Gm 4l80e torque converter?? Failure?

[Jefuk]

Hello Americans I've a v12 jag with your auto box gm 4l80e and after a road trip around Germany <140mph chasing audis I was at 30mph, in Belgium it seems to have given up.
So along with some bangs from The drive line I had sloshing sounds and on checking the fluid levels it's now higher than when filled. My thinking is tourque converter ruptured and now sump is full.

Does that sound like tourque coverter failure?
Part from jag is nla and jags in Belgium. Safe to say for a £1k part I want my car back.

Anyone have a recomended supplier?
Standard engin is 365 lb?ft (495 N?m) at 3650 rpm myn is lightly breathed on but I thought these boxes were double 'ard
Would a good stall speed be in the 3200-3600 range?

Extra irrelevant etc
I know people drag these things so kind of supprised I smashed one I think I'm ~400bhp at 6krpm. It feels like it's pulling harder all the way through to 6k not slowing after 5k like standard power trace indicates (ported heads uprated exhaust sports cats) gentle breathing thinghs although the aim is euro 3 (smashed the 2) not bhp

Edited by Jefuk on Sunday 17th September 00:18