Quote Originally Posted by Matt93SE View Post
...I use gears 2,3,4 on the stock tranny; on the longer tracks, I use 3,4,5.

We run the same tracks. By your own admission above, you only use 4 gears right now. My 4 speed Jerico works great. I am in the sweet spot on my power band from 65-140mph, RPM drop is only 1300 between gears. I am not changing rear ends for TMS/TWS. First gear is 1.72 so it's a little sluggish around the paddock. You'll see this weekend at MSRH that a 4 speed does just fine, although I will only use 1-3 there. If you don't have a gear calculator, PM me and I'll email you one. I think you'll find a 4 speed is more than sufficient.