First, I don't think it's a derailleur issue. I already played around with the barrel adjuster at the shift lever, as well as the limit screws without success. The derailleur appears to be properly aligned.
I also swapped the inner and outer cables to try to resolve the issue, with no success.
I have a 3 speed front XTR shift lever. Small and middle rings work fine, but when trying to shift to the large ring, the lever won't click the way it does for the middle ring. Seems like the lever needs to move a little more before it hits the point where it clicks.
When I remove the shift lever mechanism from the housing (cable loosened), I can get it to click, but when I put it back in the housing, it still won't click in the big ring position, whether there is tension in the cable or not.
Is there some way of adjusting the shift lever itself to control where it clicks?