Longhorn Rearend Eaton or GM...I need a real gasket!!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stllookn · 08-28-2005, 09:17 PM

Looks like an Eaton but I can't find it in my Chassis rebuild manual and the restoration manual is no help. 4.57 ratio however 7/32. I went to NAPA to get a new gasket and all they had was a very thin piece of paper that fit...said Dana on the package!!!!!! This does not look like a Dana casting or cover (round)! This thing had a cork gasket on it but I can't seem to find a replacement cork gasket. Thought I would ID the rearend first.

Americanrider · 08-28-2005, 10:30 PM

Yea, it's a Eaton... clean it good & just use Blue RTV.

stllookn · 08-28-2005, 10:35 PM

Boone, Thanks. I am trying to do the 100 pt resto on this one so I think I am going to have to make a cork gasket. I hate being this picky! The good news is that it looks great and tight inside...WHOOO HOOOO!

Longhorn Man · 08-28-2005, 10:35 PM

Just use sealant. I like The Right Stuff. Expensive, but it works. (and the OEM's all aprove it too)

**oldiron** · 08-28-2005, 10:56 PM

Try Randy's Ring and Pinion. Use their 800 # ext. 5552 Tell Opie I told you to call. He is real good to work with.

stllookn · 08-28-2005, 11:48 PM

Thanks guys...good suggestions. I will follow up. I was hoping to button it up today but it is raining for the first time in months so I guess we work in the garage tonight.

Longhorn Man · 08-29-2005, 12:01 AM

it's raining in washington??? no way!

4x4Poet · 08-29-2005, 02:54 AM

I recently bought a thick, round, paper gasket from NAPA for my '72 K20 pickup's Eaton rear cover. Still in the package. I could pull the part number tomorrow, if needed.

BTW, NAPA also sells the paper gasket that goes between the Eaton's third member and its axle housing. That, also round, gasket is thin paper– probably to keep the side gears properly aligned with the centerline of the inserted axles once the third member is torqued down.

stllookn · 08-29-2005, 02:58 AM

The one the guy tried to sell me...and I refused to buy was that thin paper gasket! What a joke...I could have traced it on paper myself. I seriously thought it was the paper that was on the cork and someone just pulled the cork gasket out and left the paper inside.

Yes...I would like that part number if you have it.

Chris H · 08-29-2005, 10:48 AM

I have swapped a few Eaton 3rd members around, and I believe that these used a "paper" gasket from the factory.
I have used Permatex Ultra Black with good results, but it does not look absolutely original.
Do remember to use some kind of thread sealant on all the bolts, they go through the housing into the oil and will be quite messy in short order if not sealed. Dont ask me how I know this

stllookn · 08-29-2005, 11:10 AM

ChrisH, Good point. I pulled those bolts and watched the oil drain so I know what you mean. I will have to clean out the bottom of the housing before anything will seal those threads. The good thing is this baby is tight and looking good. I love when the PO takes care of the equipment. Some guys just never change the rear end oil!

Dean · 08-29-2005, 12:09 PM

I think GM did use the thin gasket. All I have ever seen when I pull them apart plus I ordered the gasket from GM and I got the thin one.

4x4Poet · 08-30-2005, 05:06 AM

Turns out I bought an Eaton H052 rear axle housing cover gasket from BTB:

Felpro RDS 5088 Rear axle housing set
Chevrolet Truck
1937-1972
Replaces 3665606

I have my '72 pickup's Eaton H052 rear cover off, so I lined up the gasket. Fits perfect. All precut holes line up. And I thought the gasket was paper, but it is ~1/16" and both thick and rubbery, like it is rubber impregnated paper. Definitely not cork. Not just smooth rubber. It has a texture. I'm not sure what it's made of, frankly.

D.PASS, Some H052s can have the ring gear deflection bolt in the side of the third member housing. I have a '71 K20 burb with 12"x2" brakes and a '72 K20 pickup with 11"x2.5" brakes and they both have third members with the side bolt adjustment. I'm guessing the deflection bolt came on later model H052s. I'm still learning about Eatons.

zimmm · 08-30-2005, 04:58 PM

NAPA/Victor Part No. for the rear gasket is P39130. This will be the heavier gasket material, but not cork. Just went through the same thing with my truck as well. For the 4x4's the catalog has the front and rear gasket parts numbers reversed.

stllookn · 08-30-2005, 05:08 PM

Looks like my adjustment bolt is on the side. Does that mean it is an HO52 or HO72?

