T-5 Rear Seal install

If you're just replacing the seal where the driveshaft goes, you've done way more than you needed to. The seal installs from the outside, so once the driveshaft is out of the way, all you need to do is pry the old seal out, and tap the new seal in. If you've separated the tailshaft housing from the main gearbox, you're going to have to clean those mating surfaces and silicone them back up. If you haven't broken the seal between the tailshaft and main box (you didn't say anything about fluid leaking everywhere so maybe not) Throw the bolts back in it before you do anything else.