Lol, that sounds expensive
I actually did some research on the converter hub problem
It seems there was one particular co that uses a certain hub that holds up very well in 904s. When I called Lenny at Ultimate we discussed this for a while and told me he also uses that same hub. Its more expensive and made from whatever steel and is alot stronger, there is alot less slop on pump tangs and he also has never had a failure. Now that Ive said this I hope I didnt jinx myself but I think the aftermarket may be making better parts now