Tenneco Inc. agreed to be acquired by affiliates of Apollo Global Management Inc., taking the auto parts supplier out of the public market after years of share declines and business upheaval.

The ongoing shortage of semiconductors along with scant availability of other parts and supplies are causing delays for trucking fleets, a recent survey found.

Shortages of technicians and drivers, and general economic growth topped the list of concerns in the aftermarket sector, an industry analyst said Jan. 26.

GRAPEVINE, Texas — Fleets have found various ways to handle the need for parts: expanding inventory levels, not substituting cheaper but less reliable ones for critical parts, doing some warranty work themselves, keeping the average age of trucks low or turning to electric trucks.

Dealerships and fleets are changing stocking patterns for replacement parts and adding inventory as they work to minimize truck downtime amid widespread shortages of some truck parts.

Equipment and component manufacturers in the trucking industry are looking to expand their online presence and also see potential in 3D printing, both of which could help them reach more customers, they said.

A growing economy and strong new truck sales have increased demand for aftermarket parts, creating supply chal­lenges. Truck manufacturers and component ­suppliers said they’re working to alleviate pressure on the industry by expanding offerings, ­improving distribution channels and using predictive forecasting tools to get ahead of demand.