What's the credibility on AAMCO transmissions?

Answer 1

In the early '70s, they were taken to court by several regulatory agencies and found guilty of a whole laundry list of deception.
They paid a BIG fine, and I THINK there were several who served some time.
As a direct result there were several sets of laws enacted that govern and regulate ALL automatic transmission shops (at least in California). So, they are under the magnifying glass, as it were.
Every shop is a franchise, and they are independent in that respect. But they Do have company guidelines that MUST be followed. The regulatory agencies pay very close attention to them even to this day.
That is not to say that there is no fault to be found. There can be at ANY shop
One of the DOWN sides of their operation is that they operate on a high volume basis. They make their money on volume, and they don't necessarily pay their techs all that well. Their techs are all most likely capable and acceptable, but may be trapped in a volume under-paying shop because they can't pull their freight in a production shop. This is by no means intended to paint all techs who work for volume shops as merely mediocre. There may be valid reasons for a well qualified tech to seek employment here.
They DO offer some valued services, and most likely are NOT deceptive. But beware of the "UPSELL".

Good Luck and Merry Christmas

Answer 2

Haven't heard any good only bad but they are a big franchise so it depends who runs the shop and their individual experience.