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By mrmike - 9 Years Ago
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Hi, My rear end differential is leaking oil & I would like to change the gasket on it. Anyone know the part #?. It has a tag on it with the #4148. I cannot find that anywhere. I was also wondering about taking the plate off. I removed the drive shaft & the 10 nuts on the cover. How is it "pryed" off after removing all the nuts off the bolts without damaging it? Thanks, Mike
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By Dobie - 9 Years Ago
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http://cgfordparts.com/ufolder/fordpart.php?number=8A-4035
I think most of the usual suspect suppliers have 'em. To get the cover off try a thin metal putty knife and a light mallet. Find a good spot on the cover and lightly tap the putty knife blade into the seam between the housing and the cover. Once you get the blade in gently pry on the cover to work it loose.You may need to tap the blade in at several spots to get the cover loose, it's likely been on there for 62 years give or take. Good luck!
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By mrmike - 9 Years Ago
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Thanks, I will try that. This is the original and never been apart. What rear end is it? I have looked everywhere on the internet & in my books & cannot seem to find it. The case cover is 10 bolt & is basically just round. I don't want to order the wrong gasket. Any preference to manufacturer of the gasket? Thanks, Mike
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By Dobie - 9 Years Ago
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There is precious little info out there. I believe they were either made by Dana or Spicer (separate companies at the time). They were 8 inch but have no commonality with the later 8 inch Ford diffs. If you have an automatic trans the ratio is likely 3.45:1. A manual w/o OD would be in the neighborhood of 3.78 to 3.90. If you have the 3 speed with OD it's prolly a 4.10 or 4.11. Use whatever brand gasket you can find, they're just thin paper. Are you sure the cover gasket is the source of the leak? The pinion seal is usually the more likely culprit.
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By MoonShadow - 9 Years Ago
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I've done a lot of online searching and old guy questioning about the 49-56 rear ends. As far as I can tell they were never identified as 8" or anything other that 49-56 Ford. I do remember that they were plagued with broken axles back in the day. Possible the result of lack of posi traction. Strangely enough I actually found a NOS posi unit on EBAY years back. I've been running it for several years now and it works quite well. In fact if you jump on the gas in a turn the car will try to straighten out as both wheels are driving. The guy that installed it for me said it was similar to the Ratchet lock system in the 60's Mustangs. I've collected a couple of spare units and axles so I hope to keep running the stock rear for a while. I'm not sure what my new Ted Eaton blower motor will do to it and/or the AOD transmission. Many say they won't take the torque. We'll see next spring. Chuck
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By mrmike - 9 Years Ago
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Thanks Chuck, this is the only thing that I found also. I don't think I am going to fool with it as it would be a lot of work. All these gaskets that they sell don't describe them very well, just a Picture & some part # ?? This one looks round and all 10 bolt holes are spaced 2 3/4" apart. Anyhow, I will just replace the oil & keep an eye on it............. On to the transmission...... I have a replacement with Torque converter as this one leaks a lot. I did have it out before & reinstalled it but can't remember ,if I removed the whole tranny with the bell housing attached or not? Senior Moment I guess. Any Suggestion on removing it?
Mike
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By MoonShadow - 9 Years Ago
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Just re reading the posts. Does your rear end have a cover on the back? Not a pumpkin type? If so its a Dana rear and that shouldn't be such a terrible job. I would get a new gasket though. There are some sealers that a "gasket makers" not sure how good they work but its not a big gap to seal. I would think, lacking a gasket it would work. Pictured is a pumpkin type or center chuck rear end.
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By paul2748 - 9 Years Ago
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If it is a Dana rear with the removal back cover, then the gasket is available from the TBird parts suppliers. CASCO has one, part # 4035A, 6.52 plus shipping. I assume the other parts suppliers have the same thing.
To get it off, if it's stuck to the housing, use a thin blade like a putty knife and go around the outside with it.
When installing, use a thin layer of some type of sealant on both sides.
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By 62bigwindow - 9 Years Ago
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Why don't you make it yourself? Gasket material can be bought at any auto parts store. I've made a countless number of them with no problems at all.
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By mrmike - 9 Years Ago
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It is the pumpkin type and looks like the one you pictured, that is why I decided not to do it. Thanks Mike
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By MoonShadow - 9 Years Ago
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I believe I have an extra gasket or two in the shop. Do you want one? PM me with your mailing information and I'll send it. Chuck
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By mrmike - 9 Years Ago
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Thanks Chuck, but I decided not to do it since it involves pulling the axles. I am changing out the tranny right now, as my old torque converter leaked a lot of fluid. Mike
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