What Axle do I have? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ogier · 07-22-2004, 11:33 PM

Greetings all,

I am going to regear my rearend in my '69 chev C-20 and need to know what axle I have. It is the one with the center pumpkin that drops out the front when you remove the axleshafts.

I think it currently has a 5.13 gear ratio in it and I want to go with a 3.23ish gearing.

Thanks in advance.
Ogier

Ogier · 07-23-2004, 02:14 AM

*bump*

here are pictures of the front and back of the axle.

Ogier

texnician01 · 07-23-2004, 04:17 AM

looks like maybe an eaton to me but i'm not all that good on 3/4 tons.

**JIMs70GMC** · 07-23-2004, 05:52 AM

yep that's what's called the eaton/corperate axle also known as H052 (3/4) or H072 (1 ton) rear. It was replaced by the 14 bolt full float axle in 1973. The best(highest) gear ratio you'll find will be 4.10s. 3.90s were supposedly available from the aftermarket. Do a search on H052 or H072.

Ogier · 07-24-2004, 12:43 AM

Ok, Now that I have the axle positively identified as an Eaton. I would like to swap in a 12-14bolt 3/4T axle in it's place. What vehicles should I look for this under. I don't want to have to cut and weld on mounting hardware. I want a direct bolt in.

I believe that I will have to shorten the driveline a bit to do this swap and am prepared to do so.

Thanks again in advance,

Ogier

Pont · 07-24-2004, 01:37 AM

Ogier, just wanted to welcome you to the board from a neighbor. I'm in GP

Pont

Ogier · 07-24-2004, 10:35 AM

Thanks.

Ogier

Quote:

Originally Posted by Pont

Ogier, just wanted to welcome you to the board from a neighbor. I'm in GP

Pont

ChevLoRay · 07-24-2004, 02:18 PM

Whether or not you keep the rear that you have, here's some info from my '69 Truck Data book (dealer item). The stock gears for your truck should be 4.10's. That's the standard ratio with any engine except the 250 6-cyl. There's a 4.57 available, but only with the 250. Look for Option number H20 or HB8.

Ogier · 07-24-2004, 03:37 PM

I would like to get down to about 3.30ish I think. So, I believe that I need a 12-14bolt 3/4 tonne axle to do this rather than the eaton.

Thanks
Ogier

1969 GMC · 07-24-2004, 04:31 PM

5.14 were an option with the Eaton axle. IIRC, the 14 bolt can only go down to 3.73, but the dana 70 (similar to the Eaton and 14b) can go down to 3.07. Or, you could always swap in lighter axles, like the 12 bolt.

Ogier · 07-24-2004, 10:39 PM

A 12-bolt would probably be just fine. I don't abuse my rigs.

Ogier

07-22-2004, 11:33 PM	#1
Ogier Chopper/Painter Join Date: Jul 2004 Location: Medford, Or. Posts: 284	What Axle do I have? Greetings all, I am going to regear my rearend in my '69 chev C-20 and need to know what axle I have. It is the one with the center pumpkin that drops out the front when you remove the axleshafts. I think it currently has a 5.13 gear ratio in it and I want to go with a 3.23ish gearing. Thanks in advance. Ogier

07-23-2004, 04:17 AM	#3
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	looks like maybe an eaton to me but i'm not all that good on 3/4 tons. __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

07-23-2004, 05:52 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	yep that's what's called the eaton/corperate axle also known as H052 (3/4) or H072 (1 ton) rear. It was replaced by the 14 bolt full float axle in 1973. The best(highest) gear ratio you'll find will be 4.10s. 3.90s were supposedly available from the aftermarket. Do a search on H052 or 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

07-24-2004, 01:37 AM	#6
Pont I need another Barley Pop Join Date: Feb 2001 Location: Grants Pass, OR Posts: 1,629	Ogier, just wanted to welcome you to the board from a neighbor. I'm in GP Pont __________________ 67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"

07-24-2004, 02:18 PM	#8
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Whether or not you keep the rear that you have, here's some info from my '69 Truck Data book (dealer item). The stock gears for your truck should be 4.10's. That's the standard ratio with any engine except the 250 6-cyl. There's a 4.57 available, but only with the 250. Look for Option number H20 or HB8. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

07-23-2004, 02:14 AM	#2
Ogier Chopper/Painter Join Date: Jul 2004 Location: Medford, Or. Posts: 284	bump here are pictures of the front and back of the axle. Ogier

07-24-2004, 12:43 AM	#5
Ogier Chopper/Painter Join Date: Jul 2004 Location: Medford, Or. Posts: 284	Ok, Now that I have the axle positively identified as an Eaton. I would like to swap in a 12-14bolt 3/4T axle in it's place. What vehicles should I look for this under. I don't want to have to cut and weld on mounting hardware. I want a direct bolt in. I believe that I will have to shorten the driveline a bit to do this swap and am prepared to do so. Thanks again in advance, Ogier

07-24-2004, 03:37 PM	#9
Ogier Chopper/Painter Join Date: Jul 2004 Location: Medford, Or. Posts: 284	I would like to get down to about 3.30ish I think. So, I believe that I need a 12-14bolt 3/4 tonne axle to do this rather than the eaton. Thanks Ogier

07-24-2004, 04:31 PM	#10
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	5.14 were an option with the Eaton axle. IIRC, the 14 bolt can only go down to 3.73, but the dana 70 (similar to the Eaton and 14b) can go down to 3.07. Or, you could always swap in lighter axles, like the 12 bolt. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

07-24-2004, 10:39 PM	#11
Ogier Chopper/Painter Join Date: Jul 2004 Location: Medford, Or. Posts: 284	A 12-bolt would probably be just fine. I don't abuse my rigs. Ogier



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