I have read that the Sonnax binds up worse than stock and I know at least one big name player will only use TCS. Having said that I have zero Sonnax servo experience. I read what I read and gave it away in favor of the TCS. Are you doing a 4.2 lever and billet strut and anchor as well? It seems most are choosing 4.2 levers.

 

I was going with the stock lever and a billet strut and anchor.

 

From what I was told is that the TransGo kit pressure is set up for the stock 5.0 lever. I just installed this same kit and I stayed with the the stock lever and I used the Sonnax billet cover with new strut and anchor. The only thing I did not do is drill the holes for TC lockup. Everything seem to be working great shift are a lot better.

 

Have the red Sonnax servo sitting on the bench. Been sitting there since it was replaced with a TCS servo, TCS works better with shift kits and double return spring. Do get a billet strut good protection.

 

How is it better (as I'm helping a friend build his soon)?

 

One of my best friend works for Sonnax. I let him know and he should respond soon

 

Is he going to redesign it? lol

 

http://d2q1ebiag300ih.cloudfront.net/uploads/instruction/file/1849/22301B-01K_SK-IN.pdf?v=1431540279

Read the warning to the right of Sonnax intructions. The red servo just has shift timing issues with different shift kits and builds. I have used both TCS and red Sonnax servo and like the shift quality of the TCS is my set up.

 

Figured I'd try this old thread before starting a new one.
Just finished up the transgo kit, and then noticed there's a billet servo in there. It's not a red one, and it's the one that is normally plastic stock/oem. Is this going to cause shifting problems? I'm also installing a billet cover (2nd gear I think), and I drilled one 1/16" hole in the valve body for firmer shifts. I also installed new borg electronics and filed that notch in the valve body like the instructions said.
*the new transgo kits have other new parts I used as well. I can only imagine that these new parts have improved the kit.

I appreciate any advice or experience with this situation!