I was wondering what parts, if any, interchange between front and rear Dana 44s specifically 73-79 years. I have a few 73-79 D44 rears from F100s and Im going to junk the complete units if they dont have any substantial worthwile parts that would interchange with my 4 79 D44 fronts. Im talking parts like hogheads carriers and gears. Not useless parts like diff covers or bearings that I will replace anyway. Anything special I should keep?