Ooooohh Dang! Maybe I'm NOT losing my mind. ( 'course,, THAT wouldn't take long , anyway ) Just clicked this link from another post. Scroll down to the last entry -- Type 6-B Transfer case. It appears that the speedo drive is, in fact, electrical and not mechanical. If ya look at the entry just above that, Type 6-A, it lists a mechanical drive cable. Evidently, Toyota switched sometime around 91-92 and started installing electrical senders for the speedo.


http://www.marlincrawler.com/tcaseinfo.html

Mike in AR