Ford C6 Servo Anomalies video.

[68stangcjfb]

I've never seen this before. R servo with an H? Anyone else ever see one?
https://www.youtube.com/watch?v=C_iwEahjA7Q

[Bob Gaines]

I've never seen this before. R servo with an H? Anyone else ever see one?
https://www.youtube.com/watch?v=C_iwEahjA7Q

Never seen one. It is very interesting and I am better informed now for watching that video. For me it doesn't really matter because I would want the R marked servo mainly because it is the typical assembly line expected look but good info to know. A "H" marked servo would be considered wrong regardless of if it had the CJ internals or not. It is not like it can be easily verified one way or the other once installed ether. I don't know if you could count on the slight difference in covers to be consistent between the two H servos or not . Good luck trying to make the argument that it is the same as a R servo in a concours venue. I for one try to keep those type obscure arguments to a minimum.But that is just me.    

[warwick]

In the video what is really far fetched is it looks like the PN on the rare H Servo is the same PN as a R Servo.

[geraldt52]

We had a discussion about this many years ago on the 428CJ site.  We found a number of CJ C6s which "appeared" to be H servos all of which had cast iron tail shaft housings...including my KR vert that I've owned since '72, an original owner California Special 428 CJ, and a very low mileage original KR vert owned by Scott Fuller.  It wasn't an early/late thing, because my KR is very early, and Scott Fuller's was very late.  We found no explanation at the time, but based on the video it would seem likely that these are really R servos made with an H casting.

There was an old mechanic at the Ford dealer I worked for back in the day who used to say if you're working on a Chevy you just need to know what decade it was built in...if your're working on a Ford you need to know what year, what month, what day, what time, what plant, and what supplier, if you want to get the right part.  I've come to know he was more right than I ever imagined at the time... 

[Kent]

Just by the way I would need an H Servo if someone has one for sale. Thanks.

[Bob Gaines]

Just by the way I would need an H Servo if someone has one for sale. Thanks.

Which one? The typical H servo which is relatively still common with the smaller piston or the anomalous H servo being discussed here with the larger diameter piston like the R servo?

[warwick]

I have a May 68 build 427 GTE (H servo C6) and I have been in a number of R servo C6 428/429's back in the day. I have a number of anomalies in my car. My GTE hits gears just like an R clicks off the shifts. I think I need to pull that cover off and see what I got.

[Kent]

Just by the way I would need an H Servo if someone has one for sale. Thanks.

Which one? The typical H servo which is relatively still common with the smaller piston or the anomalous H servo being discussed here with the larger diameter piston like the R servo?

I would like to have the "normal" one for the 67 Shelby GT500 the other one wouldn't fit I think in a 67 C6 Tranny without machining the housing.

[Coralsnake]

I would feel better about his observations if he measured the bores. 

Is it possible the second H servo had sidewalls machined down for some reason or is it actually a different bore size?

[geraldt52]

I have a May 68 build 427 GTE (H servo C6) and I have been in a number of R servo C6 428/429's back in the day. I have a number of anomalies in my car. My GTE hits gears just like an R clicks off the shifts. I think I need to pull that cover off and see what I got.

It'd be interesting to know what you have, but if your 427 GT-E has an aluminum tailshaft housing I think it will probably turn out to be the normal H servo.  All the cars that we found with the unexpected H had cast iron tail shaft housings.  Also, all of them were Mustangs, either KR or 68-1/2 GTs, but that doesn't mean there aren't any Cougars, Torinos, or Cyclones out there. We found no 69-70 C6s with H servos.

I've had 3 CJ C6s over the years, and a GT500 C6.  The GT500 wasn't anywhere even close to a match for the CJs, but if the transmission shifted any softer/slower it sure wasn't noticeable.   

[warwick]

Aluminum tail shaft. What is still confusing to me is that the H servo in video looks to have R servo PN on it. In the cars I have been in with R servo a little push on throttle and you were leaving rubber on gear changes. I had a friend who had a new 70 Cyclone 429SCJ C6 4:33 that you had to almost try not to fry the tires. That is same with my car - the tranny is tuned to go. My car is low mileage original. Another question I have is does the casting have any changes to servo bore housing that are noticeable when looking at trans with pan removed.