First thing you'd want to upgrade right away are the driveshafts on the Emaxx brushless edition. Traxxas driveshafts although improved plastic just can't handle hard starts, stops, and landings. I wish they'd just come out with steel ones right away like the Savage Flux.

I broke the center rear driveshaft the second time out. This was from doing too many wheelies down a street. I also run only 6s which put more strain on the shafts.

I bought part #TRA4951R which is the only center shafts front and rear. On the 4 corners of the rig I am using MIP shafts. Unfortunately MIP does not sell the center driveshaft set which is why I used Traxxas.

After that I would recommend upgrading the arms/shock towers to RPM. Followed by the bulkheads and hinge pins. Bulkheads you'd want aluminum ones...but of course when you do so any flex will be transferred to the hinge pins which is why you'd want to look for titanium replacements.

Some Emaxx owners upgrade the differentials as well depending how bomb proof you want to make your truck. An affordable popular upgrade Emaxx owners do is to replace the stock diffs with Ofna Hyper 7, 8, and 8.5 diffs. I haven't personally upgraded mine or shimmed my stock Traxxas diffs but they are still holding up.

Check out www.unlimitedengineering.com or FLM (Fast Lane Machine) for quality upgrade parts!

Basically driveshafts, arms, bulkheads, hinge pins, and shock towers are the weak spots I've found with the new Emaxx. The Emaxx old and new models have a huge following where you can find other bomb proof builds.

Good luck!