When you upgrade the strg servo, you need to upgrade the servo saver as well. The servo saver for a MG servo is also diff than one for a plastic geared servo. I use this Kimbrough saver on my Tmaxxes that run Hitec 5645MG servos for strg -
http://www3.towerhobbies.com/cgi-bin...&I=LXS361&P=ML