Basin Lead trail leaves Basin Gap on Bald River/Holly Flats road and heads north to Tellico River where there used to be a footbridge but it got washed out so the trail isn't maintained much tho still follow-able.
This map shows Basin Lead trail heading north to Tellico River and the top red line is the old trail going to the washed out footbridge. The new option in red loops around to a forest road going to Miller Cemetery etc. The Gravelstand motorcycle trail in yellow doesn't really have a south trailhead unless it's the one I see going straight up the mountain side. Very steep.
Here's a pic of Basin Gap on Bald River road 126. Basin Lead trail is visible in upper right.
You can see Basin Lead trailpost in this pic. I've backpacked Basin Lead 20 years ago and then more recently backpacked it several hundred yards up and camped right on the trail.