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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

C6 shift lever drooling

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Old May 17, 2018 | 12:19 PM
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C6 shift lever drooling

Sorry if this has been covered before, but I keep finding confusing results in my research.

I have a 68 F-250 CS, 2WD with a C6 that leaks fluid around the shift shaft. I'm pretty sure it's not just the outer O ring because the fluid is bleeding out from between the lever and the trans case. Nasty mess, but replacing the seals looks fairly easy.

The problem is that the name "Cruise-O-Matic" seems to be used somewhat loosely. The guys at Macs aren't sure. The description on their page says "Oil seal & O Ring - Cruise-O-Matic C4 & C6" but the 'fitment' section says "Fits Cruise-O-Matic transmission only."

What's the deal? Is a C6 a Cruise-O-Matic or not.

https://www.macsautoparts.com/ford_m...YaAmikEALw_wcB

Swiped this pic from another thread:

 
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Old May 17, 2018 | 02:09 PM
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mine leaked from there to , you need to drop the pan and take that lever completely out . I had to cut and bend a box wrench to fit in the tight area inside to get the nut loose and to tighten it back up ( i put some blue lock tight on) to make sure it didn't wiggle loose .
I bought a 68 c6 trans gasket kit off ebay that had everything i needed but the correct yoke seal . had to get that at autozone
 
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Old May 18, 2018 | 02:39 AM
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Originally Posted by Coastal68
Sorry if this has been covered before, but I keep finding confusing results in my research.

I have a 68 F-250 CS, 2WD with a C6 that leaks fluid around the shift shaft. I'm pretty sure it's not just the outer O ring because the fluid is bleeding out from between the lever and the trans case.

Nasty mess, but replacing the seals looks fairly easy.

What's the deal? Is a C6 a Cruise-O-Matic or not.
Yes & no.
When introduced in 1966. the C6 was referred to as a C6 Cruise-O-Matic. Several years later, Ford dropped "Cruise-O-Matic" from the title, trans then became known as the C6.

Lower pic, 7B498 is the only seal...there's no o-ring.

 
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Old May 18, 2018 | 07:13 AM
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Originally Posted by NumberDummy
When introduced in 1966. the C6 was referred to as a C6 Cruise-O-Matic. Several years later, Ford dropped "Cruise-O-Matic" from the title, trans then became known as the C6.

Lower pic, 7B498 is the only seal...there's no o-ring.
Thanks! That explains the confusion.

My '68 has the neutral safety switch on the steering column. What year did Ford move it?
 
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Old May 18, 2018 | 07:44 PM
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Originally Posted by Coastal68
My '68 has the neutral safety switch on the steering column.

What year did Ford move it?
1978
C7TZ-7A247-A .. NSS - MX/C4/C6 (Motorcraft SW-600) / Obsolete ~ Available NOS & from auto parts stores.

1967/77 F100/350. NSS located on the trans beginning 1978, C4 uses a different NSS than C6
 
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Old May 26, 2018 | 01:35 PM
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Originally Posted by NumberDummy
When introduced in 1966. the C6 was referred to as a C6 Cruise-O-Matic. Several years later, Ford dropped "Cruise-O-Matic" from the title, trans then became known as the C6.

Lower pic, 7B498 is the only seal...there's no o-ring.

7-7265 IS AN O-RING.
 
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Old May 26, 2018 | 01:48 PM
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Originally Posted by JEFFFAFA
7-7265 IS AN O-RING.
Yes, IP-77265-B to be exact, but notice its location next to the 7A247 NSS

How many 1967/77 F100/350's have the NSS in this location? None. Pic is in truck parts catalog, but it's from a car.

So, I assumed that the o-ring was car only.
 
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Old May 26, 2018 | 02:01 PM
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Originally Posted by NumberDummy
Yes, IP-77265-B to be exact, but notice its location next to the 7A247 NSS

How many 1967/77 F100/350's have the NSS in this location? None. Pic is in truck parts catalog, but it's from a car.

So, I assumed that the o-ring was car only.
I have the seal and O ring on the way from Mac's. I'll post pics of what I find when I get into it - probably Thursday or Friday next week.

This is the description on Mac's page:
 
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Old May 26, 2018 | 02:28 PM
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Originally Posted by NumberDummy
Yes, IP-77265-B to be exact, but notice its location next to the 7A247 NSS

How many 1967/77 F100/350's have the NSS in this location? None. Pic is in truck parts catalog, but it's from a car.

So, I assumed that the o-ring was car only.
True the Bump had the column mounted C7TZ7A247A. But also the O-ring. This O-ring fits in to the end of the 7A256 .To seal it's I.D.
 
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Old May 28, 2018 | 12:04 PM
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You'll have to drop the pan and the valve body to remove the retaining nut inside. The larger seal is for where the shifter goes into the trans body. The smaller one is for where the kickdown goes into the shifter.
 
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Old May 28, 2018 | 01:59 PM
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Originally Posted by Old Coyote
You'll have to drop the pan and the valve body to remove the retaining nut inside. The larger seal is for where the shifter goes into the trans body. The smaller one is for where the kickdown goes into the shifter.
That's my understanding. Shouldn't be too difficult, just a little messy. Fun, fun, fun.
 
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Old May 28, 2018 | 02:03 PM
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Yes, you'll be wishing your tranny had a drain plug. By the way if you are lying under there be careful with proper support and chocks. Don't forget it's the shifter you are pulling so it will be out of gear. Good luck.
 
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