Rebuilt 904, no 3rd gear???

My brother and I rebuilt my 904 to go behind a mild 318.

We used a high performance rebuild kit, with red clutches, kolene steels, a HD band strut with a 4.2 lever, red low reverse band, red second gear band, and a rebuilt front pump, with a PTC 3000 stall converter, and a transgo 2 shift kit.

Every other gear works, it shifts from 1st to 2nd, but not into 3rd, reverse also works, and i unhooked the kickdown linkage and test drove to see if it shifts into 3rd. it does not. i did the tests the ATSG manual says to do, all the pressures in the tests are higher across the board, my guess is because of the shift kit, correct? any help would be appreciated on what you guys may think they problem might be?