  The standard model(SM) predicts only a $g_{V-A}$ coupling in $t \to W^+ b$
decay. However, if additional Lorentz structures exist, they can manifest
themselves in high energy processes such as this via non-SM values of the
helicity parameters describing $t \to W^+ b$. Plots and tables of the values of
these helicity parameters are obtained for various coupling strengths. Three
phase-type ambiguities are uncovered: $g_{V-A} + g_{S+P}$ with effective-mass
scale $\Lambda_{S+P} \sim -35 GeV, g_{V-A} + g_{f_M + f_E}$ with $\Lambda_{f_M
+ f_E} \sim 53 GeV$, and an arbitrary sign-flip in the $b_L$ amplitudes $A_{X}
(\lambda_b = - 1/2) = - A_{V-A} (\lambda_b = - 1/2)$. These ambiguities are
analyzed so that they might be partially resolved when experiments resume at
the Fermilab Tevatron.
