@Spearfish, let me clarify. I didn't mean to just suck the old stuff out of the reservoir, refill leave it at that. I meant before flushing/bleeding, to eliminate as much of the old fluid as possible. Probably better for the line and CSC not to have all those contaminates flowing through the system. In fact, one of the install guides for the zspeed heavy duty csc suggests this too.
It would probably be cheap preventative maintenance to do the clutch, trans and rear end fluid annually (~12-15K miles).
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