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 10Likes
09-03-2020, 11:39 AM
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CC Member
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Join Date: Jan 2005
Location: Orange,
CT
Cobra Make, Engine: ERA #720
Posts: 117
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Not Ranked
Differential housing gasket?
I'm going to change the fluid in my differential but I thought while it was empty it would be a good time to peek in there. Does anyone know what the part number is and/or where can I get a new gasket? I have the inboard rear brake set-up.
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09-03-2020, 11:47 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by rads42
I'm going to change the fluid in my differential but I thought while it was empty it would be a good time to peek in there. Does anyone know what the part number is and/or where can I get a new gasket? I have the inboard rear brake set-up.
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Don't you have a square pipe plug in the differential that you can unscrew?  |
09-03-2020, 11:56 AM
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CC Member
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Join Date: Jan 2005
Location: Orange,
CT
Cobra Make, Engine: ERA #720
Posts: 117
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Not Ranked
I do have the square plug, I was asking about the gasket because while I have the fluid drained I wanted to pull the cover for inspection.
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09-03-2020, 12:04 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by rads42
I do have the square plug, I was asking about the gasket because while I have the fluid drained I wanted to pull the cover for inspection.
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Jaguar differentials have a casting number at the lower right corner of the cover. All of the gaskets that I've seen for those type diffs had a 3931 number and then sometimes letters after the part number depending on where you bought the gasket from. But if the fluid comes out looking not metallic-ish, I wouldn't pull the cover off. It's not like you can wiggle something and tell that it's loose. If you have a problem back there, you're going to feel/hear it. |
09-03-2020, 12:14 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
And in fact I don't use the plug at the bottom -- those tend to leak when you put them back in, even with the anaerobic sealant on the threads. I pump the old fluid out through the fill hole using surgical tubing, then I put pipe tape around the threads so it's easy to get the plug out the next time and that still keeps it from leaking. Remember to use your LSD additive along with Moroso climbing gear lube. The last time I did mine I needed about 1 and 3/4's bottles of the GM Limited Slip Additive Part #1052358 to eliminate ratcheting around corners when the Powr-Lok plates would disengage.
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09-03-2020, 12:20 PM
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CC Member
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Join Date: Jul 2004
Location: League City,
TX
Cobra Make, Engine: ERA #828
Posts: 148
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Not Ranked
ERA and others recommend not to use a gasket, but a bead of RTV instead.
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09-03-2020, 12:30 PM
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CC Member
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Join Date: Dec 2000
Location: Livermore,
CA
Cobra Make, Engine: ERA #629, BBM Side Oiler Block, 482ci, Richmond 5 speed
Posts: 851
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Not Ranked
If you decide to use a gasket, you need one for a Dana 44 rear end. They're pretty common. Ask for a differential gasket for a 1967 Jeep CJ-5. Here's a link to the one you need from RockAuto. https://www.rockauto.com/en/moreinfo...381238&jsn=892 |
09-03-2020, 12:38 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Really if you're wondering how your Powr-Lok is doing, check the breakaway torque. Here's a thread on it: Breakaway Torque on ERA's Powr-Lok If the breakaway torque is within specs, and you don't have puddles under your differential, and when you drain your fluid you don't see glistening specs of metal in there, then practice the LITFA rule.  |
09-03-2020, 01:51 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Or the "enhanced LITFA rule," which calls for parking the car in the sun and then you LITFA.  |
09-05-2020, 06:28 AM
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Senior Club Cobra Member
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Join Date: Jun 2004
Location: Huntington,
VT
Cobra Make, Engine: E-M 427 Top Oiler stroked to 482 by KC, Stage 2 heads, a Quikfuel and Voila, 640 hp
Posts: 501
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Not Ranked
I just went through this whole exercise and could not find the correct gasket to order. Tried NAPA, Auto-zone and a few foreign car part places. First you need to know what type of rear end. Salisbury or Dana ? After I determined it was a Salisbury, still no luck so I finally gave up and used Permatex Black Max. Worked great and no leaks for the first time in 15 years!
