Hmmm Nomad, you are probably turning bolts of not less than 18mm shank, Big old trucks, likely you are not getting them too tight, maybe not tight enough, Trent, I could argue this with you forever in OFF Topic area, I realize Having been both a Mechanic, and Machinist, engineers are a little over the top with specifications, but there really is some good science used to calculate torque specs. especially in failure prone areas like connecting rod bolts, main bearing bolts, carrier bolts, etc . . .