if it really has an LSD centre in it that was a very nice score! thats even cheap for a non LSD diff, if complete!

about the $600-$700 mark to get it done if you take it to a diff place and give them an old diff to copy measurements from. that'll have the housing cut down, the axles shortened and resplined and the mountings to the leaves put in place. might also be an idea to get them to push new bearings on the axles and check out the condition of the LSD centre too.