The 6T also has plastic cases for the diffs and housings. Quite thick plastic I might add. Haven't seen any issues there as of yet and honestly don't expect to either. I have managed to slightly crack the rear shock tower due to bad landings while trying to do back flips on the track. This also caused 4 screws to bend. Nothing else has broken, bent or in any way deformed. It just keeps going and going. :)
Those 40 series has been working flawlessly. No bent dog bones or any other issue in the drive line. Using 5s and 4s :)
The servo is the 1256TG:
http://www.savoxusa.com/Savox_SC1256...avsc1256tg.htm I see the price tag fell out from my previous post. Amain has them for about $80.