Castro Valley's median house went up in 1966, and across this stretch of the service area the stock runs mostly 1960s-70s builds. That matters for a new install because almost nothing on these garages has been touched since the builder walked off the lot. The track is the track that shipped with the house. The spring is the original torsion spring, or a straight replacement nobody measured correctly in 1985. When a homeowner calls about a new door, what we're usually looking at underneath is 55-plus-year-old hardware holding up a panel that's already failed.
That's the piece that gets skipped when people shop a new door on price alone. You're not swapping one component, you're very often replacing an entire system that was never designed to meet current spring cycle counts or opener safety standards. A new door bolted onto an old track and an old spring is a short-term fix dressed up as a long-term one. If the track is bowed or the jamb has shifted with the house over sixty years, that gets addressed before the new door goes in, not after.