Axle Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

yfs200p · 05-23-2004, 05:48 PM

What is the difference between a corporate axle and a regular axle? I hear alot of talk about "corporate" axles and have no idea what it means. also how would i know if i had one of these so-called "corporate" axles? THANKS

1969 GMC · 05-23-2004, 06:54 PM

corporate axles are usually axles made by GM, for example the 10-,12-, and 14-bolt axles are all corporate units.

CEDJUNIOR · 05-23-2004, 07:10 PM

GM used to use axles made by Eaton and by Dana and such, so the axles were from an outside source. Then GM started making their own axles, the 10 bolt, 12 bolt, and 2 versions of the 14 bolt. They were made by GM so they also got the name Corporate.

**JIMs70GMC** · 05-23-2004, 07:18 PM

The ones made by Eaton are also refered to as corperate axles, these axles refered to by their RPO code (H052 and H072) are what was available before the legendary GM 14 bolt axle. What you have to watch for is the dana 44 has 10 bolts like the GM 10 bolt axle.

DennyB · 05-23-2004, 10:18 PM

This is a good link to help ID your differential housing.

http://www.g-body.org/tnt/diffs/diff-housings.php

Budweis · 05-24-2004, 12:13 AM

i noticed the eatons not on that list. the eaton looks like pic attached.

DennyB · 05-26-2004, 12:11 PM

Thats right Bud!
Just to help the Corporate/eatons Had a round 10 bolt rear cover and a drop out nodular front center section (like the 9" fords).
I believe it had a 9-1/2" ring gear.

Denny

**JIMs70GMC** · 05-26-2004, 01:37 PM

Make that 10.5". The axle shafts were a hair over 1.5" but had only 17 splines. As comparision the 14 bolt FF and dana 70 are also around 10.5" and have 1.5" axle shafts but more splines.

DennyB · 06-02-2004, 07:15 AM

Quote:

Originally Posted by JIMs70GMC

Make that 10.5". The axle shafts were a hair over 1.5" but had only 17 splines. As comparision the 14 bolt FF and dana 70 are also around 10.5" and have 1.5" axle shafts but more splines.

This is ponderous..
There are Eaton 9 1/2" out there but now I am unclear as to which is a 9 1/2 and which is a 10 1/2.
So far what I come up with is that the FF axles are 10 1/2 and the Semi floaters are 9 1/2 rings with the early 10 bolt cover (14 bolt ring gear) axles.

I had two of these rears, both FF. one locker and one open. Now I wished I opened them up.

But now I'm not completely sure

http://www.akfabshop.com/alaskaoffroad/axle_tech.htm

http://www.kldriveline.com/gmdiff9.5.htm

**JIMs70GMC** · 06-02-2004, 08:25 AM

Your right but those are 73 and later axles identified as "14 bolt" axles. The "eaton/corperate" axle w/ round cover and drop out center were only FF and 10.5" ring gear. There were higher GVWR axles similar to the eaton/corperate or H052/H072 that had larger ring gears these were 11000 and I believe 14000 lb axles.

1969 GMC · 06-02-2004, 12:44 PM

Jim, they did in fact make other sizes of eaton axles...pre 67, 1/2 ton trucks had an axle that looked like the HO52 but was semifloat with 6 lugs. I am not sure of the ring gear size of this axle. They also made a bigger version in some 1 ton trucks called the H135 or something like that, it didnt have a removable diff cover and had a 12.25" ring gear. there were also many other sizes that were available in larger trucks.

but for 67-72 3/4 and 1 ton, only the HO52 and HO72, full floaters with 10.5" ring gear. I think the names have something to do with weight capacity, at 5200# and 7200#, but could be wrong.

