Shift Shaft Seal

Discussion in '2005+ Mustang GT 4.6L Tech' started by Deerhunter4, Feb 21, 2019.

  1. Deerhunter4

    Deerhunter4 Junior Member

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    I’m confident that my trans fluid leak is coming from the shift shaft seal (2008 GT). What I’m confused about is how to make sure I get the correct seal. Rock Auto lists National 221410 but I see that same seal listed as the a tail seal on other sites. Can anyone confirm what part number I need for the shift shaft seal. My leak is pretty bad so I’ve got to do something pretty soon.

    I found a few other threads discussing this seal but none that helped me much. I’m hoping this is something I can do in the garage without removing the transmission. I know it’ll be tight but I think it can be done. No YouTube videos that I’ve found on this one so I’ll be flying blind this time.

    Thanks guys.


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  2. 07gts197

    07gts197 forum member

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    The output shaft seal looks similar but has a different part number. I have not replaced one so I cant say whether thats the right part or not though.
     
  3. 1950StangJump$

    1950StangJump$ forum member

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    I replaced both on a 3650 recently. Did the driveshaft seal first, only to find it was the shift shaft seal that is leaking.

    The shift shaft seal can be a bear. There is a bolt at the top that will unhook the linkage from the shifter easy enough -- you can't see it from under the car, so you'll have to reach up and feel it. Once the linkage is unhooked, getting the seal itself to pop out of the transmission is what will get you cussing. You'll use a pick, small seal puller, and/or small screwdrivers. Once you start trying to pull it, you'll mangle the old one, so you'll quickly be at a point of no return. Just be patient and know it could be a 10 minute job or a four hour job.

    Lube the outside of the new one so that it slides in undamaged. Find a deep well socket that is just a hair smaller than the diameter of the shift shaft seal, then use that socket to drive the seal in straight with a hammer. I found that part easy.

    I used a Ford seal: 4R3Z-7052-CA. Got it new from a dealer for $15.80 shipped off eBay.
     
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  4. Deerhunter4

    Deerhunter4 Junior Member

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    Thanks a lot for the info. That’s exactly what I needed. I’ll order a seal and report back on my experience.


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  5. Deerhunter4

    Deerhunter4 Junior Member

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    Got the seal replaced. What a pain! Just kept picking at it like everyone says and eventually was able to pull it out. New seal installed easily. Fingers crossed that was where my leak was actually coming from.


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  6. 1950StangJump$

    1950StangJump$ forum member

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    Good deal :)
     
  7. stang_gang

    stang_gang forum member

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    Hey guys I think mine is leaking too. Is anyone able to show me a picture of the seal in the trans just I know what to actually do?
     
  8. 1950StangJump$

    1950StangJump$ forum member

    854
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    The names are pretty indicative of what you're looking at.

    The driveshaft seal (aka tail shaft seal) is the easier one - it is the larger o-ring where the driveshaft yolk meets the transmission.

    The shiftshaft seal is more of a pain, but I suspect it is most often the culprit of the leaks in that area. It is the smaller o-ring where the shifter lever enters the transmission.

    Here's a thread on the driveshaft seal

    https://www.s197forum.com/threads/3650-tranny-leak-output-shaft-seal.134901/

    I had thought my driveshaft seal was leaking and replaced it. Turns out, the shift shaft seal, which is above it, was leaking down and giving me a false impression. I had to double back and do the shift shaft seal after.
     
  9. stang_gang

    stang_gang forum member

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    I’m pretty confident it’s my shifter shaft seal since the top of the trans is covered with oil which has now started to leak down the sides. I just installed a hurst shifter and when I was under there I noticed all the oil. Also do any of y’all know the part number for the inserts that are used where the shifter shaft and linkage bolt up? I’m not talking about the inserts where the linkage bolts to the actual shifter though.
     
  10. rocky61201

    rocky61201 forum member

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    A pic would help because I'm not 100% sure what you're asking for. If it's the plastic bushings/inserts I think the only way to get a replacement is order a complete stock shifter assembly from a Ford Dealership for a hefty price tag. The alternative is the replace the plastic bushings with bronze bushings from AMP performance. You can find those by searching amazon or eBay. It comes in a kit with 5 bushings total and you need all 5. It's a nice upgrade for about $40 bucks and you'll be surprised how much free play/slack it takes out of the shifter movement from one gear to the next.
     
  11. stang_gang

    stang_gang forum member

    87
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    Is this it?

    https://www.amazon.com/AMP-Mustang-Tr3650-Shifter-Bushing/dp/B00WCHCK7A
     
  12. GlassTop09

    GlassTop09 Member

    322
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