help choosing a motor

[RUSTED]

yes , it aint that bad , good thing i already have the diffs , bought an old but in really good shape ofna titan roller for 20-25$ from the lhs , i bought it to take its suspension and put it in the maxx but after reading about the titan i discovered that it had 1/8 diffs

btw does the mmm's fan operate when their is overheating or is it on all the time ??? , cause mine is never on , and how can i cover the open areas in the medusa motor , is covering it by tape ok ???


thanks