What is the factory limited slip in HO 52's?

[special-K]

14-bolt axles can be used with about 3/4" taken off the ends. People do this to enable using 14-bolt differential parts, such as R&P that is not available new (I don't think) for HO52. Also, 14-bolts came in 3.73 and 3.42 ratios. I had a guy call me looking deperately for drums to get his '72 rollback inspected to meet the minimum fleet requirement of a contract he was going for. He needed that truck passed like yesterday. I pondered a minute and thought about the whole diff/axle swap, then people adapting 14-bolt disc brake kits to HO rears and told him to try backing plates out off a 14-bolt. The next day he called to thank me for the suggestion. He got that contract. That's common knowledge now, but I had never seen it done here or anywhere back then. The 14-bolt was the next corporate rear. Not as much changed from the HOs on the inside, mostly size and shape outside