Dana 27 and Dana 30 with drum type axle assemblies use the same identical hubs. Dana 25 hubs require a slightly smaller bearing and slightly smaller inner seal than the later hubs. Either the early or later hub will fit onto either the early or the later spindles. The D25 spindle is identical to the D27 spindle. The D30 spindle has a larger knuckle index and also is machined to accept the D30 axle shaft bearing (caged needle rollers) otherwise they are identical.