Auto in the BT50 is 100% the same as Ranger. My neighbour owns a BT and last year I assisted him upgrading the transmission pan to a higher capacity version he purchased from US as he wasn't happy with the "sealed for life)" spiel they both advise for the box. The auto is made Nader license from ZF by Ford and designated the 6R80F for four wheel drive units and is used in the F150 and other models globally. Same box is used by the Mustang as well (6R80) in 2wd form.
I ran a an a scanguage on my previous PX S1 Ranger to monitor AT temps and it never alarmed me or went into limp mode etc. Like all autos you need to understand the S mode shift pattern change and t/c lock up to make sure you use them correctly. Plenty of videos on YouTube on the box. It is amazing to read how many people with LC200 don't understand this either (especially the torque converter lock up pattern in S mode)
Worse thing for them is to not change the oil at 80-10(0 thou as particles can effect the solonoid and lead set on early version transmissions. Other than that I have only seen some torque converter drive plate issues on a few Ranger forums I am on.