Correlated ab initio calculations are reported, which show that stretching one of the Si-H bonds in silane from its equilibrium value increases the one-bond coupling J(Si, H) of the other three bonds by more than the increase of that of the stretched bond. This "unexpected differential sensitivity" in silane is considerably greater in terms of reduced coupling constants than the same effect discovered previously in methane. This UDS effect is also found to occur in the BH4- and NH4+ ions and comes overwhelmingly from the Fermi contact term. For the proton-proton coupling UDS due to the stretch of a single bond, also found earlier in methane, occurs in NH4+, just fails to appear in silane and is absent in BH4-. The origins of UDS and the signs of the coupling constant derivatives are discussed.