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Thread: TKO 600 Rear Seal

  1. #1
    Senior Member cv2065's Avatar
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    TKO 600 Rear Seal

    Hey guys. Took the rubber donut out of the TKO600 tonight from the rear tailhousing. Came out pretty easy. I was inspecting the seal and noticed that a portion of the right side of the seal is flipped out a bit. If you look at the picture you can see it at about the 90 degree mark. I lubed up the driveshaft and installed then removed but it doesn't seem to affect it so must be in the rubber itself.

    Anyone think this would cause a leak and is it something to address now versus while in the car? The rear seal looks like a rubber press fit, so doesn't look like it would be hard to swap out, but thought I'd get some other opinions.

    Thanks.


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  2. #2
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    Yes it will leak no question there. You need to replace it. Pry it out and install a new one with a seal driver, socket or pipe that fits the outer edge of the seal.
    Mk4, Moser M88 rear end, Eaton truetrak, Craft Racing 461 Windsor, MMR pro trans, Glenn’s 1,000 hp cobra fuel system and lots of other parts.

  3. #3
    Seasoned Citizen NAZ's Avatar
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    Replace it.
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    Senior Member cv2065's Avatar
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    Thanks guys. I figured as much. Couple of questions. Does anyone have a part number by chance? Is Tremec the best seal to buy or are there better ones? When installing, do I need any kind of sealant around the edge of the gasket? Also, does the gasket hit a stopping point on install or is it an estimation how far to drive in?
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    Got my engine and TKO 600 trans In 33' Today. And took plug out BUT did not look at seal... OK, thx for the red flag, will look at mine in am......

  6. #6
    Senior Member cv2065's Avatar
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    So, answered my own questions. Hope you don't need it Andy. If you have a seal remover tool, pops right out. I wouldn't use a screwdriver as you could scrape up the aluminum housing. Doesn't look like there was any sealant around the edges of the gasket and the seal needs to be driven to the backstop when installing. Also, the number of the replacement seal is Tremec TCSJ1277.
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  7. #7
    Seasoned Citizen NAZ's Avatar
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    No sealant needed -- it just makes a mess to clean next time you replace it. And as you stated, it's best to use a seal removal tool as you don't want to damage the sealing surface of the bore. Another tip is to use a bit of trans fluid on the ID of the seal and a bit on the slip yoke before assembly -- this acts as assembly lube until trans fluid makes it's way to the seal and output bushing.
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  8. #8
    Senior Member cv2065's Avatar
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    Quote Originally Posted by NAZ View Post
    No sealant needed -- it just makes a mess to clean next time you replace it. And as you stated, it's best to use a seal removal tool as you don't want to damage the sealing surface of the bore. Another tip is to use a bit of trans fluid on the ID of the seal and a bit on the slip yoke before assembly -- this acts as assembly lube until trans fluid makes it's way to the seal and output bushing.
    Thanks Guys. I appreciate the feedback!
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