Overrun is a sudden release of torque, such as hard on the throttle then jumping off. It is also stronger than a traction lock and should last a long time in a street toy. Best known by the GM name “posi-traction,” the limited slip (LSD) has been used by just about every manufacturer at some point. Auburn is probably the best known brand name associated with the cone style LSD and offers units for most of the popular axle systems. Notice the symmetrical angles on the spider gears, this is a 2-way differential. The most famous of the lockers is the Detroit Locker from Eaton. Built without using clutches, the new S-Trac is purely mechanical, designed to maximize traction and minimize wear and slippage. Replacing the clutches is not a big deal, but the break-in is. Some feature a bias plate that maintains a supply of torque to both wheels. Sep 1, 1997. The locker will free-wheel like an open diff until you hit the gas, applying torque, and the locker couples. As mentioned, most Mustangs come equipped with a limited-slip differential from the factory. The differential is a device that splits the engine torque two ways, allowing each wheel to spin at a different speed so that the car can make turns. When Richmond Gear introduced the Powertrax Lock-Right drop-in, they were quite noisy due to the design of the ratcheting action. So instead of firing up the ol’ MIG and welding those spiders, try swapping out that peg-leg for a real performance differential. The harsh realities of a locker require the driver to either adapt their driving style or simply live with erratic handling. The vehicle itself also makes a difference; short-wheelbase and lightweight vehicles are more susceptible. This is how they work—as the spider gears climb each other as the side gears react with the spider gears, pressure is put on the clutches, which couple the axles together. Re: opinions on best differential for street/strip daily driver..... « Reply #10 on: August 19, 2010, 09:45:53 pm » Quote from: smitty331 on August 18, 2010, 02:55:43 pm How To Select Proper Rear-End / Differential Gear Ratio A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). As you accelerate out of a corner, the awkward handling rears its head. This can cause some unsettling handling issues, such as a sideways jerk as the locker engages. Build your own custom newsletter with the content you love from OneDirt, directly to your inbox, absolutely FREE! The locker’s sketchy handling can make them annoying on the street, but perfect for the strip. A 1-way LSD is the quietest, with smooth, noise-free operation. See all 15 photos. With leaf springs, the differential is able to rotate a small amount as the springs react, and this changes the pinion angle. Over the years, they have improved on their design, reducing the noise and chatter. Good street performance or 1/8 or1/4 mile performance? Clutch-type LSDs are popular. The spool locks the axles together permanently, similar to the low-buck welded-spiders, but in a safe way. The primary reason for this popularity is its high torque carrying capability and resultant strength and durability. Spools are not the worst thing on the street, but they are pretty close. “This arguably makes it one of the most versatile traction modifying differentials ever invented. As the car becomes more powerful and modifications increase, the drop-in will become less reliable than a full-replacement locker. It’s basically bulletproof. Differential Preload. “It has the resources and the engineering and historical expertise of the world’s largest manufacturer of high performance differentials behind it. That leaves three. If it has a 12-bolt Chevy,it was swapped in there. On-command lockers are very popular with the 4×4 crowd, but they provide the best in terms of traction and drivability for a street-driven drag car. The Detroit Truetrac is going to be an excellent all-around differential that can handle the power you supply with your street car, and still manage to give you great driveability. We build a street/strip 8.8 rearend for Project Rehab, our Fox body Mustang with help from Motive Gear. © 2020 Power Automedia. A properly designed clutch system doesn’t have to make noise. Another caveat to the clutch LSD is the oil; all clutch LSDs require LSD gear oil. High Travel Springs In, Op/Ed: 2021 Chili Bowl Nationals – It’s All About Destiny This, 2020 Product Showcase: Koul Tools Nylon Fuel Line Assembly, 2020 Product Showcase: Total Seal’s New AP Plus Ring. Saxton tells us “The Eaton Truetrac (a helical gear type) provides smooth power delivery in poor traction situations making it an excellent choice for hauling heavy payloads and trailering. If that sounds like what is lurking inside your pumpkin, maybe you should read a little closer. But it was nice on the freeway. With more function comes more labor on the install side and more cost. While the locker itself is very durable, the overall strength can be hindered by the OEM carrier they are installed in. Last but certainly not least, you need to consider whether your vehicle will benefit more … In terms of straight line traction, the locker provides better coupling hands down, but going around corners will be noisy and unsettling. How the LSD reacts to overrun situations determines whether the LSD is a 1, 1.5, or 2 way; which is an important spec for a street car. Besides the tires, the rear differential is the last line of defense against slow 60-foot times and lost traction, but like transmissions, differentials are steeped in mystery and voodoo magic, or are they? If both sides have sloped ramps but are asymmetrical, it is a 1.5-way differential. The last piece of this puzzle is the idea of differential preload. Eaton’s True-Trac uses helical gears instead of clutches, so there absolutely no chatter. We spoke with Eaton’s test engineer, Jeff Saxton to get some details; he explained, “Both designs have been around for over 50 years and have evolved in terms of advanced materials for added strength & durability but the principles of operation remain essentially unchanged.”