I have a 4l60e with a trans cooler and the corvette servo. i recently ordered a sonnax performance pak and instakked it except for the boost valve and the pressure limiter. After some mess ups and fixing including a broken TCC solenoid and a spring, I have some issues.
The symptoms:
-1,2,3 work good, drive is a tiny bit sluggish at low Rpm.
-in reverse the truck will shake but act like its in park.
-in nuetral on a hill it will roll back like normal but on a flat surface it will creep forward like drive normally does
-park seems like it works fine

honestly stumped. i checked the linkage and i think its good but im not sure, im not a transmission guy.
can anyone point me in the right direction on what could be causing this?

 

any dtc?

 

The only code it threw was the TCC solenoid missing, and i replaced it and no more codes were thrown. It's at a transmission shop right now, but I'll post what the problem was once I get it back for anyone who has this problem again.

 

Sounds good..I'm curious to know

 

Subscribed. I'm curious too. I will be installing that kit on my new to me 4l65e in the near future.

 

well, bad luck guys. what all these symptoms mean is the forward clutches are fused together, requiring a complete transmission rebuild so im quoted 1550 to rebuild it. im gonna have it rebuilt with the sonnax kit re-installed, and upgraded 3-4 clutches for a future cam. gonna have to send my cam back to help pay for it too...so no cam yet, just a new transmission and no new parts for a while.

 

How in the hell did you do that? They mustve been on the way out to begin with....

 

Probably. Wierd though, only 60k miles on the trans. The only thing i did was a servo swap and a trans cooler. I drove it maybe 40 seconds in total after, so that's what i think did it in. Unexpected huge expense though, right before school starts too. I'm getting it rebuilt with an upgraded 3-4 clutch pack as well as making sure the sonnax kit is done correctly. So should be enough to handle a cam in the future.

 

What cam did you have that youre sending back?

 

A Texas speed stage 3 216/220 with ls6 springs. Sounds perfect and fro what I researched it can handle a canned tunr until I get a custom one.