I am working from memory
and don't recall all the details
but I am pretty sure that
Bill Kondolay (of Diesel Trans in Canada)

http://www.dieseltrans.com/phpBB/index.php

several years ago ran some experiments
on 47R automatics
comparing
Mobil One Syn motor oil (can't remember viscosity)
against
Chrysler ATF+ (can't remember whether +2 or +3)

I have a vague memory that it initially looked promising for Mobil One Syn motor oil but did not work out well in the long run

Many years ago I had a good & imformative telephone conversation with an engineer at Universal Lubricants, the makers of the 'Red Bottle' and 'Black Bottle' trans additives about what alternatives would be superior to ATF+2, and this UL engineer seemed confident that Black Bottle additive plus Mobil One Syn ATF was at least as good as +3

Chrysler & Lubrizol laid out the
ATF+4 (Type 9602)
technical story in a 14 page SAE document (paper# 982674)