It looks right- - - - -does the differential assembly bolt in from the front with a similar bolt circle? If so, it's probably the HO52 which is standard for 3/4 and 1 ton axles, with only a difference in the hubs and brakes. There should be an adjusting bolt and a locknut on the driver's side of the differential assembly which moves a thrust plate against the ring gear.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!