023324
http://s1074.photobucket.com/user/wh...47396257023324

What I din't know in the beginning is that the brackets are availible from GM and aren't that expensive. Plus it's alot easier than pulling parts from a junk yard rearend. You can get new backing plates, hardware, and shoes from your local parts store also.

http://s1074.photobucket.com/user/wh...47396257023324

http://s1074.photobucket.com/user/wh...47396257023324

Bearings

14B axle- HO52 hubs

Inner- 382 Race (same as oem HO52/72)

Inner 387, 387A, 387AS, or 387S Tapered roller bearing (Same as the 14B)

Outer 362 Race
Outer 368, 368A, 370A Tapererd roller bearing

FYI- you can use he same brackets to convert your early trucks with the Eaton to Discs also.
whitedog76 is offline   Reply With Quote
Old 02-18-2014, 01:51 AM   #71
RangerCB29
Registered User
 
Join Date: Apr 2010
Location: Baytown, TX
Posts: 22
Re: Eaton HO72/HO52 vs. 14 Bolt FF

well I don't know if mine is a 52 or 72, mine has a load bolt, 4.57 (if you do the math) so call it 4.56 if you want. it also has drums that resemble the 14bolt style, not the smooth drums that are normal for this axle. I never could find anything that showed the I.D. number I have on the top of the center section. also I do believe mine is an open carrier cuz I just see spider gears in there. I love these axles the more I read up on them. would LOVE one for the front !!! any help there ????
__________________
1971 gmc shortbed, in the middle of a frame up job, accuair e-level, 496 big block, full porterbuilt suspension, intro wheels...way too much work
1967 International Travelette 4x4...aka the coolest truck ive ever owned
1999 cummins ext cab swb 2wd, 200hp sticks, compound turbos. 5"exh. smarty/comp stack, My daily driver.
RangerCB29 is offline   Reply With Quote
Old 02-18-2014, 10:37 AM   #72
whitedog76
Registered User
 
Join Date: Jan 2014
Location: Peoria, IL
Posts: 769
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I've never seen anything that defininatively explains the difference between the HO52 and HO72. To the best of my knowledge, the HO52 has a 9.75 ring gear and the HO72 has an 11 inch.

With the "load bolt" I would lean towards it being a HO72, but who knows what changed throughout the years.

There are a number of kits out that that will convert a rear axle to fron axle use. The biggest problem I see is with the axle shafts. You'll need someone that can make a shaft with the Eaton spline pattern. I'm sure there's someone that can do it.

Here's some knuckles. Your tubes are 3 1/4" so the 3 1/8 are what you would need.

http://www.reidracing.biz/off-road-p...a-60-inner-c-1

http://www.reidracing.biz/off-road-p...ering-knuckles

14 bolt kit with lots of info.
http://www.cranehiclearance.com/crane_017.htm


I've heard of guys using Dana 50 knuckles from a Super Duty and fitting them to 14 bolts or D60s also.

Start choppin bro!
whitedog76 is offline   Reply With Quote
Old 02-18-2014, 03:37 PM   #73
RangerCB29
Registered User
 
Join Date: Apr 2010
Location: Baytown, TX
Posts: 22
Re: Eaton HO72/HO52 vs. 14 Bolt FF

Thanks for the reply man. I'm going to need a locker for sure though. Not spending all that cash on a open diff. Guys where not joking when they said the bearings ain't cheap!
__________________
1971 gmc shortbed, in the middle of a frame up job, accuair e-level, 496 big block, full porterbuilt suspension, intro wheels...way too much work
1967 International Travelette 4x4...aka the coolest truck ive ever owned
1999 cummins ext cab swb 2wd, 200hp sticks, compound turbos. 5"exh. smarty/comp stack, My daily driver.
RangerCB29 is offline   Reply With Quote
Old 02-18-2014, 03:45 PM   #74
PortalAxls
Registered User
 
PortalAxls's Avatar
 
Join Date: Dec 2011
Location: Coral Bay, St John USVI
Posts: 58
Re: Eaton HO72/HO52 vs. 14 Bolt FF

I want to say the difference between the 52 and the 72 is brake size. I don't think it got bigger gears until the 110 unit. I could be wrong though so don't take my word as gospel. You can use a 14 bolt detroit locker , but you will need to run the 14 bolt shafts cut down a little at the splined end.
__________________
67 GMC K2500. 305D V6, 4 spd, rotted wood bed, and lots of rust!!

WTB: Eaton HO 4:10 or 4:11 tapered beaing gearset, or complete 3rd of either style bearing in the 4:10 ratio
PortalAxls is offline   Reply With Quote
Old 02-18-2014, 06:36 PM   #75
whitedog76
Registered User
 
Join Date: Jan 2014
Location: Peoria, IL
Posts: 769
Re: Eaton HO72/HO52 vs. 14 Bolt FF

RANGER- I don't think anything with the Eatons are cheap. Considering they haven't built the axles since 72, probably not alot of demand.

You may be able to source some alternative bearings by going to Timken.com, but I doubt it.

Another alternative is a Ford 9" front steer axle. The off road guys have been doing it for years. It has the same basic look as the Eatons, you might be able to fool some folks.
whitedog76 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 11:29 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com