New TCI Streetfighter won‘t shift in 3rd when hot

I noticed there web site says to use there “Break in Trans fluid” & then there own “Trans fluid” with there transmissions. There probably funny about that and who’s converter you used.

There “Max Shift” fluid is closer to “F Type” fluid.
For break in I used Dexron 3.
I am using a new TCI Streetrodder converter.