Umm, mine adjusts the other way I think. It is supposed to have about 3/4" of slop at the top, then it grabs. If the clutch engages high with the slack at the top, it is worn out usually.
To get the slack up top, I loosen my linkage, not extend it.
The set of the body tub does affect the linkage also. When I knock my tub off it's mounts a bit, I notice it in the clutch pedal. The frame mount should be flush with the firewall.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10. Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com
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