rear end question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70GMC_BOB · 10-14-2004, 01:41 PM

I have a 1972 cheyenne super 3/4 ton. from what I have read I have either the ho72 or ho52 rear. it is howling and I am told to replace oit with a late model rear as the brakes I have now will bolt on. what year 14 bolt gm rear can I use???

Dean · 10-14-2004, 02:25 PM

I don't think the brakes are the same between your rearend and a 14 bolt.

Wouldn't it just be easier to swap out another center section? Pull the axles out just a bit, unbolt the driveshaft, unbolt the centersection and it is out. You won't even have to mess with the brakes that way. I'd think you should be able to find another used center section since they used them for years way before 1970. Do be carefull when dropping the center section out as it is very heavy.

70GMC_BOB · 10-14-2004, 03:42 PM

I agree that would be easier. the trick is I want to put in a detroit locker posi rear. does anyone have one around? Also is it the same center section if it is a ho52 or ho72?

Dean · 10-15-2004, 06:52 AM

It is the same center section. Detroit Lockers can be found around. Most of the time people or junkyards don't know what they have. Learn how to check them and don't forget to check the older trucks. My last two came out of 65-66 Chevy trucks.

TugOwar · 10-15-2004, 07:41 AM

So, if the whole center section is changed does that mean everything doesn't have to be re-aligned like it would if new ring and pinion were installed? I don't know much about rear ends thats why I'm asking.

Dean · 10-15-2004, 09:24 AM

That is correct. The ring and pinion set up would not be affected.

However, installing a locker out of one into anther is not a huge deal either. So even if you find a locker where the gear teeth are rusty or wrong gear ratio I would still get it.

TugOwar · 10-15-2004, 09:44 AM

Thats good to know Dean. I'd like to swap my 410 posi for something more hiway friendly, glad to know I can do it without worrying about ring/pinion setup.

Sorry Bob, didn't mean to hijack your thread.

Dean · 10-15-2004, 10:09 AM

I don't think you will find anything more highway friendly for that rearend. There were a few 3.90 ratio aftermarket ones, but rare. Sorry

70GMC_BOB · 10-15-2004, 01:05 PM

mine has a 10 bolt cover, 4.10 tag and on the axle housing has a "60" cast in it. can anyone post a pic of a ho52 to verify that is what I am dealing with. The cover is not perfectly round like I am told a ho72 is.

I forgot I didn't change the ujoints. that will happen saterday and hopefully stop all of the winning noise as i drive. the faster i go the louder it whines and man it is loud neadless to say i quit driving it around.

GMC71k20 · 10-15-2004, 01:17 PM

if your truck is a factory big block truck than it has a dana 60.

70GMC_BOB · 10-15-2004, 05:38 PM

Attached Is Info And A Sketch I Did Last Night Under The Truck.

70GMC_BOB · 10-15-2004, 05:43 PM

Is This A H052 Rear? Or A Dana 60?

TugOwar · 10-15-2004, 05:44 PM

Quote:

Originally Posted by Dean

I don't think you will find anything more highway friendly for that rearend. There were a few 3.90 ratio aftermarket ones, but rare. Sorry

Well Dean that just ain't good at all.

I'd like to keep the 8 lug and big drums, is there a different rear end with a higher ratio that I can just swap out?

Longhorn Man · 10-15-2004, 06:02 PM

the big blocks trucks came with a 3.54 didn't they? I'm pretty sure big block didn't mean automatily dgetting a dana either.
I think there was one for sale on the parts board maybe?
You would have the HO52 or dana, the HO72 is under one ton trucks only. They only came with leaf spring perches and yours is probably coil.
I'll see if I can find a pic of dana/eaton covers. Your drawinf makes me think dana.

TugOwar · 10-16-2004, 06:52 PM

Ttt

72C203503ONTHETREE · 10-17-2004, 12:24 AM

Just from the drawing its a Dana 60, the 52 is a perfectly round rear cover. I have a trailer with a full floater Dana 60 axle under it and looks exactly like what the drawing looks like. Lol, the rear itself is worth far more than what I paid for the trailer, $35.

