I don't know if the ABC motors are made by Mabuchi but you may want to search their website for a motor with the -180SZ designation. If it's on there, it'll tell you all the specs for that motor.
http://www.mabuchi-motor.co.jp/engli...uct/index.html
I don't know what the stock DTM SP pinion gear is but I'm using a 13T on my DRR. I'm still looking for larger one though. I'll let you know if I find anything.