Tim
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09-05-2020, 04:26 PM
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CC Member
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Join Date: Nov 2007
Location: Clayton,
IN
Cobra Make, Engine: ERA 838
Posts: 1,066
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Not Ranked
CJ5 about 1975, diff gasket will fit both Jag variants in ERA.
Telling the parts guy it is a Jag will just make it hard.
John
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09-06-2020, 04:56 AM
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CC Member
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Join Date: Dec 2006
Location: Southbury,
ct
Cobra Make, Engine: ERA, 428, 4 speed Toploader, Jag rear, Red with White stripes
Posts: 922
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Not Ranked
I used the Permatex Ultra Rigid Grey with no gasket a few years ago, worked great
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ERA#698 428, 4 speed Toploader, 3:31 Jag rear
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09-06-2020, 05:01 AM
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CC Member
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Join Date: Dec 2006
Location: Southbury,
ct
Cobra Make, Engine: ERA, 428, 4 speed Toploader, Jag rear, Red with White stripes
Posts: 922
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Not Ranked
Went to rock auto for the hell of it and for a 67 cj5 I am coming up with part # 23006 as Patrick linked. I put in for a 75 CJ5 I am coming up with #23003. Same brand gasket and for a dana 44. I am assuming they are the exact same gasket, why the diff part numbers?
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ERA#698 428, 4 speed Toploader, 3:31 Jag rear
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09-06-2020, 05:16 AM
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CC Member
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Join Date: Feb 2009
Posts: 1,690
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Not Ranked
I went to Autozone, bought some of the blue gasket material, and made one myself. I used a hand held paper punch t make the holes. It looked great.
After it leaked numerous times, I took it off, used RTV, and had no more leaks.
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09-07-2020, 09:42 AM
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CC Member
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Join Date: Dec 2000
Location: Livermore,
CA
Cobra Make, Engine: ERA #629, BBM Side Oiler Block, 482ci, Richmond 5 speed
Posts: 851
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Not Ranked
Quote:
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Went to rock auto for the hell of it and for a 67 cj5 I am coming up with part # 23006 as Patrick linked. I put in for a 75 CJ5 I am coming up with #23003. Same brand gasket and for a dana 44. I am assuming they are the exact same gasket, why the diff part numbers?
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23003 is for a Dana 30 rearend. That's not what you have. You need the 23006 for the Dana 44. |
09-07-2020, 09:48 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
If you don't take the cover off, you don't have to worry about the correct differential gasket number. |
09-08-2020, 08:06 AM
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CC Member
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Join Date: Jan 2005
Location: Orange,
CT
Cobra Make, Engine: ERA #720
Posts: 117
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Not Ranked
Thanks so much to everyone for all the information.
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09-08-2020, 11:05 AM
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CC Member
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Join Date: Dec 2006
Location: Southbury,
ct
Cobra Make, Engine: ERA, 428, 4 speed Toploader, Jag rear, Red with White stripes
Posts: 922
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Not Ranked
Quote:
Originally Posted by CJ428CJ
23003 is for a Dana 30 rearend. That's not what you have. You need the 23006 for the Dana 44.
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Just went back on the site. My bad, you are absolutely correct! I was reading the wrong line when my old eyes shifted to the right to look at the applicable rear
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ERA#698 428, 4 speed Toploader, 3:31 Jag rear
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05-07-2023, 12:40 PM
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CC Member
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Join Date: Jun 2018
Location: Seattle,
WA
Cobra Make, Engine: ERA 427sc
Posts: 98
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Not Ranked
Quote:
Originally Posted by patrickt
Don't you have a square pipe plug in the differential that you can unscrew? |
Thread hijack.. what’s a good tool for unscrewing this in place? It’s too tight a space for anything I’ve got currently. Will definitely try the thread tape trick for putting it back. |
05-07-2023, 02:17 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by Moriarty
Thread hijack.. what’s a good tool for unscrewing this in place? It’s too tight a space for anything I’ve got currently. Will definitely try the thread tape trick for putting it back.
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It's just a 1/2" square pipe plug. A plumber's pipe socket works perfectly. Or, a 12 point socket will have a square grip in it that will fit. I prefer a plumber's socket. |
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