I'll be buying a '95 K2500 6.5TD Suburban soon & would like to convert to the NV4500, preferably the '92-'94(?) version with the 6.34 1st gear. Does anyone know where I can buy one at a good price? If not the 6.34 version, would it be possible to replace the 5.61 1st gear with the 6.34? Thnx in advance.