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What are your experiences and opinions on using aircraft/heli servos in cars? I've used JR .06 cyclic servos in the past with no problems. The reason I ask is I'm picking up a T4.2 and need a new servo but nothing really fits what I'm looking for in a high end "car" servo. These are what I have my eyes on.

JR
DS8717
DS8917HV

Futaba
BLS255HV

There's no difference unless you are talking about a specialty servo like a low profile aileron servo or a reverse servo, etc.. Anything like that should be clearly marked, though.