You may not have damaged anything, the motor mesh may have moved. That's happened to me in the past. I have beaten the crap out of my truck & never had the transmission or diffs let go. They are still the stock LST2 stuff.
I don't think your battery is able to cope with the required amp draw. You should increase both the C rating & mAh/capacity of the pack.
Always have batteries that can deliver at least 20% more power than you require.
I use the Turnigy 6S 4000mAh 40C packs & they barely get warm.
As for 'calming things down' adjust the power setting lower in the ESC.
Spoon feeding people is not my idea of education. Do some research, Prof. Google is there for a reason.
Here are a few links which you should read before asking anymore questions. The first one is pretty good & has pics. The rest are just forums.
http://rctruckstop.com/2011/12/15/br...vs-sensorless/
http://www.rcgroups.com/forums/showthread.php?t=975447
http://www.rctech.net/forum/electric...ensorless.html
http://www.ultimaterc.com/forums/sho...d.php?t=140618
http://www.hobbytalk.com/bbs1/showthread.php?t=226007
Losi SCTE SC4 Pro 4000kv, Tekin RX8, 2S
MP7.5 Kanai III Tekno Neu 1515/2.5D 1700kv MM 4S
LST 2 Carbon CC 1717 1Y 1580kv MM 6S
Futaba 3PKS Spektrum Pro