I have a 66 Suburban, and twice while at the Auto Parts store, they have asked me if I have a HO72 or HO52 Rear End. I have not been able to find any info to tell the differance, other than I have the 12 Bolt Truck Rear. Could you please briefly tell me the differance between the two, and which one is the 12 bolt?
Also, I have a 4:10 rear gear, and would like to go Higher (3:73, 3:55). In a car 12 Bolt, a 4 Series Carrier will handle 4 and 5 ratio's, and a 3 carrier will handle 3 series gears. Am I correct in saying, that in a truck 12 bolt, you can go as high as 3:73 with the 4 series carrier? Thank you for your help.
