The torque arm on an '87, John. The service manual calls for PN 9636067 or equivalent, but I can't see a reason for any particular type of sealer. The black stuff should work just fine I guess.
I was also going to use the black sealant on the rear differential cover. Will that do, or should I go back to the rack full of Permatex products and get something else? I couldn't believe how many different types of sealants/gasket makers there are nowadays; my head is still swimming after looking through a ton of sealants/gasket makers today! :crazy