Generally what vehicle is the biggest pain for you to work on? Why?

Chevy CUCVs - there are parts systems in chevys that you have to take apart with a torque wrench because the torque requirement to put it back together is the torque that it broke free plus 5 lbs. So if you took apart the diffs with an impact and then went to look for torque specs to put it back together - there aren't any - ANYWHERE!!

I mean, have you ever tried to rotate the tires on a 1943 Midway-Class aircraft carrier? You can't believe the size of that torque wrench!!!

Any of the new ones today. They are made so you have to go to the dealer or certified mech and cost you $$$$$$$$$$$$$$$$$$.