Yes it is necessary to remove oil pan to get to the retaining clip that holds the shift shaft in, also I would recommend replacing that clip, sometimes you have a tendency to stretch it open to far and it looses some of it's holding power which would alow shift shaft to be pushed out of position when re installing shift linkage (ask me why I'm suggesting this). As far as if it's better would know, I run an air shifter and drag race only. I would do the mod though every little bit helps.
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