. Clutch-type differentials are what you commonly find in OEM applications. Eaton Limited Slip The Eaton Posi is an ideal way to gain additional traction in trucks that see mild off road use or need added traction due to performance enhancements. The one with a cover is the smaller rear, I think it's a 6.75 ring gear, the "smooth" differential is an 8 inch. The most rugged is the fabled “Detroit Locker.” It features a positive engagement mechanism and can transfer 100% of the torque equally between two wheels. So which is better, the LSD or the locker? While that sounds like a spool, and it is very similar, the locker also has the ability to unlock. If the vehicle modifications include increased engine output, higher than factory ratios, large wheels and tires or other added mass (body armor), a full locker will in almost every situation offer a more durable set-up than a drop in. With the different configurations (1, 1.5 and 2-way), there are enough options to allow you to get the right style for your application. Whether you are transforming your daily driver to a street/strip machine or want to improve your off-roader, Eaton has aftermarket differentials that are right for your application. We talked to Jeff Saxton at Eaton Performance Products who helped us compile the details and put them right here for you to decide. This can cause oversteer or understeer, depending on the suspension, speed, and the road itself. With these types of projects comes the need for quality products that can hold up to high horsepower uses as well as be comfortable when driving on the road. Each manufacturer has its own specific break-in procedures that must be followed in order to obtain optimum coupling. The shape of the ramp (or geometry of the tooth form) on the spider gears determines the LSD type. Curious what you guys with similar street cars are using as a differential. They are inexpensive and smooth on the street. Spools Strange Spools, in steel, forged aluminum and lightweight aluminum, are stronger and lighter than a differential. As one wheel loses traction, the gears spin, transferring power to the wheel that is gripping. Two degrees of pinion angle on a street car—regardless of the type of rear suspension being used, is the norm. To get around that, you could opt for an on-command locker, like the ELocker from Eaton. Recommended for street/strip applications. Street/Strip: 3.42-3.90 Gear Ratio; Race: 4.10-Up Gear Ratio; Your sales rep will be able to help you find the gear ratios and components you need, but you can also narrow down your choice using this Gear Ratio Calculator found at SummitRacing.com. These characteristics are even more pronounced in wet and snow/ice conditions. Each has their own pros and cons. This is an upgrade from the open diff, which would send the power to the slipping wheel, not exactly the best thing for a tidy launch off the line. Eaton has a new electronic locker, the ELocker. If left alone, the clutches with eventually wear away and there will be no coupling of the axles, although Saxton refutes, “This is not 100% the case and is entirely dependent on usage. Later on I tried a 2.26 gear that I scored but the 1000' drag strip was run in first gear only. A locker is more efficient and simply will not slip off the line like an LSD can. Modern differentials come in many flavors—open, limited slip, locking, and spool (which is not even a differential). For a beefed up, maintenance free rear end, perfect for your street and strip car, consider Moser Engineering’s Ultimate 9″ 31 Spline Axle and Differential Package. This makes them less reliable, but only because the stock carrier may fail, not because of the locker. Of course high strength axle shafts must also be considered with these types of modifications.”. We asked Saxton about choosing a drop-in over a full replacement carrier and he told us, “This always comes down to strength considerations. It is a common thread in performance circles; the rear differential gets forsaken for the glory of the engine and transmission. Check out the cool parts they sent, as well as our step-by-step overview of setting up an 8.8 at home. This eliminates the differentials main function of allowing one wheel to spin slower than the other when needed, specifically when turning. The car makes 520/500 at the wheels and is mostly street driven with trips to the strip about 2 times a month. The easiest way to tell between the 2 is if the back of the differential has a cover or if it's "smooth." the sale, use, or installation of this product may also be illegal nationwide under the federal clean air act (42 u.s.c. It is almost terrifying the breadth of Jefferson's technical abilities. It is also an excellent front axle application choice for a vehicle that is both a daily driver and a regular off-roader. Installing a drop-in locker can as little as an hour or so. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. On-command lockers are typically air, cable, or electric solenoid operated, which means you need to run wires and hoses to the rear end. Manual transmission cars show the most abrupt changes, as torque is applied, released and applied again at every shift, so there will be more clunking and banging. Style. Outside of heavy competition, an Eaton Posi commonly lasts as long as the owner wishes to keep it.”. When power output increases beyond the ability of an LSD, a full lock is needed. The Helical differential offers a smoother transition, along with a level of durability comparable to that of the locker. Hot Traction Tips For Street/Strip Suspensions. A properly designed clutch system doesn’t have to make noise – regardless of gear tooth type/geometry.”. Lockers can handle tons of horsepower into the 1,000-plus range, but most LSDs are maxed out by the time you hit 600 hp. If you would like a response to your feedback, please enter your email address below. In contrast, a speed-sensing differential responds to a speed difference across the differential device, and tries to balance the speed across the two wheels. A couple of us felt the scourge of limited slip differential envy. Build Your Truck or Jeep Your Way | FIND STORE. Instead of controlling slip like a clutch/cone system, the gears are actually torque multipliers. This style uses a simple electromagnetic field to lock the axles together when activated, but operates just like an open carrier when it’s is off, truly the best of both worlds. For street/strip applications a locking differential is preferred. *, We are dedicated to delivering a safe online shopping experience. M-W produces a wide range of axles for a variety of applications. Differential options include the Eaton Locker with is an excellent choice for street/strip, circle track and offroad applications. Thank you for your service! They perform the same task as a replacement carrier locker, but allow the user to simply replace the stock spider gears or limited slip clutches with a locker section. ... a street/strip car wont even make it blink. 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