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I believe the cast iron OD case is also large bearing retainer compatible and I have the largest diameter bearing support bellhousing, not sure what type yoke I have...any additional strength benefit in the cast iron side cover and tail housing?



All truck/van od's have a cast iron tail housing I haven't seen one with an Aluminum one. The side cover depends , I doubt you'll notice a difference in the side cover unless you are switching to the early ball/detent style .