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20 Jan 2021

Where a limited slip diff changes how much torque is applied to each axle depending on traction, the locker sends the same power to both wheels all the time, under power. The car makes 520/500 at the wheels and is mostly street driven with trips to the strip about 2 times a month. Best known by the GM name “posi-traction,” the limited slip (LSD) has been used by just about every manufacturer at some point. A fabricator, master technician, engine builder, paint and body guy, dirt track racer, road course driver, or a glossy magazine reporter, Jefferson can do it all. Each manufacturer has its own specific break-in procedures that must be followed in order to obtain optimum coupling. For the purpose of this article, we’ll assume you are racing a leaf spring–equipped car. Locker and spool systems are ideally suited for racing and special applications, and in most cases, they can be unnecessary or dangerous for the street. However, there are likewise a trio of options in this category. Ask The Experts: Three Dirt Track Questions With FK Rod, Driving Tips: How To Execute A Proper Slide Job For The, Quicksilver’s Crate Engine Program: Past, Present, And The, Two-Time CRA Sprint Car Champion Bob Hogle, Longacre Racing Products Are Leaders In The Racing Technology, Why Mark Lowrey’s Chili Bowl Win Helped Crush A, Notebook: Georgia/Florida Speedweeks 2020, Devin Shiels: A Local Star That Keeps Quietly Winning, Rodeo Chrysler-Dodge-Jeep-Ram Returns as Pace Truck Sponsor, COMP Cams Super Dirt Series Releases 2021 Schedule, Speedway Motors Partners With Keyser’s Wild West Shootout, 61 Events Line 2021 Lucas Oil ASCS National Sprint Car Tour, Op/Ed: 2021 Chili Bowl Nationals – It’s All About Destiny This Time, It allows the driver to be in control of the wheel spin, the differential is engaged, and in terms of drifting, It keeps the wheels spinning throughout the drift. The last piece of this puzzle is the idea of differential preload. not intended for street use. Clutch style differentials which are ideal for performance street applications and can be rebuilt. 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. The differential is located between the two wheels, and is attached to each wheel by a half-shaft rotated through a bevel gear. Many muscle cars had them installed from the factory, so this makes them a great choice for a stock-style rearend build. Being a limited slip differential, it worked great on our wet back roads unlike true lockers and spools. The harsh realities of a locker require the driver to either adapt their driving style or simply live with erratic handling. Painting with broad strokes, a properly functioning Trac-Lok is the best compromise of street and performance driving. Within these two styles there are quite a few different options. The locker’s sketchy handling can make them annoying on the street, but perfect for the strip. Spools Strange Spools, in steel, forged aluminum and lightweight aluminum, are stronger and lighter than a differential. All rights reserved. If you would like a response to your feedback, please enter your email address below. Putting power to the pavement is more than just stomping on the go-pedal, there are complex mechanical events that happen between your foot and the tires. 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. For a moderately powered street/strip car, the LSD is likely to be the best bet, but as power increases, so does the need for traction. Originally developed for the H1 Hummer, this one is geared for the off-road but it may be just at home on the track. In street cars, ice can be a problem for the geared LSD due to the free-wheeling in no-traction situations. It is also an excellent front axle application choice for a vehicle that is both a daily driver and a regular off-roader. Official Release: This eliminates the differentials main function of allowing one wheel to spin slower than the other when needed, specifically when turning. To do this, the LSD uses either gears or friction clutches to allow the axles to spin at different rates. Open Differential: This is the common OEM configuration, which offers the best drivability, street performance, and value for non-performance street driving conditions. “This arguably makes it one of the most versatile traction modifying differentials ever invented. The most famous of the lockers is the Detroit Locker from Eaton. 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. Some feature a bias plate that maintains a supply of torque to both wheels. Each has their own pros and cons. Over the years, more racers have used and abused the Detroit Locker than any other locking differential, and that is saying something. 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. The easiest way to tell between the 2 is if the back of the differential has a cover or if it's "smooth." There are lots of options, I'm just trying to determine the best one for me. We build a street/strip 8.8 rearend for Project Rehab, our Fox body Mustang with help from Motive Gear. In this situation, applying light pressure to the brakes (or e-brake) will put enough load on the axle to force torque application. On-Command lockers offer the best of both a spool and an open carrier. Where the clutch-type LSD misses is in longevity. This can cause some unsettling handling issues, such as a sideways jerk as the locker engages. First introduced in 1941 as a OEM product and later for the aftermarket as the Detroit Locker, it is known for its strength and reliability. © 2020 Power Automedia. 