Help ..904 has died 4 times !

PS...tons of guys swear by the 904's cuz they are lighter......I dont drag race my vehicle...I spent 6 years building it...not really into beating the crap out of it...but I will say this...I went with a big block innerds with a small block bell housing 727.....and I have driven well over 200 miles and not a burp....it also has a trans go 2 kit in it and it squaks em from 1st to 2nd and from 2nd to 3rd. I have heard that if you do not have your kickdown set correctly that can seriously hose your tranny....good luck