The stock Traxxas diff ratio is 2.85:1 while the hybrids use buggy gears that are 3.31:1, so your truck will be slower in top speed and you will have to adjust the gearing to compensate with a bigger pinion and/or a smaller spur gear. Use BrianG's speed calculator to help figure out where you want to be.
http://scriptasylum.com/rc_speed/top_speed.html