I have new Trance X-2 that has done this since the first ride. XT rear D and shifter with Sram 990 cassette. It downshifts to the larger cogs predictably, but the upshift is exactly the opposite. Sometimes it can take 3 or 4 complete pedal rotations to change or not change at all until I hit a bump. I tried over shifting then backing down to the gear and that doesn't work either. I snapped the original Shimano chain and the KMC now installed does the same thing. I suspect that the shifter cable is binding and not going slack immediately. The rear cable housing to the derailleur has quit a bend to it. Any ideas?