I think your leak is caused by sling directly on the shifter rod from the passenger side and likely some by fluid bouncing off the drives side/front. I find it hard to believe that fluid climbing the wall is your main contributor. The aluminum piece would likely be a permanent fix. Just make sure it has a little clearance on all sides rowing through the gears. I was thinking that you put the shroud on the bottom side of the shift shaft and shape it so it will still shroud while rowing gears. The rubber boot would work just as well with the chance of grinding up some rubber. I don't like the thought of that material getting in the bearings/races/synchros.
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Todd
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