Is all ATF +4 synthetic?

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Hey guys. This was inspired by bowtieguy's thread here: http://www.gassavers.org/showthread.php?t=12182

Instead of his question, I have a few minor concerns regarding the use of Valvoline's ATF +4 in my '99 Stratus.

http://www.valvoline.com/products/co...ssion-fluid/32

The Stratus has a 41TE transmission and probably came with ATF +3, I believe, but not sure. That is, unless all Stratus' models by that year were incorporating ATF +4, but I don't know what year that type of ATF came out?

I may have been the only person to service the transmission on this car(which was a filter change/fluid top off with "ATF+4", a store brand version at around 95k), so it at the very least has a marginal amount 'newer' ATF fluid and currently has over 100k on the majority of the ATF currently in the system.

I was thinking of using the Valvoline product. Amongst its claims is: Officially licensed and Chrysler approved.

Specs:

http://www.valvoline.com/pdf/Valvoline_ATFplus4.pdf

Thoughts of doing a 'mini' flush; simply allowing the cooler line to drain and add new fluid as needed until all is new fluid/have gone through the total number of Quarts called for, and that way replace all of the fluid myself for about $80(fluid, filter, gasket)?

I'm having some symptoms of RPM drop entering 4th gear and I'm suspecting the torque converter.

ADDED:

Found this http://www.centerforqa.com/