For those following, I have rebuilt the tranny, unfortunately, I am getting the same problem, reverse is failing, I did find the snap ring on the reverse clutch disengaged, so I thought it was only that. but, let me tell you tho, it took me a couple of days, to work on it, but it's really no big deal, I'm sure I can take it down, and rebuild again in less time next time.
not sure what else could be wrong tho, car isn't throwing any codes, will keep you updated.
thanks for the support !