Hi DOUG iv been looking at your pics and the two rear plates are not original there would have been a chain tentioner each side of the axle that keeps the axle centres set with the sprocket bolted to the chassis rails then the spring shoes can both slide that is a better idea than with swinging shakels that are no good for chain drives as thay adjusts the centres. so you chassis should have adjsters on your axle probably removed when the drive train was removed also the G type should have flinch plates rivited to the insides of the chanel yours doesnt seem to have them and my hubs ar threaded yours has bolts to hold them on your one sertanly is intersting im still on the thinking its a probably a larger lorry or coach chassis. Do you know any history on the chassis??
DAN