Hello, I'm posting this in the Diesel Engine category, being it seems most of the transmissions in the tranny section are gas. I had a couple of questions on the Allison trans tuning. I've tuning 4l60e,4l80e, 6l80e transmissions before. But this Allison seems like I can not get it to shift smooth. It always seems too firm. The trans supposedly has modified valve body, and a billet converter. I reduced line pressure in 10% increments, but it still slams into gear. On a rare instance it will shift pretty good and firm. But it seems it is not repeatable. Drove it around and tried to let adaptives learn, but seemed to just get worse. Also downshifts are crazy, slipppp and bang. It is odd that none of the shifts work very well. Is it possible that modified valve body could have something to do with it,and the billet converter? Vehicle is 8.1 gas truck with Allison 5 speed. Any input would be appreciated!