in no particular order...
Welker Farms
TheSmokingTire
Might Car Mods
The Skid Factory
Petrolicious
South Main Auto Repair
Jay Leno's Garage
Fuzzy Dice Projects
Finnegan's Garage
A couple of other channels I've been watching lately but not subscribed to...
BusGreaseMonkey
Bruce Wilson - watching the 78 International cab-over resto
Rebecca Vocal Athlete
Chiropractic Medicine
Mondragon Chiropractic
MIT OpenCourseWare
Steve Lehto
MotorWeek - watching retro reviews
Benny's Custom Works
Ron Pratt
Harry's Garage
Ronald Finger