1969 GMC · 08-30-2005, 06:23 PM

Quote:

Originally Posted by stllookn

Looks like my adjustment bolt is on the side. Does that mean it is an HO52 or HO72?

Your truck is a 3/4 ton, right? So its a H052. H072 was basically the same axle that came under one tons.

EDIT: the gear deflection bolt may be a newer thing. my '66 centersection doesnt have it, but my '68 does.

stllookn · 08-30-2005, 07:34 PM

1969GMC, Thanks, that is good to know...3/4 t. - Eaton HO52. I noticed that my '72 3/4 t. Longhorn has a Dana. I guess the General used whatever arrived on the next pallet...LOL!

4x4Poet · 08-30-2005, 11:19 PM

Quote:

Originally Posted by zimmm

NAPA/Victor Part No. for the rear gasket is P39130. This will be the heavier gasket material, but not cork. Just went through the same thing with my truck as well. For the 4x4's the catalog has the front and rear gasket parts numbers reversed.

I have NAPA P39130 Eaton H052 cover gasket in my hands and it is only ~1/32" thick. Compared to the Felpro RDS 5088 gasket I'm holding, the NAPA/Victor Reinz P39130 gasket is only half as thick as the Felpro gasket, so I'd say the thicker Felpro version will more easily conform to irregularities in the cover/housing or different bolt torques and thereby seal better. They're made of the same stuff, though [rubber impregnated paper? Still don't know.

].

I also have NAPA and Felpro Eaton H052 3rd member gaskets. NAPA P29129 and Felpro RDS 5090. They're about the same. Both thin paper, but the Felpro seems a tad better. Tough call.

I'm taking back both NAPA gaskets. NAPA's cover gasket for being half as thick as Felpro's offering and also NAPA's 3rd member gasket since I'll only have to make one return. Besides, I've already opened the Felpro boxes, but not the NAPA plastic wrap.

Thanks for the thread, stllookn. I might not have noticed the differences had you not brought it up while I had all 4 gaskets in hand with my H052 cover off. Felpro kicks @$$ this time. Now where's that receipt?

Robert1970C20rstbukt · 08-30-2005, 05:14 PM

The rear end in my truck has the load adjusting bolt on the side too.

Robert1970C20rstbukt · 08-30-2005, 11:32 PM

I had to buy a big sheet of cork/rubber gasket material and make one. All I could find were the thin paper ones too, but then I screwed up and didn't put sealer on the bolts so it leaks like a SOB. I'll just wait to fix it right when I change the gear oil again.

jostrans68 · 08-30-2005, 11:56 PM

like this?fel pro rds5088 at schucks

stllookn · 08-31-2005, 01:02 AM

jos....that looks like it. How thick is that bad boy? 4x4...thanks for the tip!

4x4Poet · 08-31-2005, 12:11 AM

BTW, a few posters mentioned sealing the bolts. I think Edelbrock's Gasgacinch works great for sealing the bolts and as a gasket sealer. Other sealers work well or even better to seal gaskets, but Gasgacinch seal perfectly fine, allows one to reposition the gasket when aligning it, and it removes easily for future cover removals. Little or no scraping of residue. Peals away most times and balls up easy. Good for intake gaskets, too.

4x4Poet · 09-01-2005, 04:11 AM

When I took the NAPA/Victor Reinz gaskets back today, the NAPA parts guy said that they have a Tuff Cork version of the cover gasket. All you have to do is add "TC" to the end of the part number to get the cork version. Might be worth a comparison, but I think Felpro's rubberized? gasket would be better than cork. Just a guess, at this point. I didn't want to trouble the parts guy just to make a comparison when I was satisfied with Felpro's cover gasket.

Man, who knew so much could be said about a couple gaskets?

