first of all you need to tear the diff apart, because it is not very well lubricated from the factory.
personally i starts by sanding the diff plates with 1000grit sand paper, on both sites.
then i use associated blackgrease for the trustbearing. and then asamble the trust and cone washers and put them in the diff and insert the c-clip that holds this parts in place.
the apply a little bit af diff grease between the outdrive and the diff plate to hold the diffplate in place and to make sure it not moving under action (i use RGP the same as the TRF team uses) the apply some on the other site of the diffplates.
then install the bearings and put the pulley on the diffoutdrive where the bearing is sticking out, apply some grease in the holes where the diffballs is going to be and the install the diffballs and apply a little diffgrease on the diffballs when they are installed.
then assamble the diff and tighten it to the settings you like. i like it fairly tight i use a diff tool that locks the to diff outdrives and then i holds around the pulley and try to make it turn. if it does i tighten the diff more but only a little and the try again untill i can't turn the pulley.
for the run in i install it in the car and put wheels on the car and the turn the car on and apply a little throttle and holds one wheel so the other wheel turns, i do this for about 30 sec. and then take the other wheel. i do this 2 or 3 times and the the diff is runned in. remember to check the diff setting every 2 or 3 run and se if the diff is still smooth.
in pro stock i rebuild after 12-15 runs and in mod i do it after 3-4 runs but i have build diff for some guys that have used it for 30+ runs and was still happy with it
buy some ceramic diff balls
hope it helps
CAR: Awsomatix A700L.
Nosram 7000 Batteries.
Nosram Comet HD ESC.
Nosram Pure 2 evolution Motor.