Quote:
Originally Posted by 18436572GMC
If the rear end looks like that it is either an eaton ho52 or ho72. The only difference is the ho72 has a preload bolt on the opposite side near the driveshaft yoke. They came with 4.11 and lower
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Close -- HO72 was one-ton (30-series) trucks only, and always had the preload bolt.
3/4T (20-series) trucks had HO52, some had preload bolts and some did not.