Quote Originally Posted by myburb View Post
My understanding is with a 7060 in the early years they installed the reluctor at back of trans whether 2 or 4 wd and just plugged the rear speed sensor hole on 4wd and sent the transfer case output to b5 and b6. If it was 2wd the signal went to a drac and was then sent to b11.
This is correct according to the schematics, and a switch (in the schematic I posted for an early 7060 truck) would tell the PCM when the T-case is in low range so it would shift correctly. I've never seen a 4L80/205 combo out of a 91 square with 3 speed sensors, the couple I've seen had an extension harness to the VSS in the tailshaft of the transfer case.