I hope I don't talk too much.

stllookn · 09-01-2005, 10:16 AM

4x4...it's the little things that make for a perfect 100 pt. restoration. Unfortunately...here I am going a little overboard on some things. My son told me I was going to have to clear coat the DP90 so I just used some old gloss black engine paint for the the diffy cover. Now I am thinking maybe I should have the entire rearend powder coated...LOL!

BTW...I went with the P39130...looks fine. If I find something different in the assembly or rebuild manual, I will go back for the cork.

08-28-2005, 09:17 PM	#1
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Longhorn Rearend Eaton or GM...I need a real gasket!!!!! Looks like an Eaton but I can't find it in my Chassis rebuild manual and the restoration manual is no help. 4.57 ratio however 7/32. I went to NAPA to get a new gasket and all they had was a very thin piece of paper that fit...said Dana on the package!!!!!! This does not look like a Dana casting or cover (round)! This thing had a cork gasket on it but I can't seem to find a replacement cork gasket. Thought I would ID the rearend first. Attached Images __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) Last edited by stllookn; 08-28-2005 at 10:18 PM.

08-28-2005, 10:35 PM	#3
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Boone, Thanks. I am trying to do the 100 pt resto on this one so I think I am going to have to make a cork gasket. I hate being this picky! The good news is that it looks great and tight inside...WHOOO HOOOO! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

08-28-2005, 11:48 PM	#6
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Thanks guys...good suggestions. I will follow up. I was hoping to button it up today but it is raining for the first time in months so I guess we work in the garage tonight. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

08-29-2005, 02:54 AM	#8
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	I recently bought a thick, round, paper gasket from NAPA for my '72 K20 pickup's Eaton rear cover. Still in the package. I could pull the part number tomorrow, if needed. BTW, NAPA also sells the paper gasket that goes between the Eaton's third member and its axle housing. That, also round, gasket is thin paper– probably to keep the side gears properly aligned with the centerline of the inserted axles once the third member is torqued down. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 08-29-2005 at 02:55 AM.

08-29-2005, 02:58 AM	#9
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	The one the guy tried to sell me...and I refused to buy was that thin paper gasket! What a joke...I could have traced it on paper myself. I seriously thought it was the paper that was on the cork and someone just pulled the cork gasket out and left the paper inside. Yes...I would like that part number if you have it. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

08-28-2005, 10:30 PM	#2
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Yea, it's a Eaton... clean it good & just use Blue RTV.

08-28-2005, 10:35 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Just use sealant. I like The Right Stuff. Expensive, but it works. (and the OEM's all aprove it too)

08-28-2005, 10:56 PM	#5
oldiron Designated Grumpy Old Man Join Date: Oct 2001 Location: arlington, washington usa Posts: 3,094	Try Randy's Ring and Pinion. Use their 800 # ext. 5552 Tell Opie I told you to call. He is real good to work with.

08-29-2005, 12:01 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	it's raining in washington??? no way!

08-29-2005, 10:48 AM	#10
Chris H 72 C30 Trailer Queen Join Date: Dec 1999 Location: SE MN, USA Posts: 794	I have swapped a few Eaton 3rd members around, and I believe that these used a "paper" gasket from the factory. I have used Permatex Ultra Black with good results, but it does not look absolutely original. Do remember to use some kind of thread sealant on all the bolts, they go through the housing into the oil and will be quite messy in short order if not sealed. Dont ask me how I know this __________________ Chris H 72 C30 133" 72 C30 157" flat-dump 69 C10 short fleet 71 ElCamino 2000 K2500 crewcab shortbed (sold, sorry old friend) 2005 GMC 2500HD shortcrew Duramax 2006 K1500 RCSB and a couple other projects/parts

08-29-2005, 11:10 AM	#11
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	ChrisH, Good point. I pulled those bolts and watched the oil drain so I know what you mean. I will have to clean out the bottom of the housing before anything will seal those threads. The good thing is this baby is tight and looking good. I love when the PO takes care of the equipment. Some guys just never change the rear end oil! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

08-29-2005, 12:09 PM	#12
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	I think GM did use the thin gasket. All I have ever seen when I pull them apart plus I ordered the gasket from GM and I got the thin one.