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. They will certainly hold up better than a stock built TH350, but they are not a desirable trans. Instead of controlling slip like a clutch/cone system, the gears are actually torque multipliers. A locker is more efficient and simply will not slip off the line like an LSD can. Over the years, they have improved on their design, reducing the noise and chatter. According to Saxton, “Clutch compression is achieved by the outward (axial) force of the side gears which then compress the clutches.” As the torque increases, the more compression is put on the clutches, coupling the axles, reducing slip. If it has a 12-bolt Chevy,it was swapped in there. US Gear creates gearsets for varying high-performance uses: from your basic street/strip car all the way to full-on race cars with big-time horsepower. There is a middle ground, the 1.5, which has less deceleration lock-up over the 2-way, but retains the coupling, unlike the 1-way. An open carrier is the most street friendly design, there is no noise, chatter or clunking involved, but the classic “peg-leg” carrier is not good for drag racing. 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. Oh yeah, he's also a YouTube hero. For street/strip applications a locking differential is preferred. 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? This happens in situations like cruising or low-speed cornering, where there is no power being applied. The biggest drawback of the drop-in is strength. Eaton’s TrueTrac was the first LSD to use helical gears over clutches, eliminating the consumable clutches and further reducing the noise of chattering clutches. They are also cost effective. As mentioned, most Mustangs come equipped with a limited-slip differential from the factory. If both sides have sloped ramps but are asymmetrical, it is a 1.5-way differential. The Helical differential offers a smoother transition, along with a level of durability comparable to that of the locker. 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. The Answers: Isky’s Nolan Jamora Answers Your Tech Questions, Pt. What classifies the LSD is its overrun operation. It’s basically bulletproof. In terms of strength and durability, a full replacement locker like the Detroit Locker is the best. shop eaton 33 spline truetrac differential for 05-14 8.8. for closed course competition use only. If the LSD releases the coupling as soon as the throttle lifts, then it is a 1-way. Two degrees of pinion angle on a street car—regardless of the type of rear suspension being used, is the norm. Recommended for street/strip applications. So which is better, the LSD or the locker? Drop-in lockers, sometimes referred to as “lunchbox lockers”, are a little different. re: 12 bolt s-10 street strip rear differentials Post by ketel22 » Fri Aug 13, 2010 4:35 am thanks for the reply, i will have to contact you when i have more free time during normal hours of operation. It is also the most versatile, having the most applications. Over the decades it has been applied in heavy trucks, military vehicles, performance cars, street rods, NASCAR and all manner of off-road vehicles. 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. 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. *, We are dedicated to delivering a safe online shopping experience. 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). 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. EATON’s oldest and quite possibly best known automotive performance differential is the Detroit Locker. The LSD design is considerably quieter in the corners, and is easier to handle on the street. To get both, you can go with on-command. Pro Street Axles Ultimate Street Strip Axles from Mark Williams. Another caveat to the clutch LSD is the oil; all clutch LSDs require LSD gear oil. By Wayne Scraba of Lone Wolf Hot Rods This is the second part of the story on Mark Williams' "Ultimate Street-Strip 12 Bolt Rear End Assembly. These differentials are not preferred for off-road or performance applications, because they lack the strength and traction needed for off-road and performance conditions. The locker will free-wheel like an open diff until you hit the gas, applying torque, and the locker couples. At the strip, it didn't change the ET all that much. 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. Auburn is probably the best known brand name associated with the cone style LSD and offers units for most of the popular axle systems. Modern differentials come in many flavors—open, limited slip, locking, and spool (which is not even a differential). It is also stronger than a traction lock and should last a long time in a street toy. If you want good street performance gear it so you keep the rpm's in the optimum power range of your motor at your typical cruise mph. The Detroit Locker is the original automatic locking differential. Building a TH400 to a high hp handling level will cost a great deal of money. If that sounds like what is lurking inside your pumpkin, maybe you should read a little closer. I want no part of a spool. © 2017 Power Automedia. So instead of firing up the ol’ MIG and welding those spiders, try swapping out that peg-leg for a real performance differential. As you accelerate out of a corner, the awkward handling rears its head. They offer positive locking in the straight lines, but allow the inside wheel to spin when needed around a corner. Eaton has a new electronic locker, the ELocker. For a moderately powered street/strip car, the LSD is likely to be the best bet, but as power increases, so does the need for traction. As the car becomes more powerful and modifications increase, the drop-in will become less reliable than a full-replacement locker. The open differential is not really “geared” for performance, so it’s out as is (see drop-ins below for open carrier upgrades). If you want straight line performance gear it so that the motor is at the top of the power band at the end of the track. A locker does pretty much what it says, normally locking both axles together when torque is applied, ensuring both wheels spin regardless of traction. Good street performance or 1/8 or1/4 mile performance? Best transmission choice, hands down. Adding this style of locker does not mean you need to invest in tools to set up a gears, it is a cheap way add traction to your stock rear end. 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. This biggest drawback of running an automatic locker on the street is the noise and poor handling characteristics. This makes them less reliable, but only because the stock carrier may fail, not because of the locker. “The Detroit Locker is the original differential of its type, dating all the way back to the 1940s. The Detroit Locker from Eaton is an excellent choice for both hardcore off-road as well as strip applications. An open differential for a muscle car such as a Mustang is not particularly effective, nor is a spool. After you submit your email address, you'll receive an email a link that will let you change your password. I only used first and second gear of the C6 rather than all 3 with the 3.89's. This is the safest type of LSD, as it allows the rear tires to spin as needed. “The Eaton Posi (a clutch plate type) is the original positraction differential providing efficient transfer of power to the rear wheels equally so that acceleration is maximized yet controlled,” Saxton told us. Tire diameter, transmission choice (with or without overdrive) and desired highway cruising speed. The spool locks the axles together permanently, similar to the low-buck welded-spiders, but in a safe way. The best aspect of a locker is that you get true, fully-locked axles for maximum torque application just like a spool in the straight lines and free-spin action for the corners. For ultra-quiet and smooth operation, a gear-driven LSD is the best choice. Eaton also supplies nearly every automotive, vehicle and engine manufacturer in the world with its high-quality parts and services. They are inexpensive and smooth on the street. Once a tire has completely lost traction, the LSD operates as if it is an open differential; the slipping tire receives no torque. This can be considered a drawback of the gear-drive, but not all gear LSDs have this issue. Built without using clutches, the new S-Trac is purely mechanical, designed to maximize traction and minimize wear and slippage. 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. A couple of us felt the scourge of limited slip differential envy. For an otherwise stock or mildly modified vehicle, a drop-in is a good (read cheap) place to start. Build Your Truck or Jeep Your Way | FIND STORE. With leaf springs, the differential is able to rotate a small amount as the springs react, and this changes the pinion angle. We will never use your email address for any other purpose. When power output increases beyond the ability of an LSD, a full lock is needed. Gear-driven LSDs are becoming more and more popular. This style of differential is designed to transfer power from “the wheel that slips to the wheel that grips,” or so the commercials used to say. Rob Kinnan photographer Jeff Smith writer. Last but certainly not least, you need to consider whether your vehicle will benefit more … But it was nice on the freeway. Drop-ins are user friendly; they do not require any special set up and are compatible with C-clip axles. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Build your own custom newsletter with the content you love from OneDirt, directly to your inbox, absolutely FREE! If the differential increases the coupling regardless of forward or reverse torque upon throttle release, it is a 2-way diff. § 7522(a)(3)). You can build a TH350 to level two that would be superior to any stock TH400 in every way for about the same cost. Check out the cool parts they sent, as well as our step-by-step overview of setting up an 8.8 at home. 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. If they look like saw-teeth (one vertical, one sloped) then the LSD is a 1-way. Drop-ins function in a similar manner to a replacement locker, the locking action is based on torque application, so the handling characteristics are the same. 4. So instead of firing up the ol’ MIG and welding those spiders, try swapping out that peg-leg for a real performance differential. 2300 RPM at 65. While not as strong as a full carrier, units such as this Lock-Right from Powertrax (Richmond Gear) work very well. Each manufacturer has its own specific break-in procedures that must be followed in order to obtain optimum coupling, although all of Eaton’s clutches are pre-broken-in, not requiring a “break-in period.” While not difficult, the break-in is crucial. Spools are not the worst thing on the street, but they are pretty close. These characteristics are even more pronounced in wet and snow/ice conditions. Gear Style There are two basic styles of aftermarket gears: performance and pro. Cynthia Norris from US Gear explains what it recommends for its own products. Hot Traction Tips For Street/Strip Suspensions. 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. Installing a drop-in locker can as little as an hour or so. It is a common thread in performance circles; the rear differential gets forsaken for the glory of the engine and transmission. The clutch-type limited-slip differential is probably the most common version of the limited-slip differential. Come equipped with a limited-slip differential from the power Automedia Network need to happen to make them on. But perfect for the purpose of this puzzle is the safest type LSD! Springs react, and videos every week a new electronic locker, the.! Glory of the ramp ( or geometry of the most famous of the most traction! For drag racing, drifting and road racing automatic locker will free-wheel like an LSD can too, to. 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