Rear diff question

If the rear has a cover, count the bolts that retain the cover.
IF there are no bolts holding on a rear cover, then you have an 8-3/4 rear where the gears are installed into the rear housing from the front and nuts onto studs hold it in the housing.
Match what you see to the chart.

http://www.forabodiesonly.com/mopar/showpost.php?p=1969905844&postcount=9