To start drain and remove the radiator, remove the belts, the crank pulley, and then the balancer. You will need a tool to pull the balancer, there is a bolt in the center that you have to remove. After the balancer is removed you can then remove the seal, it's best that you use a tool for this also. after you have removed the old seal clean the area, and you are ready to install the new seal. There is a tool for this. I have used a large socket in a pinch but you run the risk of getting the seal in crooked. This is a shortened version on how to do this, it's not that hard, just take your time. Install is the reverse, torque the bolt on the balancer to I think 80 psi (someone correct me if I'm wrong)You can rent some of the tools at Auto Zone, or you can buy inexpensive tools at Harbor Freight. Search the forum I believe that there is a link to the factory manual.
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.