It all worked fine until the chain broke. Everything was worn, so I ended up replacing all drivetrain components except the RD. I have Shimano dual shift/disk levers and XTR RD. The problem is that now it shifts all 9 gears in 7 clicks, as if it was an 8 speed. The last click does nothing because the limits stops are set correctly. So it skips a gear in the middle. The cable shifts smoothly and the exact same amount for every shift. The RD moves the same amount for each shift, with or without the rear wheel on. It's like the shift lever decided to move the 8-speed gap distance, even though it still has 9 positions. The RD bracket is not cracked or moving. The RD is reasonably aligned, and no unusual play in the mechanism. I put the old cassette back on and it still does it. Can something bend in the RD that is not obvious but would change the distance it moves? Can something wear or break in the shift lever that would cause this? Or does the lever have some way of changing between 8- and 9-speed modes? I'd like to figure this out before throwing $$$ at it. Any ideas?
Stumpjumper Pro 120 2005
Shimano M765 dual levers and disk brakes
Raceface chainrings (new)
sram pg-980 11-34 cassette (new)
sram high-end chain (new)
Shimano cables and housings (new)
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