I suppose you are right, if the SAAC published it.
I suppose the 50 or more GT-350's, track and shop floor, and the few R's: were 1499 and down,
Tony his seen quadruple, same deal + his very rare GT-350 is all aluminum.
I do know in '68, '69 and '70 TRANS AM Fords ran the same 4 speed. Readily available and in all the cars.
No one ran anything cast iron, except Gurney one year with his AAR car and he complained about the 140 pound cast iron piece of Hemi over-kill.
I had a tunnel port and I still have the 2.43 all aluminun T-10M, Daytona model, that a 427 could not blow-up in Saddle River storage.
That's all aluminum as well or I would not have bought it from Holmon & Moody with the '68 Tunnel Port engine
Same deal with Holmon-Moody, he had them for sale as well as Bud Moore. Well into the '70's. They actually had another name for the T-10M.
I use it as G & G was very precise when ordering new gears or clusters.
Don't confuse the factory with Ford, never happened, sub-contracted. LA airport was the closest factory to Ford and T-10M
All the scrape aluminun and junked; from racing or amaeteur GT-350 owners pounding in the trans: were main case & tail housing aluminum T-10M's.
I saw dozens in both examples, broken main cases on the former and broken ears on the latter. Must have been 1499 and down?
Also G & G has been making a simple $10.00 part that helps T-10M and later series, Super T-10's survive, for 3 decades. Nascar has them installed. SAAC should add a few words and link.
Cast iron T-10's are another story, very weak, I'd be looking at 1st, 2nd, 3rd and 4th gear in your car for the 9510 alloy or expect the worst, when you least expect it.
Trailer queens exempted or buy Paul's for 7.8K or mine for 20K, Tunnel Port is free.
rick
SSC
SCJ
L-78 SS Camaro - slow ones