This video shows how to replace a leaking transmission output shaft seal on a 1997 Honda Civic, but should also work for Civic manufactured during 1996-2000.
You will also learn how to replace a drive axle, because it is taken out when the seal is replaced. Remember you do not have to take the rubber boot off, it was easier for me to so I was able to get a good grip. Also, make sure when installing the seal it is flush with the transmission case, you do not want to force it and push it back too far or it will be ruined by other moving parts inside the transmission. I received estimates from 3 different transmission shops to do this transmission seal replacement ranging from $120-$170. The seal only cost $16, and it took my 1 hour to replace. Tools Needed: 17mm Socket 32mm Socket Seal Torque Wrench Screwdriver (flathead) Pliers Jack stand Car Used: 1997 Honda Civic EX Coupe 5 Speed Manual.