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Thread: Trying to replace rear seal on a C-4

  1. #1
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    Trying to replace rear seal on a C-4

    Hope this is one that gets a "Oh, that's easy" answerer. My C-4 on the '69 stang has the seal bad at the end of the tail shaft where the trans yoke mates up. The rubber is shot and we all know that a holey rubber is a bad thing How do I get this thing out? I have a new one to install and I can see that it will press fit into place but seeing how to remove the old one....having problems here. TIA!
    -Bob
    2007 Shelby GT 500
    1970 Mustang Convertible

  2. #2
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    Use a screw driver or a chisel to get up under the edge of the seal and gently pry out on it until it comes out. Use something to drive the seal in that has a hole large enough to clear your output shaft. An old second gear out of a T5 or Tremec works well for me, can't remember which one I use, it's on my tranny bench.

  3. #3
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    Cool! Thanks Michael and keep safe.
    -Bob
    2007 Shelby GT 500
    1970 Mustang Convertible

  4. #4
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    A bit of a hint - take the screwdriver and a hammer and bend the side of the seal towards the outputshaft in several places, makes prying it out a whole lot easier. Just be careful not to damage the housing
    I can "Visualize Whirrled Peas" - thanks for the ride Vinny, it was much too short!



    -- Dave
    Resident Philosopher

  5. #5
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    What he said, very well put! You're welcome. Ever sell that vert of yours?

  6. #6
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    Quote Originally Posted by rscoupe View Post
    What he said, very well put! You're welcome. Ever sell that vert of yours?
    If you mean me with the vert, yeah, that is the one that CNTLOSE had been modding
    2007 Shelby GT 500
    1970 Mustang Convertible

  7. #7
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    Quote Originally Posted by Black Horse View Post
    A bit of a hint - take the screwdriver and a hammer and bend the side of the seal towards the outputshaft in several places, makes prying it out a whole lot easier. Just be careful not to damage the housing
    Thanks!
    2007 Shelby GT 500
    1970 Mustang Convertible

  8. #8
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    Yay! Got the old one out finally. Being stuck in there for over 40 years it wasn't wanting to leave. Neighbor took a block of wood and the new seal and made a jig for to get it installed. Worked great! Now, that miserable 40+ year-old speedo gear and cable does not want to come out of the trans housing so I sprayed the heck out of it with penetrating oil and walked away until later. So close and yet the little buggers pop up to mess with ya.
    2007 Shelby GT 500
    1970 Mustang Convertible

  9. #9
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    Quote Originally Posted by winner70ta View Post
    Yay! Got the old one out finally. Being stuck in there for over 40 years it wasn't wanting to leave. Neighbor took a block of wood and the new seal and made a jig for to get it installed. Worked great! Now, that miserable 40+ year-old speedo gear and cable does not want to come out of the trans housing so I sprayed the heck out of it with penetrating oil and walked away until later. So close and yet the little buggers pop up to mess with ya.
    I know the feeling Glad to see you working on her!

    Should have the 'vert back in the next day or so. I will post the dyno numbers then.
    2017 BMW 430i
    2012 Chevy Impala 9C3

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