Is it a new emaxx, the 3905 with the dual servos? If so contact traxxa and say you only have a few runs on it and they will send new servos...
As for the dual vs single debate. I prefer a single high torque, and jr servos like the 9000t, 9100t, or 8711 are my favorite. That being said I do run a pair of 3050 futaba metal gear digital servos in my 3905 maxx and have no bad things to say about them. As long as you set them up right they will not fight each other, but that does take a bit of time and skill.
Anyone know if any of the futaba metal gear servo gears will fit inside of the traxxas servos? They use a futaba spline, so the internal gears must be similar... I have a waterproof 2075 that I want metal gears in for crawling...
Didn't Futaba make the servos for Traxxas?
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)
Pretty sure they did, I will have to take apart a metal gear futaba and see what will interchange. Metal gear sets are relatively cheap, as are 2070 traxxas servos. 125 oz/in is fine for a 1.9 crawler or steering on a basher buggy. Juice them up to 6.5+v with a ccbec and they will put out more