Is there a way to tell what vehicle a C6 transmission came from without removing it from the car? I know they stamped the VIN on the top and I can’t access that. Are there any other markings, date codes, stampings, castings that I can get to to tell? If so where are they?
The transmission tag is not there either. Also is there a way to know what line of vehicles a particular servo came in?
I’ve seen conflicting info on this, so I’m not sure, but will an R servo work in any C6? Could someone not change the servo itself and just replace the cover with one that has an R on it?
The only thing I can see on the C6 that I’m looking are the following. D servo with FOMOCO and a part number that looks to be A-C6AP-70027-A, a raised circle with a 3, a small O and a diamond with what looks like a Walmart star in it. Other side has some letters and numbers. Looks like FCBAP 7006D.
D servo would indicate a low performance application. C6AP sounds like a 1966 or 1967 case. The case was made differently beginning with 1968 model year. The 1968 - later cases have a C8AP casting number.
The case can be machined to accept an R servo but will not accept one without modification by a skilled machinist.
Is there a way to distinguish a 66 or 7 case from the later ones other than the C8AP? I guess it could be an 8. Sometimes hard to tell between a 6 and an 8.
Can you put an R servo cover over any of the other servos? Swap out a D for an R?
Done some more research. Apparently the servo covers had the same numbers regardless of what year they were made or which vehicle they were in. In this case C6AP-7D027. Since it’s missing the ID tag, the important thing here to ID is what’s on the left side. The casting numbers which are RF C8AP-7006-D. This would make it a 68 case being C8. The car is a 69 model, but was built in mid to late 1968. Should it have a C8 or C9 or could have either one to be right?
It’s possible to see it either with a borescope or using a mirror and taking a flash photo of the mirror. It appears to be the right case for 68 - 70 but the servo never would have come in a Cougar originally.
The part of the servo that you see is not just a cover, it is the body of the servo. I’ve never seen an R servo for sale by itself. The apply levers show up on eBay some times.
Ford Racing sells a reproduction of the R servo that has nothing on the cover. It is a billet servo assembly, and functions like an R servo, but does not look anything like an original.
From what I can gather and not certain on this but a D servo and possibly the case would have come in a police car such as a Ford Custom or Galaxie with a 390 or 428 and column shift.
The only servo used in the 1969 - 1970 Cougar with 428CJ was the R servo.
Early 1968 428CJ some cars (prototypes and in the first 30 days of production) that came with the PGB-W transmission that used the aluminum tailshaft housing and the H servo.
By mid - April 1968 all 428CJ production with the PGB-AF C6 had the R servo and the cast iron tailshaft.
I’ve found a couple of pictures of the R servo online but can’t read the numbers on them. What would the casting numbers have been and also what was the Ford part number?
You need the piston, the piston seal, the apply lever, and the servo housing in order to change from the low performance servo to the R servo. I don’t have any photos of the apply lever but here are the piston and housing pictures.
In order for it to work you need all the associated parts. Here is the illustration, the code chart, and the parts list. None of these parts is easy to find without a complete transmission.
Thanks that helps a lot. Over on the left it says Model A, C, D, F, K what does that mean? If I’m reading everything right to have the correct setup for an R servo it would contain the following:
Piston 4A: C8OZ( or P)-7D021(or 2)-A
Seal 13A: C8OZ-7D024-A green round cut lip 3.15"
Seal 22A: C8OZ-7D025-A green round cut lip 2.18"
Cover 27A: C8OZ(or P)-7D027A
Spring 28: C6AZ-7D028-A 2.66" and 9.5 coils
Lever 32B or 33: C6AZ-7330-B (or C)