08-30-2005, 05:06 AM	#13
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Turns out I bought an Eaton H052 rear axle housing cover gasket from BTB: Felpro RDS 5088 Rear axle housing set Chevrolet Truck 1937-1972 Replaces 3665606 I have my '72 pickup's Eaton H052 rear cover off, so I lined up the gasket. Fits perfect. All precut holes line up. And I thought the gasket was paper, but it is ~1/16" and both thick and rubbery, like it is rubber impregnated paper. Definitely not cork. Not just smooth rubber. It has a texture. I'm not sure what it's made of, frankly. D.PASS, Some H052s can have the ring gear deflection bolt in the side of the third member housing. I have a '71 K20 burb with 12"x2" brakes and a '72 K20 pickup with 11"x2.5" brakes and they both have third members with the side bolt adjustment. I'm guessing the deflection bolt came on later model H052s. I'm still learning about Eatons. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

08-30-2005, 04:58 PM	#14
zimmm Registered User Join Date: Aug 2005 Location: Pittsfield, PA Posts: 34	NAPA/Victor Part No. for the rear gasket is P39130. This will be the heavier gasket material, but not cork. Just went through the same thing with my truck as well. For the 4x4's the catalog has the front and rear gasket parts numbers reversed. __________________ 72 K20 - quote upon getting it home "What did you buy it for if the brakes don't work" 98 Z71, 96 Tacoma + more toys than I can remember

08-30-2005, 05:08 PM	#15
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Looks like my adjustment bolt is on the side. Does that mean it is an HO52 or HO72? Attached Images __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)



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08-30-2005, 07:34 PM	#17
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	1969GMC, Thanks, that is good to know...3/4 t. - Eaton HO52. I noticed that my '72 3/4 t. Longhorn has a Dana. I guess the General used whatever arrived on the next pallet...LOL! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

08-30-2005, 05:14 PM	#19
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	The rear end in my truck has the load adjusting bolt on the side too. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

08-30-2005, 11:32 PM	#20
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	I had to buy a big sheet of cork/rubber gasket material and make one. All I could find were the thin paper ones too, but then I screwed up and didn't put sealer on the bolts so it leaks like a SOB. I'll just wait to fix it right when I change the gear oil again. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

08-30-2005, 11:56 PM	#21
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	like this?fel pro rds5088 at schucks Attached Images __________________ [CGTW Member former 67-72 now with a 96 silverado Last edited by jostrans68; 08-30-2005 at 11:56 PM.

08-31-2005, 01:02 AM	#22
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	jos....that looks like it. How thick is that bad boy? 4x4...thanks for the tip! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) Last edited by stllookn; 08-31-2005 at 01:03 AM.

08-31-2005, 12:11 AM	#23
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	BTW, a few posters mentioned sealing the bolts. I think Edelbrock's Gasgacinch works great for sealing the bolts and as a gasket sealer. Other sealers work well or even better to seal gaskets, but Gasgacinch seal perfectly fine, allows one to reposition the gasket when aligning it, and it removes easily for future cover removals. Little or no scraping of residue. Peals away most times and balls up easy. Good for intake gaskets, too. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

09-01-2005, 04:11 AM	#24
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	When I took the NAPA/Victor Reinz gaskets back today, the NAPA parts guy said that they have a Tuff Cork version of the cover gasket. All you have to do is add "TC" to the end of the part number to get the cork version. Might be worth a comparison, but I think Felpro's rubberized? gasket would be better than cork. Just a guess, at this point. I didn't want to trouble the parts guy just to make a comparison when I was satisfied with Felpro's cover gasket. Man, who knew so much could be said about a couple gaskets? I hope I don't talk too much. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

09-01-2005, 10:16 AM	#25
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	4x4...it's the little things that make for a perfect 100 pt. restoration. Unfortunately...here I am going a little overboard on some things. My son told me I was going to have to clear coat the DP90 so I just used some old gloss black engine paint for the the diffy cover. Now I am thinking maybe I should have the entire rearend powder coated...LOL! BTW...I went with the P39130...looks fine. If I find something different in the assembly or rebuild manual, I will go back for the cork. Attached Images __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

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