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Started back in May and its been an adventure to say the least. The C-6 in my 76' is actually and early model '68 transmission. I think I ran into every possible hiccup one could experience with a C6 and even some that haven't been discovered , The major lesson I learned was there are enough little differences from the 67' transmissions to the 76+ transmissions to cause heart ache if you don't have a lot of experience with the C6. Most all rebuild kits you find and upgrade parts are for 76+ C6's and or from E4od transmissions. Heres the short list of what went in it....
Rabestos RED clutches
Alto RED Wide Band
Newer style R-Servo Upgrade / E Lever
4 gear upgrade rear planet
6 gear upgrade forward planet
New bushings/Seals
Torrington Bearings wherever they could replace a thrust washer
Short Rear Race for Torrington upgrade
Updated Low roller sprag (yep went with the plastic E40d type)
Shift kit update for Early C-6
ReFerb pump
Extra Clutch in Forward and Drive Drums
Shinny new Paint !
All kinds of other things im forgetting...
You sir are brave. I seriously considered trying this out last year, but chickened out and just took it to be rebuilt by a shop. I know they are supposed to be an easy transmission to rebuild, but... I could easily see myself wit h a few extra parts at the end, not knowing if I'd missed putting something somewhere.
I'm curious what your total bill in parts was and how many hours you ended up spending if you want to share.
You sir are brave. I seriously considered trying this out last year, but chickened out and just took it to be rebuilt by a shop. I know they are supposed to be an easy transmission to rebuild, but... I could easily see myself wit h a few extra parts at the end, not knowing if I'd missed putting something somewhere.
I'm curious what your total bill in parts was and how many hours you ended up spending if you want to share.
Well I'll preface the price tag with, if I had just rebuilt it stock it would have been very affordable, around $500. Of coarse I had to start the "what can I upgrade" silliness that ended up costing me somewhere in the $1200 range by the time it was over But I also was in the mindset of doing all this work, may as well make it beefy and hopefully more reliable. Man hours is really a perspective and unique to my experience level which is near zero I would guesstimate around 60 hours ??? Now that sounds crazy to those who know what they are doing, but I did not. I had to read, watch videos and go back and disassemble stuff numerous times to address issues I had not done correctly. I also had numerous set backs due to my C6 being an early model and my some of my parts not compatible with the early C6. And there were just times I was seconding guessing myself and tore the whole damn thing apart just to confirm the placement of a torrington bearing or thrust washer. I also struggled to get the desired clearances for all three clutch packs, resulting in replacing old parts with newer parts to allow for the desired clearance with an added clutch... I refused to settle for less than at least the Specs required, because it was just to much work removing the damn thing and the time into the rebuild.
Trust me there were numerous times I questioned starting this project But I dont have a local reliable transmission shop and ordering one of the internet posed its own issues, the tail shaft for a divorced transfer case and the C6 drive shaft that goes along with it are unique and not what you see on the internet transmission shops, so I was stuck between taking it out of town or tearing mine apart....
Nice work! One of the happiest moments in my life (after I did the rebuild and install) was putting the truck in gear and having it actually move...............
The c6 is very simple to rebuild. Just take your time , the first time is slow but anyone can do it The second time is really fast to do. Dont be scared to do it.
The one thing is make sure you have everything before you start. If you do it should take you 8 hrs your first time maybe less. The second time It should take maybe 45 mins.
I got the dvd and watched it through a couple of times and then mine. Its not bad and it saves a ton of money.
C6-R Transmission Superior Fairbanks Super Servo Assembly, from what I read and researched I would be ok up-to an 'E' and shouldn't go higher to H,F and certainly not an FF. Valve body got a shift kit update, do you still think I may have problems ? Or are you referring to the fitment of the Servo, its not a true FOMOCO R-Servo 60's era, its aftermarket and didn't require any machining to the case.
C6-R Transmission Superior Fairbanks Super Servo Assembly, from what I read and researched I would be ok up-to an 'E' and shouldn't go higher to H,F and certainly not an FF. Valve body got a shift kit update, do you still think I may have problems ? Or are you referring to the fitment of the Servo, its not a true FOMOCO R-Servo 60's era, its aftermarket and didn't require any machining to the case.
Nice work! Out of curiosity, did you also drill the valve body in that one special spot to increase the pressure? I believe it's really well detailed on the transgo shift kit where to drill.
Nice work! Out of curiosity, did you also drill the valve body in that one special spot to increase the pressure? I believe it's really well detailed on the transgo shift kit where to drill.
Funny you should ask, I did not drill that hole, I chickened out when it came to that step, it was for additional lubing, but had all kinds of "if you mess this up you ruined your valve body" warnings, so I opted not to drill they implied that it was optional, and I didnt want to push my luck. Mans gotta know his limitations
Funny you should ask, I did not drill that hole, I chickened out when it came to that step, it was for additional lubing, but had all kinds of "if you mess this up you ruined your valve body" warnings, so I opted not to drill they implied that it was optional, and I didnt want to push my luck. Mans gotta know his limitations
Hey I totally get you. I was nervous doing mine because it's not something you can do twice. I did mine successfully without issue but didn't rebuild the entire transmission when I did it. Took a massive gamble by dropping only the valve body and the pan but so far its worked - knock on wood.
The shifts with the kit + pressure increase are way firmer. Very noticeable at highway speeds, but not to the point where it's harsh.
How do you like the F-code servo and all the other mods you did so far? Many miles on the new trans?
C6-R Transmission Superior Fairbanks Super Servo Assembly, from what I read and researched I would be ok up-to an 'E' and shouldn't go higher to H,F and certainly not an FF. Valve body got a shift kit update, do you still think I may have problems ? Or are you referring to the fitment of the Servo, its not a true FOMOCO R-Servo 60's era, its aftermarket and didn't require any machining to the case.
Did you gave to use the four pinion reverse planetary and drum out of a 4R100 to be able to use Torrington bearings in place of the 6&7 thrust washers?
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C-6 Rebuild Done !
, The major lesson I learned was there are enough little differences from the 67' transmissions to the 76+ transmissions to cause heart ache if you don't have a lot of experience with the C6. Most all rebuild kits you find and upgrade parts are for 76+ C6's and or from E4od transmissions. Heres the short list of what went in it....
But I also was in the mindset of doing all this work, may as well make it beefy and hopefully more reliable. Man hours is really a perspective and unique to my experience level which is near zero 
I would guesstimate around 60 hours ??? Now that sounds crazy to those who know what they are doing, but I did not. I had to read, watch videos and go back and disassemble stuff numerous times to address issues I had not done correctly. I also had numerous set backs due to my C6 being an early model and my some of my parts not compatible with the early C6. And there were just times I was seconding guessing myself and tore the whole damn thing apart just to confirm the placement of a torrington bearing or thrust washer. I also struggled to get the desired clearances for all three clutch packs, resulting in replacing old parts with newer parts to allow for the desired clearance with an added clutch... I refused to settle for less than at least the Specs required, because it was just to much work removing the damn thing and the time into the rebuild.
But I dont have a local reliable transmission shop and ordering one of the internet posed its own issues, the tail shaft for a divorced transfer case and the C6 drive shaft that goes along with it are unique and not what you see on the internet transmission shops, so I was stuck between taking it out of town or tearing mine apart....
