39's and a 350? Is this even a question.
with a 318 and 37's, I broke (if memory serves) 14 outers, 8 inners, probably 20+ ujoints, and at least 40 hubs in my 44. I paid the $$$ for alloys and the carnage stopped, but I was also very timid with the thing because I couldn't afford new shafts...