70GMC_BOB · 10-18-2004, 12:54 PM

Ttt

70GMC_BOB · 10-18-2004, 12:56 PM

If Therear Is Determined The Problem After Ujoints I Have A Uncle Who Had A 72 3/4 That Was Wrecked And He Turned It Into A Trailer That Hasn't Moved For Years. I Could Be Lucky If He Wants Help Cleaning Out His Yard.

Also If It Is A Dana60 Is That A Stock 72 Rear And What Size Is It 10" 9.5"??

70GMC_BOB · 10-18-2004, 01:03 PM

ANOTHER CLUE AS TO WHAT YEAR /TYPE REAR END i HAVE. IT HAS THE OUTSIDE BOLTS OF A FLOATING AXLE, BUT WHEN i FIXED MY BRAKES THIS WEEKEND I PULLED THE WHEEL OFF AND THEN THE DRUM WITHOUT HAVING TO PULL THE AXLE LIKE MY DAD'S 70 1TON. IS THIS COMMON FOR A 3/4 TON?

**JIMs70GMC** · 10-30-2004, 06:56 PM

Yep on the dana 60 rears the drums come off without removing the hubs and axles. As far as I know the dana 60 w/ 3.54 gears backed the bigblock 3/4 ton 2wd trucks. The dana 60 has a 9.75" ring gear. The h052/H072 are a little under 10.5".

**Classic Heartbeat** · 10-30-2004, 07:06 PM

70GMC_BOB, You need to change your screen name to 72 SUPER BOB.... lol Your truck has a Dana 60 with 4:10 gears. I know this

, well because it used to be mine...lol Anyway, I have a Dana 60, 4:10 down here if you can find one up there. What happened to the one under the truck anyway? I replaced the brakes, and one of the drums on that rear end a couple of months befor I sold it to you. (So make sure to save the parts) WES www.ClassicHeartbeat.com

10-14-2004, 01:41 PM	#1
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	rear end question I have a 1972 cheyenne super 3/4 ton. from what I have read I have either the ho72 or ho52 rear. it is howling and I am told to replace oit with a late model rear as the brakes I have now will bolt on. what year 14 bolt gm rear can I use??? __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-14-2004, 03:42 PM	#3
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	I agree that would be easier. the trick is I want to put in a detroit locker posi rear. does anyone have one around? Also is it the same center section if it is a ho52 or ho72? __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-15-2004, 01:05 PM	#9
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	mine has a 10 bolt cover, 4.10 tag and on the axle housing has a "60" cast in it. can anyone post a pic of a ho52 to verify that is what I am dealing with. The cover is not perfectly round like I am told a ho72 is. I forgot I didn't change the ujoints. that will happen saterday and hopefully stop all of the winning noise as i drive. the faster i go the louder it whines and man it is loud neadless to say i quit driving it around. __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-15-2004, 05:38 PM	#11
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	Attached Is Info And A Sketch I Did Last Night Under The Truck. __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-15-2004, 05:43 PM	#12
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	Is This A H052 Rear? Or A Dana 60? Attached Images __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-14-2004, 02:25 PM	#2
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	I don't think the brakes are the same between your rearend and a 14 bolt. Wouldn't it just be easier to swap out another center section? Pull the axles out just a bit, unbolt the driveshaft, unbolt the centersection and it is out. You won't even have to mess with the brakes that way. I'd think you should be able to find another used center section since they used them for years way before 1970. Do be carefull when dropping the center section out as it is very heavy.

10-15-2004, 06:52 AM	#4
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	It is the same center section. Detroit Lockers can be found around. Most of the time people or junkyards don't know what they have. Learn how to check them and don't forget to check the older trucks. My last two came out of 65-66 Chevy trucks.

10-15-2004, 07:41 AM	#5
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	So, if the whole center section is changed does that mean everything doesn't have to be re-aligned like it would if new ring and pinion were installed? I don't know much about rear ends thats why I'm asking.

