Yucaipa's housing stock centers on 1978 as the median build year, which puts it almost exactly in line with the 1958-1996 range that covers the wider service area, but on the later side of that span. That one number matters more than it sounds like it should. A garage built in 1978 almost never has the torsion-spring, center-mounted hardware that became standard in the mid-1990s. It has an extension-spring system running along the horizontal tracks, side-mounted, often with the older style of safety cable or none at all.
That's different from what you'd find on a house finished in the early 1990s a few miles toward San Bernardino, where torsion setups start showing up more. It's also different from the oldest pockets in the broader area, where doors can be even further back in design. Yucaipa sits in a specific window: old enough that the extension-spring hardware is common, not so old that doors are falling outside what parts suppliers still carry. That's a narrow, useful fact when you're trying to figure out why a door is sagging on one side or why the opener strains every time it lifts.