Cooling: heat is what kills a drivetrain on a long climb
Nothing punishes a truck like a long grade with a trailer behind it on a hot day. Engine coolant, transmission fluid and differential oil all climb together, and transmission temperature is usually the first to become a problem.
Intercoolers and charge pipes matter on anything boosted, because a turbo that ingests hot air makes less power and runs hotter still. Auxiliary coolers and better radiators buy margin on the sustained pulls where it counts. None of this shows up in a quarter-mile time; all of it shows up on the fourth mile of a climb.
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Most trucks have no factory gauge for transmission temperature, so the first thing worth buying is often a monitor rather than a cooler. Knowing the number tells you whether you have a problem at all.
Air-to-air and air-to-water intercoolers suit different uses, and more cooling capacity in front of the radiator can hurt engine temperature while helping charge temperature. It is a system, not a part. We stock 13 cooling parts from 3 brands.