Where are you positioning your shocks for the track and bashing (which holes)? Also, what weight are you running in the front and the back?
4x4 Slash PE
Do a search on this forum. I believe someone mention this previously, from what I remember, you'll need heavier springs to make up for the additional weight of the MM 2650.
"How fast was I going Officer?" Wow?
losi black 2.0 springs up front, losi blue 2.5 in the rear, 60wt oil on all corners.
Agree with wjmiller3.
Blue springs are 4.1 rate and fit snug but work well.