there is no washer in the lst2 motor so you good there. as far as setup tip's keep your temp's between 220-250 and you'll be good.
make sure you locktite EVERY metal to metal screw on the driveline and check them often. i check mine everyday i run it. make sure your wheel nuts are tight. and what ever you do DON'T tinker with the radio settings i did and before i knew it i had it very very messed up. make sure you go through the book for the radio 2 or 3 times to get a handle on how it works. there is a guy on here called 2dmaxlst he is the man to ask about anything lst related.