I've got the Tru-Track rear-end in my BL E-Maxx. Makes a world of difference, stability wise. Less stuff to adjust/move around/wear out.
Don't forget replacing the slipper, also. The stock slipper will puke it's guts out on a BL Setup. Get the Robinson Gen3 Slipper, it's bulletproof. I've got one sitting in a bag (65t) for when my Hot Racing Double-Up Slipper (6-Shoe) blows out.