Leaks: FMX Trans shift rod & Power steering box

[69 Rustang]

Transmission:  My FMX leaks at the shift selector shaft on the drivers side.  I replaced the seal on one of these 30 years ago, but I don’t remember if it was just an o-ring or if it was a special seal with a inner spring.  Anybody know for sure?  If it is just an o-ring, is it anything special or just a generic o-ring?  If special, any idea what to order?

Steering Box:  For the power steering box I figure it is likely the main shaft that holds the pitman arm.  On my last car (a ‘73 Mustang) that was the leaking point.  For that one  I bought a rebuild kit.  I couldn’t get the box apart, so I took it somewhere and they put the seals in while I waited for 40 minutes or so.  I looked at NPD for a seal kit and didn’t see a kit that looked the same.  This one seems to be most extensive:  3C538-1  https://www.npdlink.com/product/seal-and-gasket-kit-steering-gear-master-kit/148828    Any input or advice on this?

Thank you!

 

[71ProjectJunk]

For the FMX seal there is a writeup on the forum on how to do it and what is involved:



There is a video on YouTube too:

 

[69 Rustang]

Thanks for the links.  After reviewing I found the shaft seal at NPD, but not the O-ring.  The part number(s) for the shaft seal is:  D5AZ-7B498-A, C7AZ-7B498-A or NPD’s number of 7B498-1.  Does anyone know if the O-ring is special or can a generic o-ring be used?

 

[Bentworker]

I am not positive but I think the seal may be obsolete.  Last FMX kit I bought from Rock Auto used an o-ring

 

[Hemikiller]

The shift shaft seal is common to FMX, C-4 and C-6. and is still available from Ford under the D5AZ-7B498-A. The one NPD carries is the genuine Ford part, or you can go to your local Ford dealer. 

https://www.npdlink.com/product/seal-shift-shaft-to-case/106028

The kickdown shaft seal is 1P-77265-B, or you can use the 368078 o-ring. Found the size in the link below, 9/16" OD x 3/8"ID, which makes it a #110 o-ring. 

https://www.ford-trucks.com/forums/1549532-c6-shifter-shaft-kickdown-seal.html

https://www.mcmaster.com/o-rings/id~0-362/width~0-103/

 

[Gregaust]

An O'ring can be used and does work. The "correct" seal for the kickdown is what is called a quad seal. Like a square cut o'ring that has a lip on each edge