In addition to the lower axle ratio, while you're in there consider changing the differential to a limited slip model. I think your winters in the Netherlands get a lot more snow than Texas ever did, and the LSD will help keep you on the road and mobile.
With a lower axle ratio you might want to consider a new camshaft to move the torque peak further down the Rev range to complement the lower cruising revs.
Really interesting project.
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Lead or follow. Either is fine.
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