I have 4.11 gears with 275/60/15 tires in my Lemans. At 60 mph the tach shows around 3000 rpm. Plenty of power to the road but that rpm sustained is not good for an engine unless it's in really good condition. If I had known better at the time that I put them in I wouldn't have used them. I think 3:55 gears would work much better. Just my 2 cents.
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