My opinion is the Mamba Monster is gonna to be too much motor for the Pede. Plus I'm not 100% sure if the motor will fit...
ya there is enought room for both esc and motor but still its to much power specialy with all the weight at the rear your never going to keep the front on the ground
my sugestions are a castle creations mamba max pro esc with there 3800kv motor so far on 2s lipo i have geared it 31/83 with minimal heat issues(out side temps about -5 to -13)
summit /mustang /stampede-2s spc lipo
i asked because i can pickup a mamba monster setup for 200.
Oh and check out BaldyDaniels and Oaks trucks if you have a chance. They are running the Castle 2400kv and see what they had to do to get the sucker in check. Both thucks are heavy weights and highly modified. See if that is something you would want to get into. If you think that's somthing you can handle. You will need an extended chassis, an Anvil in the front, and a light trigger finger in hand.
Hope this helps ya.
Kinda overkill on mamba monster.... I would get the mamba max pro sct edition