The problem was simple: the early GM 6.2L diesel did not have enough power density for real truck work, especially towing. With a heavy trailer behind it, grade performance was painfully slow and the truck was out of its element. We fixed that by turbocharging the engine. The result was a diesel that came alive, cleaned up the smoke, delivered better fuel economy, and finally had enough power to do the job. That 1982 turbo kit was the turning point. It proved a light-truck diesel could be made genuinely useful, and it became the starting point for the modern diesel performance aftermarket.
Gale Banks begins by describing nearly three decades spent focused on marine power. That work established the foundation for later diesel development, but the direction changed when diesel opportunities emerged. Around 1978, GM asked him to evaluate a new 6.2-liter V8 diesel intended for 1982 pickup trucks and to develop it as a marine engine with turbocharging.
His initial reaction was that the engine lacked power density. In his view, it did not make enough horsepower for its weight to satisfy the performance targets he wanted. Even so, the project became important because it led directly to turbocharging the 6.2-liter diesel for pickup-truck use rather than limiting the effort to marine applications.
Before the diesel aftermarket work took shape, Banks had already built a reputation through high-speed performance projects. In the late 1970s, his team improved the Bonneville record for a door-slammer street machine, reaching 217 mph with Geyser's Studebaker.
That credibility expanded through a Corvette project connected to Bob Kehoe and Duane McKinney. Kehoe owned a notably well-prepared Corvette, McKinney handled the paint and setup and drove it, and Banks installed one of his marine big-block engines, a 430-inch combination. The car used ice-water intercooling, and after a previous 200 to 201 mph record, it ran 240 mph. Tom Center later wrote about the car in Popular Hot Rodding under the name "240 Sporty." That article became a key link to Detroit.
The Corvette's 240 mph performance drew attention from Pontiac. Bob Dornan, Pontiac's chief engineer, and John Schinella, the chief stylist, contacted Banks after seeing the Popular Hot Rodding coverage. They told him Pontiac had a new Firebird coming for the 1982 model year and asked whether he wanted to go 20 mph faster than he had with the Corvette.
Banks was invited to the proving grounds, where Pontiac provided an early 1982 Firebird under strict secrecy. The car was to be transported in an enclosed trailer, kept under wraps, and returned discreetly. The plan was framed as a Hot Rod magazine-style project, with Leonard Emanuelson intended to drive it at Bonneville. Banks recalls this period as the moment when he realized Detroit engineers and stylists were not distant untouchable figures, but practical people working on ambitious projects much like his own team.
At roughly the same time, GMC gave Banks two pre-production 1982 pickups equipped with the new diesel. One was a one-ton dually rated at 145 horsepower. Banks immediately saw the mismatch between the truck's intended work and the engine's output, especially when towing a heavy trailer weighing roughly 8,500 to 9,000 pounds with a car loaded on it.
He describes towing over Baker Grade and watching the truck struggle so badly that the climb felt interminable. The truck slowed to about 6 mph, creating a serious drivability and safety problem when faster heavy trucks approached from behind on the grade. The issue was not subtle; it was a clear lack of usable power under load. That real-world towing experience made the need for a practical diesel performance solution obvious.
After returning from that trip, Banks and Bob Roub, who would remain with him for decades, went to work. Roub was young at the time, and the two of them spent six Saturdays in a room developing a turbo system for one of the diesel trucks. They then modified the second truck as well, including the lower-output 135-horsepower half-ton.
The results were transformative. The trucks came alive, the smoke went away, fuel economy improved, and they finally had enough power to do the jobs owners expected of them. Banks identifies this turbo kit for the 1982 GM 6.2 diesel as the seminal product that launched the entire diesel aftermarket. In his telling, that package started it all. It was not just an incremental upgrade; it established the template for diesel pickup performance as a commercial category.
When Banks brought the diesel concept to SEMA, the industry did not know what to do with it. Diesel performance was not yet a recognized segment, and he deliberately did not present it as a conventional diesel-engine exhibit. Instead, he brought it into a speed-equipment environment, where the idea of a diesel performance package was unfamiliar enough to feel disruptive.
That reaction underscores how early the project was. Today, diesel aftermarket performance is a well-established field, but at the time there was no accepted place for it in the mainstream performance world. Banks presents that moment as proof that the 1982 turbocharged GM diesel package was not following a trend; it was creating one.
Later in 1982, Banks developed the Sidewinder package for Ford's 6.9-liter diesel. He describes it as a dramatic improvement that fundamentally changed the engine's character. The Ford diesel became much more competitive, and over the following years the 6.9 gained enough market strength to outperform GM's 6.2 in the marketplace.
That shift had consequences inside GM. Banks says the diesel engine plant in Moraine, Ohio, fell to about 17 percent of capacity. The competitive pressure created by Ford's stronger diesel position helped open the door for a deeper collaboration between Banks and GMC.
Banks was then approached by John Rock, who was serving as general manager of GMC, to create a formal arrangement. The result was a dealer-specified option that allowed customers to buy a turbocharged pickup truck through any GMC dealer in the United States. When the hood was opened, the engine bay identified the package with the Banks name.
This program arrived in 1988, which Banks notes was a year before the Dodge Cummins pickup appeared in late 1989. In other words, a nationally available dealer-channel turbo diesel pickup associated with Banks and GMC was already in place before the Cummins-powered Dodge entered the market. That timing matters because it places Banks' work at the front edge of factory-adjacent diesel pickup performance, not as a response to later competitors.
Banks closes by placing the diesel truck work in the context of a much broader set of OEM relationships. He mentions another GM-related project that eventually became associated with the Cyclone, and he notes that in 1981 his team built the prototype for what became the Buick Grand National. He also says Banks had previously helped Buick turbocharge its first turbo car, the 1976 Indy pace car, when Buick had not yet figured out how to execute the system on its own.
Those examples illustrate that the company's ties extended across GM, Ford, Mopar, and Jeep. The relationships were deep and technically significant, spanning diesel trucks, Bonneville efforts, and landmark turbocharged performance cars. Banks' conclusion is that these manufacturers were not mythical institutions staffed by unreachable figures. They were groups of engineers and builders, much like his own team, working through difficult technical problems and looking for practical solutions.