A50 has no J1850 capabilities afaik. a takeout A40 (with appropriate programming) will work, people used to swap them over to tune before A50 support was available. for a *new* TCM, afaik MD guys are SOL with SPS. they are probably SOL with a typical Allison dealer too because their system has no GM cals anymore.
i have ways to set up the new controllers for MD guys, the point is it can't be done with SPS. these TCMs can be "converted" but that's not exactly an off-the-shelf OEM process for a typical guy out there with a bad TCM.
what i described is not necessarily an exhaustive or up to date state of affairs with SPS. i don't use it anymore. there were also cases when SPS bricked TCMs for no discernible reason whatsoever even with correct TCM HW selected. if you are not careful and flash the wrong TCM -- definitely brick, so at least don't do that. correct TCM -- eh, maybe still brick. the system sucks (not the TCM). recovery is impossible more often than not.
i agree that 2011 TCMs *seem* to fail disproportionately. i don't know why.
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