2003 Grizzly Shift Rod Adjustment Question

I would like to find out the correct length or method to set the shift adjustment rod. The repair manual stated to adjust its length for smooth shifting. There has to be more to it than that. I believe my quad is not fully engaging into the various gears which is causing clicking noises under low speed deceleration (engine braking), as well more noise and a sudden loss of power to all wheels while on the trail. The issue seams to be more prevalent when under loads like climbing hills and maneuvering thru rocky terrain. I will be inspecting the clutch system this weekend to rule out issues there. Any advise??