I and the truck mechanic installed the cusco today, there was no trouble what so ever!
I used the shimming in the original lsd on the cusco unit, fitted prefect.
After changing lsd i broke it in. Running in 8`s for 1 hour, clutch in when im turned in and cltuch out on straights.
Changed the diffoil after breaking it in, and have driven 150km after that..there is no clunking or scraping. The diff is really tight and predictable - i just love it! Its an new car!