Reply to "What oil to run in my ZF gearbox?"

Mike, check to see if Roger took out the redundant shifter interlock behind the shift-stick in the cabin. Its under a snap-ring retained plug (under the small rectangular upholstered piece on the console) and consists of a 2" long steel plug with a detent-tip & a spring. The ZF has a second detent inside the box and often the external one gums up so the two do not work in unison. Remove it & put it on a shelf with a cork in the hole, then try it this way. Other external things that slow shifting are partially seized shift-rod u-joints and a stuck or misaligned shift-shaft johnny-joint below the left header.