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MadVan is the guru on trans around here. I'm just guessing but if its staying unlocked until about 35mph then locks and stays locked I would think your OK. On mine the lock occures between the 3rd and 4th gear shifts. If its slipping alot then your oil will get hot, that's about all I know.
I dont think that mine is giving me a problem, the temp is fine the shifts are fine. I just got to thinking about it yesterday when I had a load on, I suppose you always want more performance, but it gets the job done the GVCW was 34620
Part of it is that I just only know enough to be dangerous when it comes to the inside of the trans