What Differential Do You Have in Your 1965 Barracuda?

Going by the casting numbers, IMO, the 741 and 742 third members both started around 1960 plus or minus a year or two. Which one the car got was mostly dependent on how much horsepower the car was going to have and/or if it had a tow package or some other heavy duty use. As for when it was first available from the factory in an A-body, I still haven't seen a documented '65 model with one. I have an early '66 (8/17/65) with a 273/4 and a 4 speed with one, but, I've seen other '66's with the same drivetrain and a factory 7 1/4 sure grip too.