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**dozerbill72** · 11-23-2015, 05:40 PM

On the drivers side of the pinion on the front if there is a bolt with a jam nut. the bolt would be pointing towards the drivers tire. It is a HO72 if it does not have that bolt and nut it's a HO52.

11-23-2015, 05:40 PM	#3
dozerbill72 Senior Member Join Date: Oct 2015 Location: Berryville Arkansas Posts: 402	Re: Need help identifying 1972 k20 rearend. On the drivers side of the pinion on the front if there is a bolt with a jam nut. the bolt would be pointing towards the drivers tire. It is a HO72 if it does not have that bolt and nut it's a HO52.