Do you have the servo cover 1/8" from some cherry red exhaust?

I've used the sonnax super 4th servo in many setups and have had no issues.
Is the seal brittle? If so, that's usually always temperature related issue.

I would confidently say that the seal replacement kit 77767K-SK will have you back in business without issue.
They are viton seals. That's about the most robust rubber seal material you'll find.
400 degrees F no problem

 

Thank you very much for your awnser.
Will get 77767K-SK ASAP.

And yes. My servo cover located right near the cat converter (Thanks GM).

I will install my OEM servo and wait for the SK parts to come.
I'll figure out somehow a way to isolate that part of the transmission from the Cat.

 

GM came out with heat shields that bolt to the case from the factory. Does yours have this? Usually they get discarded. You could additionally cover one of those with some sort of heat protectant.

 

Was just going to say the same
There is factory heat shield...it's there for a reason...you'll have to modify it to fit the sonnax servo usually but that's not hard

Want an air gap between the shield and the servo. And also between shield and exhaust

 

Installed temoporary heat shield and my OEM, biggest 2-4 servo while waiting for my new seals kit to come.
My shifts became so lazy ahahh. I noticed right away my 2-3 is delays now with a little flare. I wont go hard on the tranny.

Let me please ask you for an advice. While i already wasted loads of money on my sonnax 2-4 super servos, i have no choice but to reinstall it because the corvette are all chinese cheap stuff :

-My 1-2 shift was a bit snappy in part throttle. My 1-2 acum only had 1 spring inside. Should i go with the older style acum, adding the missing spring to soften it a bit? Because my plate is 1HJ OEM, didnt touch 1-2 feed hole.

-That super weird clunk when 3rd engages and disengages drive me crazy. Sound like you hit a pot with a ladle. Im 100% sure it comes from the servo because it clunks When servo Applies or Releases on both directions. Any cure for this? (No 2-3 HD Valve Installed).
No Clunks with the OEM.

Specs
Band 0.060"
1-2 - .Stock
2-3 - .135
3-2 - .135-
3-4 - .110
BR - .101

I want to use this situation to fine-tune it to a finished product

Any other recommendations? I didnt cut the 4 notches in the cover btw because i didnt want it to be more harsh.

 

I know you are asking maroon so hope you dont mind me chiming in.
You should not be feeling a softer 1-2 or 2-3 or even a 3-4 with the stock 4th servo. It would have 0 effect on the 1-2 .

Now hole sizes wow . To me at least that 2-3 and 3-2 I assume that accum band release size is way big and likely where you are getting the clunky feel I never go over .110 and as a general rule ussually stay arround .093 And if I do use a larger 2-3 like .110 with my really high HP builds I still stay about .093 on the accum side. sounds to me like you are releasing and applying the band to fast. To get a smooth transition some overlap is nessesary of course to much overlap will do the same .

As for the excessive shock of the 1-2 with the billet servo yes I would add the bumper spring back, and note too unless you are actually using your original stock plate that 1-2 size may not be the same as I have seen them in stock plates as small as .065 and as large as .093 from plate to plate in different applications and that is with both used and new GM plates (I mostly use new gm plates) But OE application matters with plates in that area. Also did you make any changes with the VB accum?

Note on the "Chinese" vet servos I got a couple to look over and as much as I hate to say it the 2 I got to check out looked to actually be a bit higher quality than the GM originals they were a bit thicker and had much cleaner cuts , I know that says nothing of metal harness etc but appearance wise they looked good. I used them in a couple my "Budget" builds and thus far at leaast a year later no issues, (Budget builds are stock builds for regular daily drivers not high performance) customers, Budget might not be best term as they all still get new frictions steels band sprag electronics , sunshell and many of my own mods, Just no aftermarket performance parts and stock shifting other than vet servo which I use in all builds unless higher end stage 3 up.

Anyway my two cents for whatever its worth.

 

Thanks for your reply mr Frank!
If you dont mind, could i message you in Facebook in order to get fine tuning?

I have a spare separator plate (lucky me i ordered 3) 🤣🤭

Thanks for your awnser! 🙏

 

And sure you can message me on FB no problem