I have US Gear 3.90s in my TA. I love them and so far they are quiet. I only have a few miles on them though. I also haven't done any events with the gears. However, it's a big difference compared to the 3.42s and I'm very happy at this point with them.
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Trey
Current rides: 2000 BMW 540i/6 and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
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