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I've got 100,000 miles on myoriginalT-45 with a Steeda Triax shifter and a Centerforce dual friction clutch and it still shifts like a hot knife through butter.
My stock shifter was super smooth but I went with a B&M sport shift for less arm movement...lol. After I changed the shifter and put in Synthetic fluid and it wanted to grind in 2nd if I shifted fast. I changed the synthetic out and went conventional and no grinding? You might have the same problem. I don't think the T45's like synthetic for some reason!