Didn't the 72 also come with the 12 bolt Dana axle? Be certain he has the 10 bolt. Also, the ratio is stamped on the ring gear. Your differential is identified as a HO52/72. Went from 47-72. When you make the swap I recommend a new pinion seal with a reddi-sleeve. IIRC you will need to use the trunnion from your truck.
Last edited by Fred T; 12/16/2018 4:37 AM.
