I thought that I might report to y'all about the modifications that I'm making on my C-6.
I ordered a Transgo Transmission Reprogramming kit. SK67-1&2 and a Superior-Fairbanks C6-R Servo.
Over the decades I've used B&M, NAPA, and Transgo kits in many transmissions. C-4, C-6, TH-350, TH-400, etc.
From minor shift improvers (NAPA) to full "competition" modifications. They've all been great and I never had a complaint.
I was going to put the C6-R servo and the Transgo kit in all in one swell foop, but having no prior experience with the C6-R,
I decided to install it first and get a feel for it's value.
This is the easiest transmission modification that I've ever done. Except for the truck exhaust dropping right in line with the servo...
I had to unbolt both sides of the exhaust from the manifolds. (Replaced both donuts with graphite for less than $3)
Four bolts and the old servo came out. Slide the new servo in and torqued the bolts. I reinstalled the exhaust and then adjusted the transmission band backing off the adjuster 1-1/4 turns for just a little quicker shift
I took Belle for a test drive and was amazed at the difference in first-second and second-third shifting! I really expected a very minor change.
But the new shifting is great and I almost hesitate to install the Transgo. The transmission shifts as though I had installed the shift kit instead!
No more soggy shifting. Especially 2-3. Where it had been the typical soft sluggish shift out of second, wait a half second or so and slop into third,
it is now a firm but not harsh quick shift.
I don't really think that I need the Transgo kit but it is already paid for and in my shop. I definitely think that I'll go for the softer shift rather than the somewhat harsher towing shift.
Not too sure that a harsher shifting valvebody in conjunction with the C6-R servo wouldn't result in a too harsh shift. From prior experience a tire-chirping snap-shift is too harsh for the street...
Chuckle, chuckle.
I can always open the transmission again later to change the shift performance.

 

Very good to know. I had the Transgo kit installed when the robbers rebuilt my C-6. I didn't know about the C6R servo.

 

What you have now is prolly good enough unless you plan on high horsepower and racing. Once you drill holes it is hard to take the kit back out. If you do go in it, make sure it still has a factory style band. Not one of those weaker "slip in" style of bands.

 

An update on the C6-R servo that I've been running since last December.

I am impressed and there ain't no doubt. The transmission shifts very nicely. Not too hard chirping the tires every time like most shift kits that I've run. Nor too soft.
The price seems a little high but I only lost maybe a teaspoon of tranni fluid whereas a shift kit loses 8qts. (IIRC). And it took maybe 15 minutes to swap out the servo.
Now I have a Transgo kit sitting in my cabinet waiting for a use...

 

Glad to hear!

 

Sounds like that is the way to go. Keep the kit for your next project.

 

I had to replace the front pump seal a few weeks ago. The rubber seal separated from the metal shell.
I'm at a loss as to why. Now the seal is leaking yet again. Sigh.
But while I was doing that I decided to install the Transgo shift kit, (67-1&2), to supplement the previously installed "R" servo.
There was still a delay shifting gears and a bit of slushyness that I just did not like.
I used the lighter weight spring on the pressure regulator. (?) My memory is kinda screwy since my stroke.
I followed the Transgo instructions and, as always, it is an almost painless straight forward installation.
I really like the way that the transmission shifts. As close to perfect shifts as I could hope for.
The Transgo kit works flawlessly with the C6-R servo. Smooth firm shift with absolutely *no* harshness nor slush.
I'm going to dig into my Wife's transmission next. Her's already has the C6-R servo.

PS.
It is very easy to repair the drilled hole and return the valve body to stock if I decided that the shift kit was a mistake.
Save all of your old springs and label them appropriately. On the drilled hole just drill it out to 1/8" and install a Pop-Rivet being sure to remove the expansion tang.

PSS.
So now I have an "L" servo and an "N" servo if anyone wants to do a low-buck and quick shift improvement just send me a PM.

 

I have the "R" servo in my C6 as well as the Transgo shift kit. It's the best mod to my truck yet. No more lag in the shifting what so ever. Smooth shifting for normal driving and very firm upshifts when I put my foot in the throttle.
I was impressed from the first drive after the mod!