05-23-2004, 05:48 PM	#1
yfs200p E.H.F.D Engine #2 Join Date: Feb 2003 Location: East Hampton, NY Long Island Posts: 916	Axle Question What is the difference between a corporate axle and a regular axle? I hear alot of talk about "corporate" axles and have no idea what it means. also how would i know if i had one of these so-called "corporate" axles? THANKS __________________ -NICK '72 K10 SWB Fleetside. Avocado Highlander 350-4speed-NP205 Frame Off Re-Creation '89 GMC V3500 C/C Flatbed Plow Truck 454/SM465/Np205 '15 Chevy 2500HD CCSB High Country Duramax '22 Tahoe Premier Duramax

05-23-2004, 06:54 PM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	corporate axles are usually axles made by GM, for example the 10-,12-, and 14-bolt axles are all corporate units. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

05-23-2004, 07:10 PM	#3
CEDJUNIOR Registered User Join Date: Mar 2003 Location: Irving/Valley Ranch, Tx Posts: 897	GM used to use axles made by Eaton and by Dana and such, so the axles were from an outside source. Then GM started making their own axles, the 10 bolt, 12 bolt, and 2 versions of the 14 bolt. They were made by GM so they also got the name Corporate. __________________ GM RPO Codes '95 K1500 4x4 Ext Cab 5.7 TBI NV4500 Tranny, 14 Bolt swapped in, locker, 3.73's

05-23-2004, 07:18 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The ones made by Eaton are also refered to as corperate axles, these axles refered to by their RPO code (H052 and H072) are what was available before the legendary GM 14 bolt axle. What you have to watch for is the dana 44 has 10 bolts like the GM 10 bolt axle. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

05-23-2004, 10:18 PM	#5
DennyB Led Sled! Discs R 4 ME! Join Date: Jan 2001 Location: Toms River, NJ, USA (Transplanted Hoosier) Posts: 7,327	This is a good link to help ID your differential housing. http://www.g-body.org/tnt/diffs/diff-housings.php __________________ "Never ride faster than your Angel can fly" I.M.O.M,W,J&C Patriot Guard Rider

05-24-2004, 12:13 AM	#6
Budweis Geared for Collision Join Date: Jan 2004 Location: St. Louis, Mo. Posts: 683	i noticed the eatons not on that list. the eaton looks like pic attached. Attached Images __________________ MEMBER OF THE 4 WHEEL DISK BRAKE CLUB 1970 C/K20 3/4 Ton 1996 Collectors Edition Corvette 1977 Corvette Coupe

05-26-2004, 12:11 PM	#7
DennyB Led Sled! Discs R 4 ME! Join Date: Jan 2001 Location: Toms River, NJ, USA (Transplanted Hoosier) Posts: 7,327	Thats right Bud! Just to help the Corporate/eatons Had a round 10 bolt rear cover and a drop out nodular front center section (like the 9" fords). I believe it had a 9-1/2" ring gear. Denny

05-26-2004, 01:37 PM	#8
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Make that 10.5". The axle shafts were a hair over 1.5" but had only 17 splines. As comparision the 14 bolt FF and dana 70 are also around 10.5" and have 1.5" axle shafts but more splines. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-02-2004, 08:25 AM	#10
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Your right but those are 73 and later axles identified as "14 bolt" axles. The "eaton/corperate" axle w/ round cover and drop out center were only FF and 10.5" ring gear. There were higher GVWR axles similar to the eaton/corperate or H052/H072 that had larger ring gears these were 11000 and I believe 14000 lb axles. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-02-2004, 12:44 PM	#11
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Jim, they did in fact make other sizes of eaton axles...pre 67, 1/2 ton trucks had an axle that looked like the HO52 but was semifloat with 6 lugs. I am not sure of the ring gear size of this axle. They also made a bigger version in some 1 ton trucks called the H135 or something like that, it didnt have a removable diff cover and had a 12.25" ring gear. there were also many other sizes that were available in larger trucks. but for 67-72 3/4 and 1 ton, only the HO52 and HO72, full floaters with 10.5" ring gear. I think the names have something to do with weight capacity, at 5200# and 7200#, but could be wrong. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650



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