Having had my bus for some time, I was alarmed by the development of a shudder when starting off. Harsh acceleration got rid of it but a slow take-off produced symptoms of a engine mounting failure, shaking from stem to stern, especially on an uphill slope.
The autobox was changing smoothly - fluid was red and unburnt & frequently changed, the kick down cable adjustment was per specification (The cable ferrule being 1mm from the end of the red boot-35mm from ferrule to housing on full throttle) but something was amiss.
The line pressure was to specification, no leaks and once the bus was moving a smooth as silk.
The problem seemed to be Kick-Down cable related, it appeared to be smooth in the cable sheath, no obvious fraying and visibly undamaged from autobox to throttle arm. Having played for many hours I concluded that the slack in the cable was ok to produce smooth running but as the ferrule was butted up to the cable housing the cable length between the auto valve body hidden behind the sump pan and the ferrule may be the cause of the vehicle shake.
By placing a metal spacer of 5mm in thickness( eventually I used a Biro pen spring cut to length and wound round the cable between the ferrule and the sheath) this appeared to solve the problem. Still keeping to the recommended overall cable adjustment as per workshop manual. To date after several thousand miles the box is performing as required with no shudder. WATCH THIS SPACE!
One of my engineer friends suggests that maybe the ferrule has slipped,or cable stretched, the extra adjustment in the valve body gives initial priority to the Torque Converter, shudder usually means insufficient fluid in the vanes. A cheap quick fix as opposed to Autobox removal and rebuild.