Strongest Eaton synchro-6 version.

Hello. Whats the strongest version of the eaton 6 that would mate to a dt466? In one if my trucks I have a fso6406 but its a 185hp dt466. My other truck has a 300hp one but I need to change from a 7sp spicer to a synchro 6.

I did a lot of reading and see there version (generation) differences, and the torque differences, but when I try to look for one that I think is fitting, it seems they are old and discontinued.

So if anyone has more knowledge on them Id appreciate it. Something like a FS8406.

Thank you