I wouldn't get too fired up about getting more than about 2.5-3:1 out of the tcase, due mainly to the chain front drive, and the splines on the front shaft not being strong enough. That is all quite apart from actually having the clearance in the case for the new gears.

2002 Sporty , Ironman 2.5" spring, 2" body, 15 x 7 ROH wheels, K&N, 15 x 10.5 Simex Centipedes, Powerchip 91.

"Never argue with an idiot. They will bring you down to their level then beat you with experience!"