I have a BAFX device and use DashCommand Pro. I paid the extra money for 1997 PIDs, only because I have a '97 LeSabre as well, so I figured why not? I can read trans temps on DC with no issues.
I also have Torque Pro. I bought Pro because my idea was to use one app for one vehicle, and one for the other. DC gives me issues when I try to go from one vehicle to another. I could not figure out how to get trans temp readings on Torque Pro. I did try the two "methods" listed under the PIDs, but I couldn't get any readings. I then stumbled on a post on a different forum where people were posting their custom-value PIDs that they entered that let them see the trans temps. I tried a few of these, and couldn't get them to work either. For now, I just use Dashcommand. It works like a dream.