The lower first gear on the 200-4R already has a nice overall ratio with the 3.55.
Another thing to consider is that that while the engine is operating at a lower RPM, the 3.90 or 4.11 pinion gears will be hauling at higher cruising speeds. Going to be a lot of heat generated in the pumpkin on extended runs, and even if the rearend is quiet at first, I wonder if there might be accelerated wear? I would be inclined to stop at the 3.73 ratio.
I've had pretty good results with Yukon, mixed results with U.S. Gear, and bad results with the no-name ebay units that we tried.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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