Size and/or source for C4 transmission "O" ring - Vintage Mustang Forums
 
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post #1 of 7 (permalink) Old 09-19-2019, 06:32 AM Thread Starter
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Size and/or source for C4 transmission "O" ring

I need the size of the O ring that fits on the shifter arm for the C4. If you click on the video link it starts right on the video that he show the location and placement of the "O" ring.


64 1/2 coupe 260 automatic
Mfg date 8 days after the Mustang debut
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post #2 of 7 (permalink) Old 09-19-2019, 07:17 AM Thread Starter
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Please delete post. I finally found a site that listed the parts and ordered parts.

64 1/2 coupe 260 automatic
Mfg date 8 days after the Mustang debut
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post #3 of 7 (permalink) Old 09-19-2019, 07:55 AM
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Willing to share the site with the C4 parts? I am about to go through one of mine.

'68 coupe 289 C4 (featured in Mustangs & Fords July 2003)
'67 convertible 5.0L EFI conversion (appeared in Mustang Monthly Feb 2017)
'90 LX 5.0L
Www.ccrestorations.com
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post #4 of 7 (permalink) Old 09-19-2019, 08:21 AM Thread Starter
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With the lack of response of my transmission threads I didn't feel that there was any interest,

The site that I used is:

https://transpartsonline.com/TRANS_P...nsPartsType=C4

64 1/2 coupe 260 automatic
Mfg date 8 days after the Mustang debut
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post #5 of 7 (permalink) Old 09-19-2019, 10:34 AM
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I didn't see the kickdown O-rings listed there. As I recall most kits that have them in it offer a choice to use a plain O-ring or a "quad ring". Seems to me the quad version works a tad better.

I used to source online parts through "Bulkpart" but it seems they have vanished. I appreciate the link. Transtar only sells such as part of a larger kit.
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post #6 of 7 (permalink) Old 09-19-2019, 11:46 PM
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You are correct Gypsy; the newer style quad ring is the way to go. Double the sealing area, and the ring contacts the shaft and lever where the "O" ring didn't, so it sealed on a clean unworn area.


xring-diagram.png

Last edited by Precision Transmission; 09-19-2019 at 11:51 PM. Reason: add picture
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post #7 of 7 (permalink) Old 09-20-2019, 10:16 AM
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Dimensions for the shaft seal O-ring I copied from a video: .650" OD, .381" ID

Here's the link to McMaster-Carr's O-ring page. I didn't get a hit on Quad Ring, although they do have X-rings (maybe the same thing?).

https://www.mcmaster.com/o-rings

You have to buy a bag of 50 or 100, but still cheap. The dimensions above work out to about 1/8" cross-section. I didn't see one with these dimensions in their list, so I may have copied wrong.
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