10-15-2004, 09:24 AM	#6
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	That is correct. The ring and pinion set up would not be affected. However, installing a locker out of one into anther is not a huge deal either. So even if you find a locker where the gear teeth are rusty or wrong gear ratio I would still get it.

10-15-2004, 09:44 AM	#7
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	Thats good to know Dean. I'd like to swap my 410 posi for something more hiway friendly, glad to know I can do it without worrying about ring/pinion setup. Sorry Bob, didn't mean to hijack your thread.

10-15-2004, 10:09 AM	#8
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	I don't think you will find anything more highway friendly for that rearend. There were a few 3.90 ratio aftermarket ones, but rare. Sorry

10-15-2004, 01:17 PM	#10
GMC71k20 Registered User Join Date: Aug 2002 Location: mass Posts: 1,277	if your truck is a factory big block truck than it has a dana 60.

10-15-2004, 06:02 PM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	the big blocks trucks came with a 3.54 didn't they? I'm pretty sure big block didn't mean automatily dgetting a dana either. I think there was one for sale on the parts board maybe? You would have the HO52 or dana, the HO72 is under one ton trucks only. They only came with leaf spring perches and yours is probably coil. I'll see if I can find a pic of dana/eaton covers. Your drawinf makes me think dana.

10-16-2004, 06:52 PM	#15
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	Ttt

10-17-2004, 12:24 AM	#16
72C203503ONTHETREE Registered User Join Date: Apr 2004 Location: Grant, Alabama Posts: 504	Just from the drawing its a Dana 60, the 52 is a perfectly round rear cover. I have a trailer with a full floater Dana 60 axle under it and looks exactly like what the drawing looks like. Lol, the rear itself is worth far more than what I paid for the trailer, $35. __________________ 72 Chevy C20, SOLD (Dang it.) 09 Challanger RT six speed in all black. 74 Datsun 710 wagon, all 1.8 liters of screaming Datsun power. 73 C10 long bed, 350/350 combo, nice shape.



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10-18-2004, 12:54 PM	#17
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	Ttt __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-18-2004, 12:56 PM	#18
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	If Therear Is Determined The Problem After Ujoints I Have A Uncle Who Had A 72 3/4 That Was Wrecked And He Turned It Into A Trailer That Hasn't Moved For Years. I Could Be Lucky If He Wants Help Cleaning Out His Yard. Also If It Is A Dana60 Is That A Stock 72 Rear And What Size Is It 10" 9.5"?? __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-18-2004, 01:03 PM	#19
70GMC_BOB Registered User Join Date: Jul 2001 Location: Lynnwood, washington Posts: 121	ANOTHER CLUE AS TO WHAT YEAR /TYPE REAR END i HAVE. IT HAS THE OUTSIDE BOLTS OF A FLOATING AXLE, BUT WHEN i FIXED MY BRAKES THIS WEEKEND I PULLED THE WHEEL OFF AND THEN THE DRUM WITHOUT HAVING TO PULL THE AXLE LIKE MY DAD'S 70 1TON. IS THIS COMMON FOR A 3/4 TON? __________________ 1972 chev c20 2wd lwb 350v8/th350. (dad's)1970 gmc longstep (9ft commercial bed), 1 ton, 2wd, 350/th400.

10-30-2004, 06:56 PM	#20
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Yep on the dana 60 rears the drums come off without removing the hubs and axles. As far as I know the dana 60 w/ 3.54 gears backed the bigblock 3/4 ton 2wd trucks. The dana 60 has a 9.75" ring gear. The h052/H072 are a little under 10.5". __________________ 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, 07:06 PM	#21
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	70GMC_BOB, You need to change your screen name to 72 SUPER BOB.... lol Your truck has a Dana 60 with 4:10 gears. I know this , well because it used to be mine...lol Anyway, I have a Dana 60, 4:10 down here if you can find one up there. What happened to the one under the truck anyway? I replaced the brakes, and one of the drums on that rear end a couple of months befor I sold it to you. (So make sure to save the parts) WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

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