Originally Posted by tabetha

There's no drain on the diff, simply top up with LSD 80/90 oil, it MUST be LSD oil though.
The box plug is a pig to get to on a 2wd with a after market exhaust, due to small space between exhaust and box that you have to reach over to get to 3/8" square fill plug, the drain plug is easy as at the bottom.
tabetha