I needed to call Lockwood on another issue so I asked about removing the Vac Pump. They said it is no problem taking the pump off and leaving the spline/gear in. If you have to open up the gear box for maintenance later you could remove the extra stuff at that time for weight savings. As Tommy stated in his post I am not trying to dispute anything, just reporting what I heard. I am still curious as to what the concerns might be with leaving the spline/gear in (the fellow at Lockwood couldn't come up with any).