OM No. No. 13/9/2009-Estt (Pay-1) dated the 21 October, 2009 that consequent upon implementation of the revised pay structure comprising grade pays and running Pay Bands, w.e.f. 1.1.2006 in cases of appointment of Government servants to posts carrying lower Grade Pay under FR 15(a) on their own request, the pay in the pay band of the Government servant will be fixed at a stage equal to the pay in the pay band drawn by him prior to his appointment against the lower post. However, he will be granted grade pay of lower post. Further, in all cases, he will continue to draw his increments based on his pay in the pay band + grade pay (lower).
2) you would be granted only lower grade pay