2006 2wd TBSS, scaled tune with 10psi of boost.
Trans is a 4l70e. From front to back: Circle D stage 3 billet multi disk 3600 stall, billet input shaft, billet pump rotor, Sonnax pump spring, boost valve, boost valve spring. Pump has been modified for oil return off the front seal. Wide drum with wide kevlar band, Sonnax input drum with reinforcement sleeve, circle D billet piston. 3-4 pack setup with 9 .062 BWHE clutches and 8 .078 steels, had to take out one steel in the middle of the pack and put two thinner steels back to back to get a clearance of .035. DID NOT put back in the spring clips with the new sonnax springs. Beast shell, billet output shaft. Valve body has all sonnax goodies with an 07 seperator plate. TCC slip programming has been eliminated, Billet servos.
Problem
I burnt up a 3-4 pack about a year after a rebuild. I attributed it to abuse and adding the blower. The rest of the trans looked great, but I picked up the new converter, did some valve body work, and added the new sonnax drum. The 3-4 lasted about a week.
The 3-4 held up great under WOT, Both times I have burnt them up are under 50-70% throttle. First time was on a highway on ramp, second time was going from a 70mph cruise trying to catch up to the convoy, but not enough to downshift.
The tune is scaled for 60lb injectors. Running an LS7 maf. I havent touched hptuners in over a year due to a deployment, and I know this tune is FAR from being correct. Im just wondering if there is anything obvious that sticks out that would attribute to part throttle 3-4 burnup.
Here is the tune I had the first time, and revision 2 was the one I had this week when I burnt it up.
And here is a log and config from when I put it all back together.