A high-torque servo for the steering is a must . 
Besides a much more precise steering without having to rock the truck forth and back ,  
you can then also skip the sloppy servo-savers and use a very direct setup . 
the Hitec’s is a good choice , since they are also considerable cheap . 
You don’t have to go even bigger , like the much more expensive digital servos , 
( except you build some sort of a monster-truck , all a matter of tire-size and weight you have on the steerable axle ) 
A standard servo for steering is a no-no for me . 
Shifting and accessories , well , for that you can use standard servos , 
but even here I prefer better when standard quality servos .  
  
Willy 
CustomRCmodels
		 
		
		
		
		
		
		
		
		
	
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