Go with the 410. Those 20's certainly aren't helping you get off the line quickly

 

Haha. Yeah I can't seem to get them to spin in first but they will in other gears? Lol. Doesn't make much sense to me.

 

On American Muscle there are some options for an install kit and bearing kit along with a rebuild kit for the Traction-LOK. Are these typically advised to add just as a common rule of thumb to make sure that nothing breaks?