The torques published by bolt manufacturers are the maximum torques required to avoid exceeding the yield point.
The torques indicated by manufacturers correspond to the tightening force with which they intend to hold their assembly.
As LeMans850i points out, they take into account the material into which the bolts or studs are screwed. They also take into account the forces that will be exerted by the assembly and therefore add to the tightening force. The sum of these forces must remain below the yield point, except for special assemblies where this limit is deliberately exceeded to reach the consolidation zone, and for which the bolts are not reusable and must be replaced each time they are disassembled.
The ZF assembly studs with the clutch housing are 10 x 150 mm bolts, therefore slightly larger than 3/8". In Panterapat's table it is recommended 33 ft-lbs for grade 8, so it is consistent with the 37 ft-lbs that I indicated.