Jim, I had to duck my head just a bit and move the 72mhz antenna out of the way
I'm running the 430L and 13t but I don't know what the stock main gear is on the T-Rex. I'm also running the 325mm pro woodies but I'm dying to try out the 315's. That 11t should take care of any bogging at the high pitch but I hope it doesn't slow down your head speed too much.

Here's an amazing video of a glider for Rick! I wouldn't try this with the Bird of Time!
http://www.youtube.com/watch?v=Vi0hr...eature=related

Blessings,

Jay