Diff U bolt torque spec

Yeah 45 is a really low torque value. You shouldn't be feeling like you're going to crush the axle tube. Sounds like it's time for a new torque wrench.
it's a pretty sweet low miles wrench. I've had it a long time. Maybe I'll calibrate against some of the others.

So you are yaaa or naaah for navy torque and medium (blue) lictite?