I'm having lockup issues in 4th. It'll work fine for about 10 min, then gradually unlock. freeway lockup around 1800rpm, then it will slowly increase to like 3000rpm+. I think the trans is fine, but this is the 2nd converter I've had problems with and another swap is so freaking expensive!

Should i try a warranty replacement or switch to Yank? I bought it from Speed Inc. about 6 months ago, put about 7k miles on it. Vig also offers a free stall change....i was thinking 3600 maybe