EMCO Gears: Bringing Motorsports Transmissions to the Street


Larry Bishop, director of motorsports for EMCO Gears, got his start rebuilding transmissions early on in his family run shop. “My grandfather was rebuilding transmissions and working on cars and my dad and uncle followed him into the business. I got my start working for my dad and then went to work for a Chevy dealer
briefly before getting into racing.” 

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After cutting his teeth working at his family’s shop, Bishop landed a job working in motorsports as a transmission builder. He built EMCO gearboxes for an IndyCar/Indy Racing League (IRL) team. Many of the teams were having issues with their gearboxes at that time, and he was one of the few who didn’t have problems with them, so the EMCO folks reached out to see what he was doing, and shortly after they offered him a job.

The first complete transmission that EMCO built was in the late ‘90s for the IRL before Bishop arrived on the job. “It was an oval-only gearbox that just had a spool in it,” said Bishop. “Then, not long after, we built the transmission for the Daytona Prototypes and that was because Jim France (son of NASCAR founder Bill France) was directly involved with it. He came to us because he wanted an American-made transmission in his Grand-Am sports car series.”

While the IRL program was short-lived due to the series merging with Champcar, the road racing program was just kicking into gear for EMCO.

“The IRL transmission was about a four-year program, and then we got into road racing, and we’ve been doing primarily road racing transmissions and transaxles ever since. Currently, we’re heavily involved in the Trans-Am series.”

Bishop notes that the Trans-Am car, sanctioned by SCCA Pro Racing, is one of the few classes where the rules are open, and the components are not “spec” to cap costs. “It is considered the Wild West. There aren’t many racing series out there like that anymore. The cars have 850 horsepower, pushing 900. They make huge torque and rev up to 8,600 rpm. We build a sequential gearbox that is limited to five speeds per the rules.”

EMCO Gear has focused on the Trans-Am gearbox and developed a solution for a no-lift-shift and a throttle-blipper for downshifting. They use a load cell sensor calibrated in tension and compression to activate a relay box, which then sends a signal to the MSD box.

Bishop says they came along at the right time because many teams were struggling with their old Hewland H-pattern boxes. “We made it a direct replacement for the Hewland gearbox and then it took off and went really well.”

The EEG5S sequential is more compact than the Hewland and uses a setback adapter, so it sits more toward the center of the car. “That’s the way the cars are designed, and they want to move the weight further back anyway. What’s unique about this gearbox is that the gears lay side-by-side. They’re not straight up and down like you find in a four-speed and it’s offset to the right.”

According to Bishop, the first couple of races revealed that customers had to pull the engine to change a clutch. “That was how these cars are designed, so we have developed an updated version with the clutch in front of the transmission. It’s one of our most recent developments. We are testing it in a vintage car right now but will be ready for the TA cars next year.”

With racing, the rules are constantly in flux. The Grand-Am series morphed into United States Sports Cars, and then it merged with the American Le Mans series a few years back. The rules were re-written to favor the European manufacturers, which is where most competitors are for EMCO. The company has focused on the Trans-Am gearbox and developed a solution for a no-lift-shift and a throttle-blipper for downshifting.

“That’s about as high-tech as those cars get. They’ve still got huge tires, huge brakes, big horsepower and they weigh 2,400 lbs. But, the engines are still carbureted. They are essentially older NASCAR engines before they switched to EFI. The cars run two MSD ignition boxes that are programmed to drop the rpms about 1,500 rpm when the driver pulls back on the shift lever so they can shift without lifting [SWOL].”

Bishop says that they use a load cell sensor calibrated in tension and compression to activate a relay box, which then sends a signal to the MSD box. The two-step ignition box was originally designed for drag racing where you put your foot down on the clutch, and then you could plant your foot on the accelerator, and you could bounce off 4,000 rpm until you took your foot off the clutch or button.

In addition to the transmissions EMCO builds, they also do racing transaxles for a variety of racing applications.

With a standard H-pattern gearbox or even a sequential, that doesn’t have SWOL, the time between shifts and the rpm drop can be significant over a race distance. But with their system, it takes 45 to 50 milliseconds, Bishop says, which is a little slower than some of your high-tech paddle shift systems. “It makes a big difference in the lap times too, because your rpm drops are only what your gear splits are, so you’ve got a 1,500 rpm split from second to third, whereas manually the drop may be the same but the extra time before the driver shits and after adds about 4,000 rpm, which costs more time.”

While EMCO is mostly a motorsports and engineering company, they have also developed a 6-speed sequential transmission for some Corvette models – the Z06 and ZR1. EMCO’s CG46 is gaining some traction in Corvette circles for quick no-lift shifting like the TA box. The CG46 is designed for the front-engine, rear-wheel-drive Corvette and fits directly to the bell housing/torque tube. One of the fun things about this transmission is that it can be adapted to work with paddle shifters. 

Bishop also notes that they do some small-batch gear sets for people, with minimum runs of 10-20 pieces. EMCO gearboxes are currently used in a few other street applications including its 6-speed DV46 Dodge Viper sequential gearbox, which has roots in racing but made its way into many street applications. Additionally, the 6-speed EG46 sequential is being installed in some LS and Coyote street applications. 

They’ve also worked with a few Miata racers to build gear sets that are better quality with teeth that are ground on a million-dollar cutting machine. The finishing processes that EMCO uses ensure the gear sets can handle the abuse of a racing environment. Another import nameplate they’ve worked on is Lamborghini. Bishop says that they’ve built gear sets for certain Huracan and Aventador owners. What happens with these one-off jobs is either a group of guys like a car club or racers will get together to fund the small-run gear sets. It also makes sense for some vintage cars where there aren’t any other options, and you want to restore the transmission as much as possible. 

What’s unique about this gearbox is the gears lay side-by-side. They’re not straight up and down like you find in a four-speed and it’s offset to the right.

“Occasionally, someone will send us a part or a broken part that we will make for them,” Bishop recalls. “We’ve done them for Ferraris and Lamborghinis. We also did a pre-World War II IndyCar where we made them some gears. It’s not a long list because it’s not for everybody, but sometimes there’s just nothing in the world left and that’s where we can help. It’s small batches, and it’s expensive.”

EMCO has built transmissions for USAC Silver Crown Cars as well. The Sprint Cars for the big ovals needed to have a gearbox that was geared tall enough for 1-1/2-mile ovals but still have a gear to get out of the pits. “The USAC cars used a two-speed box. It was originally a support series for the IRL at their events. The Silver Crown cars were the long wheelbase sprint cars, which were considered the next step below Indy cars back then. USAC wanted to do start doing some of the super speedways, the mile and a half tracks and the two mile tracks. And they used an in and out box. They were going to burn up the clutch because they had to run such a tall rear end gear…which is why they came to us. They wanted a pit gear and then a one-to-one gear. But they needed to be able to get out of the pits and get the thing rolling up to a decent speed first.”

When it makes sense to go the route of a custom gearset or complete internals is with vintage cars and high-end sports cars that have value or are rare. “It’s going to be worth repairing these transmissions to keep the components as factory-original as possible, original cases and things like that instead of dropping in a new one. We can do things like that.”

While EMCO is primarily a motorsports company, they are finding some niche markets for street applications as well. Who wouldn’t want a sequential gearbox that shifts without lifting off the throttle? Check out this cool YouTube video of a CG46 six-speed sequential in a Corvette going through the gears.





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