Tbh to build the car i dont think you need anything , as you mentioned the rear gearbox holders are a nice option to have but dont really weaken the car any if you dont upgrade , The servo saver crank is much the same i have never had a problem with the std one in nearly 2 years but others have, i would just build it as the kit and see what you think , you will need shock oil, diff oil does come in the kit but you may want some diffrent rates.
Andy
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