  Limits on gravitational smearing from the dominant dimension 5 operator (with
strength characterised by $cM/2M_{Planck}$) are obtained using the LEP data in
supersymmetric SU(5) grand unification. Effects of c on the quasi infrared
fixed point solutio ns of $m_b/m_{\tau}$ unification are also analysed. It is
found that $c>0$ softens and $c<0$ stiffens the fixed point constraint. The
effect of c on the upper bound of the Higgs triplet mass is analysed and the
existence of a scaling induced by c is discussed. Tests for the existence of
gravitational smearing are discussed.
