I like the xt 60 pull switch. I run the same. You be better off just putting a rod holding the Diff brakes open and just running your wheel brakes. That way you can benefit from mixing rear brake bias
what type of measurements are the servo`s? Cant find any details about the size i can use and what is recommended. Except that they need to be 25kg each minim. but some get sold and dont reach that.
Most any large scale servo will work, these are the hitec d845wp servos, can also use agfrc 78kg servos. Those are my 2 favorite servos to run in these larger cars for steering. The throttle and brake servos are just standard size, or 1/8 scale