Broke rear drive shaft, drove out of trail then, at highway speeds for 80 miles. During drive every 15 miles or so made bad clunking sounds from front? Let cool down and would go 15 miles again until bad sound.

​​​​After replacing rear driveshaft all good in 2wd but in 4wd clunking comes back at high speed or under stress in 4 low.

Question is.... Replace front diff??? Transfer case??? What did I ruin?