I was able to fix my MBX5T somewhat to put my ACn22/30/2 in it. The steering still messed up from the crash due to lost signal. The smallest pinion I have is 14T and the spur is 49T. I will use my 2 3S 2200mAh packs in series and my Schulze 18.97. The motors Kv is 1770 and with 22.2v should give me a little over 39000rpm. I did a little test on carpet with my DPR and full throttle only showed bursts of 90A and with the 7XL using 4S 5000mAh lipos and my MGM 16016 in the truck I saw burst of over 150A and this was on asphalt. I will see if tomorrow I can run the truck and I'll post some data here and I might do a little video as well.
Here is a quick video of the MBX5T truggy w/ the Mega Acn22/30/2 (1770Kv), Schulze 18.97 and 2 3S 2200mAh lipos in series (22.2v). This truck was in a bad crash and some parts were bent. I was able to get them as straight as possible, but the motor mount still is a little bent and the pinion and spur doesn't align properly. Here is the video: http://www.youtube.com/v/EAtcnCTdjAI
Almost forgto to mention that the DPR for some reason didn't record the run. My daughter gets a little excided.