How big is the ring gear on an HO52/HO72? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Patrick Sullivan · 06-23-2002, 11:42 PM

Just wondering.. I can't find any info on them at all.

ckhd · 06-23-2002, 11:50 PM

It's been a long time since I called Randy's Ring & Pinion, but they were the only r&p guys that even knew what I was talking about. I can't remember for sure, but they either told me it was a 12¼" or 11¾". Pretty sure they said 12¼".

jostrans68 · 06-24-2002, 01:39 AM

I will try to measure in the next few days i have a 3.90 gear set setting here to go in mine

*Fast68Chevy* · 06-24-2002, 02:24 AM

http://www.drivetrainspecialists.com/setupspec.htm

http://www.favorites.com/~jolly/Jolly2500.htm

http://www.dynatrac.com/gm_rear.html

Duallie · 06-24-2002, 02:57 AM

I just eyeballed several of mine, and they're all a hair under 10.5".
Ever since that 4WD magazine incorrectly stated that an Eaton was 12.25", everyone has been using their wrong quoted number.
It feels good to get that off my chest.

ckhd · 06-28-2002, 09:42 PM

Funny thing. After this thread, I was browsing my '72 Chassis Overhaul Manual. It has the ring gear dimensions in it.

Duallie is absolutely right. The H-072/H-052 do not have a 12¼" ring gear. They have a 10 1/8" ring gear. The H-110 (1-ton axle) has the 12¼" ring gear.

06-23-2002, 11:42 PM	#1
Patrick Sullivan Transcendental Trucker Join Date: Dec 2001 Location: Rockaway Beach, OR Posts: 374	How big is the ring gear on an HO52/HO72? Just wondering.. I can't find any info on them at all. __________________ Patrick Sullivan \| sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all!

06-23-2002, 11:50 PM	#2
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	It's been a long time since I called Randy's Ring & Pinion, but they were the only r&p guys that even knew what I was talking about. I can't remember for sure, but they either told me it was a 12¼" or 11¾". Pretty sure they said 12¼". __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

06-24-2002, 01:39 AM	#3
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	I will try to measure in the next few days i have a 3.90 gear set setting here to go in mine __________________ [CGTW Member former 67-72 now with a 96 silverado

06-24-2002, 02:57 AM	#5
Duallie Registered User Join Date: Feb 2001 Location: Nikiski, Alaska Posts: 477	I just eyeballed several of mine, and they're all a hair under 10.5". Ever since that 4WD magazine incorrectly stated that an Eaton was 12.25", everyone has been using their wrong quoted number. It feels good to get that off my chest. __________________ Just as if I knew what I was doin'

06-28-2002, 09:42 PM	#6
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	Funny thing. After this thread, I was browsing my '72 Chassis Overhaul Manual. It has the ring gear dimensions in it. Duallie is absolutely right. The H-072/H-052 do not have a 12¼" ring gear. They have a 10 1/8" ring gear. The H-110 (1-ton axle) has the 12¼" ring gear. __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

06-24-2002, 02:24 AM	#4
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	http://www.drivetrainspecialists.com/setupspec.htm http://www.favorites.com/~jolly/Jolly2500.htm http://www.dynatrac.com/gm_rear.html



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