Torsen diffs are not strong enough for BL power, nor are Kyoshos LSDs. They are good for as long as they last, but they won't last long.
That Savage has a Hotbodies Diff.
BTW, racing is just as tough on the trucks as is bashing, IMO. Because you push the trucks real hard, non-stop. All you need is a good track, a real track

I started as a basher too. But since I have been to a couple of races I don't care about bashing anymore... bashing is fun on big BMX tracks and stuff, or trying to hit rails and boxes skate-style, but once you have done every flip or trick you can imagine, it just gets boring. Racing is pure adrenaline, and a lot of fun for me.
To each his own, cheers.
Daf