I have raced with TT axles tons of times and only broke one inner axle on a well prepped track. The first day out with an NA subframe, stock turbos i snapped an axle babing the car off the line. I have heard of very similar instances as well from other local buddies in AL.
Get the TT axles/subframe and put the leader gears in it if you need the 4.10 gears. I plan on doing this to my new auto.