You´ll probably be OK, but if your worried (I would be), check the temp with your fingure periodically. Might want to jack it up in front and turn the driveshaft and get a feel for it. Then periodically jack it up and give the driveshaft a spin. It would be best to check after a say 10 mile highway run.
I´m a fan of molybidilium (sp?), leaves a micro coating of black snot on the gears (not to be used with clutch type gear boxes). I usually dip the bearings in synthetic motor oil, grease, STP or Moly assembly lube, whichever is handy, before reassembly. And put a finger full of grease on all the seals (between the ring seal and the spring). I once melted a new set of axle outer bearing seals, my assumption the axle oil would migrate, before friction had a chance to act, was false. They were leaking again pretty quick.
I´ve never had any trouble with the bearing changes I´ve done, but have seen some other guys have serious problems. Had one guy, pull into the shop, with his freshly rebuilt front squealing. Put it up on the rack and tried to turn the drive shaft by hand, then with a 14 inch monkey wrench on the yoke, then with a 2 foot extension on the monkey wrench handle, finally got it to turn with my whole wieght (185) hanging from the 2 foot cheeter bar. Sure glad that wasn´t my diff.
If you do a lot of mudding, I´ve had pretty good luck spraying bio degradable chain saw oil (I buy it in 5 gallon drums), on the trouble spots. I´ve got a undercoating spray gun, with a plastic tubing extension to get inside the frame and in the axle housings. The time it takes to spray, you save double in cleanup. Getting the mud off while it´s still wet is also helpfull.
WARNING, oil in a vapor is explosive.
Another good trick, is if you do get it cleaned up well, a brushed on coating of boiled linseeds oil (after it dries), leaves almost a shiny varnish type coating on everything, that sheds mud pretty well. I try to get it really clean, at least a couple of times a year, so the salt doesn´t stay in the mud and start rot. Most undercoating is a waste of time, though I have found the stuff detailers spray on there motors to make them shine, works well for shedding mud. Toreson (Hinkle/Loc Tite) makes a undercoating primer, that also works well (reminds me of Shellac). Shellac, boiled linseed oil and bio degradable chain saw oil are environmentally friendly, why not?
I´ve packed a ring of grease soaked hemp rope in the end of the axle housing around the axle. Which worked well, when it stayed put, about 80% of the time. Kept the mud out and polished my axle a little. The bearing seals, for the old model T were grease soaked hemp or felt, later graphit impregnated cotton rope (low tech.).