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Choosing a transfer case for a heavy duty truck, mining vehicle or fire fighting truck? Learn how to size torque, read speed and ratio, pick flanges and sensors.

Buying or replacing a 4x4 transfer case for an ARFF or fire truck? Learn what to check: torque, ratios, neutral gear, differential lock, mounting and Allison coupling.

Dual-speed shifting, differential lock, and live PTO — here's how a 6x6 transfer case actually works.

Installation, operation, maintenance schedule, and troubleshooting — everything you need to keep your vacuum blower running.

From compact vacuum units to flagship industrial trucks: here's how to pick the right vacuum blower capacity.

From rural trucks to flagship municipal engines: here's how to choose the right fire pump flow capacity for your fleet.

Why does the same fire pump have different flow ratings at different pressures? Here's the engineering behind it.

Fire pumps can be driven several different ways. Here's how PTO-driven, direct-drive, and split-shaft systems compare.

Most portable fire pumps rely on a priming system that can fail. Here's how Kozmaksan's patented alternative works.