Speaking of Chevys, many years Dodge trucks used Saginaw (GM) power steering pumps, the same units used by Chevy/GMC trucks of the same years.

Chevy/GMC 4x4s have used New Process/New Venture Gear transfer cases (Chrysler) for many years. In the '70s, all the Big 3 (including Ford) used the NP203 full time t-case in the same years (75-79)
Although, the same basic internals but not the exact same unit, as they are married to the transmission and specific each to Dodge, GM and Ford. Ford used an opposite side case, too, with the front driveshaft on the driver's side, whereas Dodge and GM used cases with the front shaft on the passenger side. Front driveshafts interchange between Chevy and Dodge in those years. Front axles interchange, but are not the same, as they use different brakes, hubs and bearings.

JS