i have a 2003 dodge 1500 4x4 with a posi rearend, the truck was hit in the side and broke the left axle shaft, the small shop i took it to replaced the shaft but didnt want to put the pose assembly back together because of a liability issue (?), and told me to take it to a dodge dealer and have it fixed,,,, my question is, is it difficult to put this rear differential back together,,,, i heard they are real touchy and complicated? and ideas where i can find info on this rearend?