Leaking T case

[streetstar]

I am a 4wd newcomer and know very little about the equipment on an old rig like my Blazer (its an 88), but i do know it leaves little red spots on my driveway

When one of these is leaking , is it ever just an easy fix, or is it a remove it and go through it ordeal?

Being an amateur at these things - if it needs to be re-built to have new seals installed , i will probably refer that process to a shop- what is a decent ballpark price to replace the seals - worst case scenario?

Everything works fine though, its just messy and i am attempting to restore the old thing to "occasional daily driver" status, so things like this are nerve wracking