im running the 380 (albeit maybe slightly lower power as i have a .48) and have had no trouble at all, done about 15k with it at that power, done 30+ santa pod launches (anyone who's seen me launch will tell you, im not gentle) and it does get used, i dont abuse it but it does get driven properly.

3rd gear is the one to watch if its 4x4, dont build up the power from low rev's, my rule is dont boost 3rd gear unless its above 4k, seems to work for me.