Hi guys i have a question for yall. i recently bought my first tmaxx model 4909. I was looking around on it and noticed that i doesn't have the shift servo. which i didnt think was a big deal because i have tons of servos only need the arm and linkage lol b ut with further investigation i realised that the transmission has no pin for the linkage to hook into. So my question is..Did some of the 4909 models not have the shift servo since my model doesn't look to have had the OptiDrive option. This is my first tmaxx and I'm still learning about them. PLEASE HELP!!!