RE: What Servo?
Well Derrick, if your pinions are thin then it sounds like ou will need one of my [link=http://www.rcuniverse.com/forum/m_5477827/anchors_7740888/mpage_5/key_/anchor/tm.htm#7740888]"Bell Buddies" Found Here!![/link] And for only $25 shipped you will pay for it the first time you change your pinions and not damages your clutchbell trying to remove the gears. PM and I will get you set up!!
EDIT ADDED BTW those JR servos are notorious for causing sytem wide glitching!! Thats why we dont use them for Rock Crawling. Get rid of it and your glitching will stop!!