Custom Transmission Gearing?

Does anyone know any companies that make replacement or custom gears for B-series transmissions?

i think quaife do. type quaife into google, try either quaife UK or quaife america for a full list. i was on the UK website earlier.

http://www.gear-speed.com Saw them advertised on H-T and don't know anything about their products.

looking specifically for a different final drive... like a 3.7 or 3.8... or even 4.0
Doesn't seem like anyone makes them though