It's been quite some time without one.
I don't recall anybody on this forum doing the transmission fluid test, but I run into a guy who did it on his Ford Truck. The truck has over 200k miles.
Truck owner sounds unreasonable. His Truck had 200,000 Miles on it.
Brings it to AAMCO, and probably requested the $50 Tranny Oil Change.
Then complained it's not good enough. Just like Motor Oil changes, there are basic oil changes and a more detailed one.
Arguing with AAMCO doesn't solve anything. For a few hundred dollars, they could do a Full Fluid exchange using that $30,000 Machine they have.
But your not going to get the Full Fluid exchange with a $50 coupon.
For me? I did a Tranny Oil Change, new filter, new gasket, new oil and it was good enough. I did not do a full Tranny Oil Change and I KNEW THAT.
Go to Jiffy Lube/WalMart for a $25.00 Oil change and that's what you get.
Go to AAMCO for a $50.00 oil change and that's what you should get.