If you haven't read varunaX's "how-to" suspension setup, you need to do yourself a favour and check it out here: http://traxxas.com/forums/showthread...ips-and-tricks
Backstory: I bought the brushed MERV, and then upgraded it to brushless with the vxl3m and 380 Velineon motor. After upgrading, I could barely turn on pavement without sending my MERV cartwheeling far and away, and this was with nihm batteries! Even at moderate speeds, the MERV would three-wheel through corners.
Fast forward: I followed varunaX's guide to order about $7 worth of stuff off flea-bay. Using the stock shock bodies and pistons, I replaced the stock "oil" with 80wt Losi silicon shock oil. I pulled the black springs from the back and put them on the front. I then put blue summit springs on the back. I then adjusted all four corners so that the driveshafts were just above horizontal after recovery.
Wow, what a difference.
I just got back in from my first runs after upgrading the springs + shock oil. It was very cold out (about -10 C), but dry. All runs were on pavement.
It was impossible to flip or cartwheel the MERV.
I can't believe that $7 worth of springs and shock oil can make a world of difference. I could plow my MERV into turns at full throttle, and it would just stay flat. In the past the MERV would lift the inner rear tire like a dog taking a pee at even moderate speeds. Not anymore - it feels like I'm driving a totally different truck. I can only imagine what it would be like doing the rest of the recommended mods like putting in rocker bearings and better shock bodies & pistons.
If anyone is having trouble keeping their MERV shiny-side-up like I was, I really think its worth a couple of bucks an and hour of your time to try out this mod.
Here are a couple of closeups of the shocks and pre-tensions.
Black MERV springs up front:
Blue Summit springs in back: