Substitute these values

$$\begin{gathered} {\mathrm{T}}_1=1,003.8 \mathrm{N}-\mathrm{m} \\ {\mathrm{T}}_2=1,076.0 \mathrm{N}-\mathrm{m} \end{gathered}$$

into the equilibrium equation

$\mathrm{T}={\mathrm{T}}_1-{\mathrm{T}}_2$

to determine the external torque that can be applied to the composite shaft.