i purchased a xtm .18 pro engine and i cant fit it on my t-maxx

which style tmaxx? 2.5 or old?

Dude that should be a direct drop in.
You may need a clutch setup but that will fit in a Maxx.
There is no difference in the chassis for the 2.5 and original 15 as far a mounting goes.
I believe the 2.5 chassis is 3.2mm thick,and the original 15 chassis is 2.5mm thick.
BONEz'

k thanx but i dont know how to get the bell clutch on the crankshaft