I broke my trans after about 18mo after purchase. It is a level 3 Raptor with 600 hp/tq rating. It is in a 2002 Silverado ext. cab 2wd 5.3 with heads cam etc. except intake TB. Anyway, the input drum exploded, I contacted the company and was assisted in buying all the necessary parts w/ the ATSG manual. after first attempt I had no rev. nor would it roll back in rev or neutral. Took it back apart and found w/ builders advise I stuffed way too much of that trans goo in the check balls and didn't let the trans warm enough to dissolve it. put it back in and was great. After driving longer maybe 100mi or so it started doing it's prob. 1-2 is great, 2-3 is like neutral let off gas it shifts into 3 give it gas goes right back to N. It will do this as many times as you want until shifted down
to 3. then does fine. it also does the same thing on 3-2 as well until shifted into 3. I upgraded all the parts pin-less pistons, everything except the input drum, the input drum is hardened, I just didn't go w/ the Sonnax Smart drum. I've searched on here for days and tried several different tunes. I'm posting a couple of those including the one that's in it, Also some scans.