what do I need to change in my T9 when going to 200 PK on the engine?

what is 200 pk?

Probably paardenkracht, 200 of which is equal to 200 Pferdestärke which is about 200hp.

[Edited on 11/8/10 by irvined]

torque is the important number but probably nothing.

Have a look at the BGH Geartech website for uprated type 9 boxes