Peterbilt 379: History, Engines, and the Long-Hood Legacy

Replacing a Legend Without Losing the Formula

When Peterbilt retired the 359 in 1987, it didn't reinvent the conventional long-hood formula, it refined it. The 379 kept the same basic idea of a big aluminum hood over a big engine, sold in two lengths: a 119-inch BBC (bumper to back of cab) for fleets that wanted a tighter turning radius, and a stretched 127-inch BBC for owner-operators who wanted the longest nose Peterbilt offered. Buyers could spec it as a day cab or with one of Peterbilt's Unibilt integrated sleeper cabs, including the tall UltraCab roofline for drivers who wanted to stand up inside and lived in the truck as much as they drove it. For twenty years, from 1987 to 2007, it was Peterbilt's best-selling model and the flagship of the lineup, and it became the truck most owner-operators pictured when they imagined buying their own rig.

What Actually Changed From the 359

The two trucks share an obvious family resemblance, but they're easy to tell apart once you know what to look for. The 379 swapped the 359's round headlights for rectangular units and moved the turn signals up into the headlamp housing instead of leaving them on the fender. Peterbilt also enlarged the windshield and changed the wiper arrangement: 359 wipers sit at whatever angle they happened to stop in, while the 379's lie flat and match, facing the same direction the way a car's do. The hood grew a little wider to suit the bigger windshield and the larger engines coming down the line, and the cab picked up better HVAC and more sound deadening than the 359 ever had from the factory.

Engines Built for the Long Haul

Over its two-decade run, the 379 was offered with a rotating cast of the era's biggest diesels. Early trucks leaned on Caterpillar's 3406 and Cummins' N14, the workhorse combination through most of the 1990s, before Caterpillar's C11, C15, and C16, Cummins' ISX and flagship Signature 600, and Detroit Diesel's Series 60 took over as the model aged into the 2000s. A well-optioned late-model 379 with a 550-horsepower Cat C15 was a common combination by the early 2000s, and it's a big part of why the model kept its reputation as a driver's truck: enough power to actually enjoy the hood, and enough room under it to work on the engine without a shop lift.

The Last of the Long Hoods

By the time the 379 ended production in 2007, it still wore Peterbilt's aluminum hood, a detail that mattered to the drivers who spent twenty years defending the model against anything with a plastic or fiberglass front end. Peterbilt marked the occasion by badging the final 1,000 trucks off the line as the Legacy Class 379, dash plates numbered one through a thousand, a send-off that turned the last units into instant collector pieces the day they left the factory. The 389 picked up where it left off later that year, recognizable by its oval headlamp clusters and an even longer hood, but plenty of drivers will tell you the 379 was the last "real" one.

Owning One Today

Because it was in production for two decades and sold in huge numbers, the 379 is one of the easier classic Peterbilts to actually find and drive today. Parts are common, mechanics who know the drivetrains are common, and the used market ranges from tired day cabs bought to work, to show-quality customs with a small fortune in chrome and paint behind them. Sleeper-equipped highway trucks with the extended 127-inch hood tend to draw the most attention from buyers chasing the classic long-hood look, while shorter 119-inch day cabs are usually the more affordable, work-ready end of the market.

It remains one of the most customized Peterbilt models on the truck-show circuit, which says as much about its legacy as any spec sheet does. Between the two BBC lengths, the range of factory sleeper options, and two decades of engine choices, there's enough variation in surviving 379s that no two show-lot lineups ever look quite the same, even though every truck in them is unmistakably still a 379.