Tires: Speed rating, maximum speed capability, drivetrain components

Question
Hi Bret. I have a question and needed an expert opinion.
I have a 2003 Subaru Outback wagon with AWD. I'm using Goodyear Assurance TripleTreads - 225/60/16. One of my tires went bad and needed replaced. I read the owners manual and was surprised to see that significant tread depth differences could negatively impact drivetrain components. Since a brand new tire would have significantly more tread than my other tires (not quite half worn) I decided to find the same tire with with similar tread wear. I was really happy to find a tire dealer (used) with the same tire with the same amount of treadwear (within 1/32"). I bought the tire and had my mechanic install it for me. I told him it was "exactly the same tire". Well when I picked my car up the mechanic told me that the tires were different because the damaged tire was load/speed rated at 97H and my replacement tire is 97T. I overlooked this rating when seaching for a replacement tire - I focused on tire brand, model, size and tread depth. The mechanic had me sign a waiver.
I would be happy to buy a brand new replacement tire but this would have a lot more tread than my remaining three.
I did some research and found some conflicting information. It seems that most sources stress the important of not mixing speed ratings, but Goodyear's website mentions that speed rating only impacts the maximum speed capability of the tire. Quote: "In situations where tires having different top-speed ratings are mixed on a vehicle, the maximum speed certification is limited to the top-speed certification of the tire with the lowest speed rating."
                          and
"Speed ratings do not indicate how well a tire handles or corners. They certify the tire’s ability to withstand high speed."

I would never drive anywhere near either of these maximum speeds.

So my question is would you feel comfortable having this situation with your own car - from a powertrain and safety standpoint?

Thank you Brett, I really appreciate your time and attention.


Answer
Jeff,

 Your mechanic was exercising his right to "CHA" from a liability stand point.

Since the tires are very close in overall diameter you should not have a problem.  The statement about remaining below the speed rating of the lesser rating, T in your case, is applicable.

The 2nd G/Y statement is again "CYA"