Rear end I.D. ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**too much stuff** · 09-25-2010, 03:59 PM

Parting a cheyenne 20 longhorn and just wanted to make sure this was or wasn't worth grabbing. Any info is appreciated. I assume it is non posi? (i don't mess with many 3/4 tons)Thanks, Eric

Shaky · 09-25-2010, 04:43 PM

That's an HO52. It's commonly referred to as an "Eaton" however I believe it is an Eaton-type rear that was manufactured by GM.

They're good rears from what I can tell by reading. Some 4-wheelers still use them.

The most "highway" ratio that was available was 4.10 (although there's reports of custom made 3.90s around at one time) so that limits their appeal to a lot of people.

They were available with posi ("No-spin") and those are desirable. I don't know how to tell the posi by looking at it.

I have one in my C20 and I'm sticking with it...

raycow · 09-25-2010, 08:17 PM

I like these rears. They are strong, last almost forever, and IMO are easier to work on than the 14 bolt which replaced them. Their only real disadvantage is the 4.10 gearing, but if you have an overdrive transmission there is no good reason not to use one.

Ray

**too much stuff** · 09-26-2010, 12:22 PM

Any way to tell if this is a posi from these pics? I can't turn the rear over...

FRENCHBLUE72 · 09-26-2010, 01:48 PM

Does not look like a posi to me and you would have to pull the carrier out and split it to actually see inside of it(however it has been awhile since I messed with one).. They are strong rear ends but seem to be a p.i.t.a. to find brake parts for.

raycow · 09-26-2010, 02:13 PM

Quote:

Originally Posted by too much stuff

Any way to tell if this is a posi from these pics? I can't turn the rear over...

Yours looks like the ones I have worked on that didn't have posi, but I have never had one with posi to compare it with.

To find out for sure, you will need to lift one wheel off the ground. Make sure that the parking brake is off, if it has one, and that the driveshaft is either disconnected or free to turn.

If the wheel will turn by hand, you have an open rear. Even if you can't turn it, there should still be some free play in the wheel. If yours won't move at all, the brake shoes may be frozen to the drum. The only way to find out then would be to get the drum off.

Ray

**too much stuff** · 09-26-2010, 02:37 PM

Quote:

Originally Posted by raycow

Yours looks like the ones I have worked on that didn't have posi, but I have never had one with posi to compare it with.

To find out for sure, you will need to lift one wheel off the ground. Make sure that the parking brake is off, if it has one, and that the driveshaft is either disconnected or free to turn.

If the wheel will turn by hand, you have an open rear. Even if you can't turn it, there should still be some free play in the wheel. If yours won't move at all, the brake shoes may be frozen to the drum. The only way to find out then would be to get the drum off.

Ray

The rear won't turn at all. Been sitting for 25 years with no rear wheels. The brake drums are REALLY stuck. Thanks for the help. Eric

CE20934 · 09-26-2010, 03:01 PM

That oil looks like mud. Ick.

It looks like an open diff to me. In the last picture, there's a window in the carrier just below the ring gear. It looks like there are spider gear teeth in that window. If so, it's definitely an open diff. If the window has shiny steel in it, it's a Detroit No-Spin (aka Detroit Locker).

FWIW, they never put a posi in these rear ends; only a locker.

09-25-2010, 03:59 PM	#1
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,790	Rear end I.D. ?? Parting a cheyenne 20 longhorn and just wanted to make sure this was or wasn't worth grabbing. Any info is appreciated. I assume it is non posi? (i don't mess with many 3/4 tons)Thanks, Eric Attached Images __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

09-25-2010, 04:43 PM	#2
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: Rear end I.D. ?? That's an HO52. It's commonly referred to as an "Eaton" however I believe it is an Eaton-type rear that was manufactured by GM. They're good rears from what I can tell by reading. Some 4-wheelers still use them. The most "highway" ratio that was available was 4.10 (although there's reports of custom made 3.90s around at one time) so that limits their appeal to a lot of people. They were available with posi ("No-spin") and those are desirable. I don't know how to tell the posi by looking at it. I have one in my C20 and I'm sticking with it... __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce Last edited by Shaky; 09-25-2010 at 04:44 PM.

09-25-2010, 08:17 PM	#3
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Rear end I.D. ?? I like these rears. They are strong, last almost forever, and IMO are easier to work on than the 14 bolt which replaced them. Their only real disadvantage is the 4.10 gearing, but if you have an overdrive transmission there is no good reason not to use one. Ray Last edited by raycow; 09-25-2010 at 08:23 PM.

09-26-2010, 12:22 PM	#4
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,790	Re: Rear end I.D. ?? Any way to tell if this is a posi from these pics? I can't turn the rear over... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

09-26-2010, 01:48 PM	#5
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Re: Rear end I.D. ?? Does not look like a posi to me and you would have to pull the carrier out and split it to actually see inside of it(however it has been awhile since I messed with one).. They are strong rear ends but seem to be a p.i.t.a. to find brake parts for. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

09-26-2010, 03:01 PM	#8
CE20934 Senior Member Join Date: Apr 2002 Location: Help! I'm in an office park with its own network of freeways! Posts: 470	Re: Rear end I.D. ?? That oil looks like mud. Ick. It looks like an open diff to me. In the last picture, there's a window in the carrier just below the ring gear. It looks like there are spider gear teeth in that window. If so, it's definitely an open diff. If the window has shiny steel in it, it's a Detroit No-Spin (aka Detroit Locker). FWIW, they never put a posi in these rear ends; only a locker. __________________ '67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. fingers crossed Last edited by CE20934; 09-26-2010 at 03:01 PM.



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