That makes sense. I guess it is because when I look for a used motor I do not look for a motor and trans together as a package. Either way the trans would be rebuilt so I just go straight to a remanufactured trans, often a Monster trans. I've had good luck with them over the years. I also...
4L65E GM fixed the issues with the 4l60E Improved sun shield, 5 planetary gears rather than 4 along with other up grades
Odd that it seems to never get mentioned