I've purchased a Rancho tranny for one of my Syncros. Very pleased. No
issues, though I did not go through Bus Depot. They were prompt and
delivered as promised. Good tranny. Owned it and abused it for years
thereafter.
I've purchased a German Transaxle for my current Syncro. Same story.
I've never purchased from AA, but wouldn't hesitate.
It's a lot of money, so I understand the concern, but I would go to any of
the three, depending on money and logistics.
Miguel