HO 52/ 72 axle question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tx Firefighter · 10-30-2004, 07:53 AM

Will a 3/4 ton (HO52 I'm assuming) rear center section fit into a 1 ton (HO72 I assume) rear end?

Chris H · 10-30-2004, 09:22 AM

Yes, the center section will interchange either way.
The most desired have an adjustable pinion load bolt to prevent deflection under heavy loads, found in both ho52 and ho72 axles.
As you know, not many "good" ratios available:
4.10, 4.57, 5.14, and a 6.36 (?).
3.90 was/is available aftermarket.
Many came with a factory "no-spin", a Detroit Locker. Some of these have a pretty severe action on the street, but are fairly bulletproof.

**Stocker** · 10-30-2004, 09:33 AM

Quote:

Originally Posted by Chris H

As you know, not many "good" ratios available:
4.10, 4.57, 5.14, and a 6.36 (?).
3.90 was/is available aftermarket.

What the.... Those look like pretty good ratios to me!

Not economy ratios for sure, but those diffs are usually in trucks that are made to work a bit harder than average... And of course, you can run taller tires...

Tx Firefighter · 10-30-2004, 02:26 PM

I appreciate it fellows.

roger0080 · 10-30-2004, 03:16 PM

Then what is the real difference between the H052 and the HO72?
Is the axle housing a little bit bigger or longer?
Axle shafts a little bit bigger or longer?

**JIMs70GMC** · 10-30-2004, 06:43 PM

I think the only difference is the size of the brakes. H052 had 12" brakes and the H072 had 13" brakes. Although my 1970 chassis manual only talks about the pinion load bolt on the H072.

10-30-2004, 07:53 AM	#1
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	HO 52/ 72 axle question Will a 3/4 ton (HO52 I'm assuming) rear center section fit into a 1 ton (HO72 I assume) rear end? __________________ I'm on the Instagram- @Gearhead_Kevin

10-30-2004, 02:26 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	I appreciate it fellows. __________________ I'm on the Instagram- @Gearhead_Kevin

10-30-2004, 03:16 PM	#5
roger0080 Registered User Join Date: Nov 2000 Location: Carver County, Minnesota, USA Posts: 626	Then what is the real difference between the H052 and the HO72? Is the axle housing a little bit bigger or longer? Axle shafts a little bit bigger or longer? __________________ 72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71...

10-30-2004, 06:43 PM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I think the only difference is the size of the brakes. H052 had 12" brakes and the H072 had 13" brakes. Although my 1970 chassis manual only talks about the pinion load bolt on the H072. __________________ 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

10-30-2004, 09:22 AM	#2
Chris H 72 C30 Trailer Queen Join Date: Dec 1999 Location: SE MN, USA Posts: 794	Yes, the center section will interchange either way. The most desired have an adjustable pinion load bolt to prevent deflection under heavy loads, found in both ho52 and ho72 axles. As you know, not many "good" ratios available: 4.10, 4.57, 5.14, and a 6.36 (?). 3.90 was/is available aftermarket. Many came with a factory "no-spin", a Detroit Locker. Some of these have a pretty severe action on the street, but are fairly bulletproof.



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