Yes that is normal, that is because of different ring gear diameters.
Originally Posted by Kerndone
Manufacturers really don't do anything...it has to do with the size of the R&P. Different diffs have different sizes of ring gears and pinion heads and that comes through in the gear ratio. Anything within a 1% difference isn't anything to worry about (general rule of thumb).
'00 Sport. 5-speed, Detroit TrueTrac Dana 44 rear, Detroit TrueTrac front, 4.10's, 2" RE BB, OME shocks, 31" BFG MT, JKS Quicker Disco's, Borla
'99 Z28 M6, some goodies
'94 'Vette, A4 all stock