In manual 26703 for Taurus 2005-2014, the recommended fluid for the transfer case in AWD cars, also known as the PTU (power transfer unit), is Mercon LV. Every other description on YouTube, and forums state it’s 75w140 differential lube. If one were to use Chiltons recommendation, you’d destroy the $1000 unit. Is there a database of updates to errors in Chilton manuals?
The manual you reference is published by another company, check the title page of the book for their contact information.
We cover the Ford Taurus online for each year individually and have the following Ford service manual specification for the the PTU fluid:
As an example of our coverage, here is a link to the outline for our online manual for the 2012 Ford Taurus at ChiltonDIY.com. Click or tap the headings to reveal the subheadings: