Set. However, keep in mind that chassis roll causes the link angles to Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. steer may increase whenever both bottom links are shortened! Wayne right, the left rear tire can become loaded more quickly than the right I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks If you need brake brackets, A & A Manufacturing manufactures both GM Metric caliper mounts (part numbers starting with AA-113) and big GM mounts (part numbers starting with AA-049), with pricing ranging from $9.82 to $15.84 per bracket. Let's expand on the other three systems. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. clamp brackets. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . Insane video on the induced rear roll over steer. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. This will add Roll Steer as the chassis rolls over in the turn and the LR arm scribes an arc forward and shortens the left side wheel base. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. (Sold Individually). AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. On asphalt, do not make large changes to components that influence rear steer. The Asphalt 3-Link - The 3-link rear suspension system has two trailing arms mounted near the rear tires, and one third link mounted atop the rear differential that controls rear end wrap-up. UMI part numbers are 4023CM-B or 4023CM-R. REAR SUSPENSION: The following is a general list of rear ends and their dimensions to help narrow the search for a possible candidate to replace the torque tube rear end or just get a better set of gears for highway driving. 1- LZ-13-B lower mounts (pair ) 1- 384-B shock mount (right) 1- 384-C shock mount (left), *LZ-13-B is a laser cut mount that has been welded on the proper angle to fit a GM metric chassis. As the rear corners of the car move, along with the controlling arms that locate the rear-end fore and aft, each side can move the wheel on that side forward or to the rear. Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. That thought echoed Garrison's point of keeping the rear tires connected to the ground going in and through the middle, helping to provide traction off the corners. Keep in mind that any change to the the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. This is caused by the rear end swinging around the instant center, created from projecting lines through the arms to the front until the lines meet. The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Wehrs Bent Suspension Bar Angle Finder. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. A smooth entry provides a faster exit. 2- 175-C bushing for upper mounts. Please Login or Register. In simple terms, it keeps the body from roll rotating on the launch. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. Oct 12, 2013 #2. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. The Z-link System The car was set up and driven more like an asphalt car and it was fast. and the right coil-over unit behind the axle. Rear steer can either tighten a car or make it very loose. There are limits to how far we go in steering the car this way. This raised the rear roll center and hurt side bite, but aided forward bite. The track in this case was banked and had a lot of grip. Your email address will not be published. I also have a trz weld in style arb. Wehrs Modified Valance Support Weld On Clevis. The key to correctly 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. With adjustable trailing arms (rather than the factory originals), you can adjust the pinion angle by simply changing the length of the upper trailing arm. In Stock . A racer himself, he was the winner of the Street Stock Nationals in 2019. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. Decrease the Split on the Rear Panhard Bar Heights. Now with Ten properly positioned holes . (Try to bounce the rear of a car with a 4-link rear 2-4 Offset Bushings and Trailing Arms. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! The upper trailing arms are pretty much in the stock location. It takes less than two hours for an experienced welder to install the kit.. path traveled by any trailing arm will affect roll steer. The 4-bar suspension is highly adjustable and can be made to steer both directions. Get your shocks addressed (tested by someone with a shock dyno who knows what theyre doing) and then go back and work on the pinion angle, using the guidelines from the article. A downside to using the truck arms is not related to steering characteristics, but due to a narrow spring base when the springs are mounted directly on top of the truck arms, creating a narrow spring base in the rear. If you want to insert bushings with a press rather than a mallet, opt for part No. KT-1A). I was looking for more info on stock rear 4 link trailing arm angles. the right side 2023 Physics Forums, All Rights Reserved, Car lift using suspensions as lift points, Calculation of the reduced stiffness of a simple suspension, Suspension location for suspension pedestal, Bearing race diameter inequality question. tire loadings. Dual internal gusseting provides strongest rear end in the industry. made to provide such handling, you must first understand a few basics The rear axle Therefore, the rate the car feels is much less, usually around 50 percent, than the actual installed spring rate. The roll of the chassis and the movement of the Panhard bar are the two components that influence the amount of steer in these systems. chassis up during acceleration which can reduce the effectiveness of the illustration 2A. OUT OF STOCK until appox. The condition is referred to as 4-link, or use the design parameters mentioned in this article, to help The upper arms is where many very in opinion. shortening the lower links, is a reduction in loose roll steer. Raise the front LR trailing arm mount. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. Simply replace the LR bracket and have increase drive and adjustability. You can play with all of these a little to work on plunge/roll steer. loading of the rear tires. What is wrong ? I am going to raise the car next to achieve ideal front lower control arm angle (still to low for that) then corner balance and tweak from there. movements of the Under the right conditions, rear steer can be beneficial and enhance performance. Not only does the condition of rear steer affect the entry and middle handling balance, it affects handling under acceleration due to the thrust angle of the rear end being either right or left of the centerline of the car. Brand new Stamped steel, C-channel arms are strong and sturdy Improve the handling of your '78-'88 GM Metric rear suspension by replacing twisted or worn out rear control arms 11" center to center Sold each IMCA Approved. This is correct. Its on a car that Im helping with. It has been a practice for teams to align the rear end-and/or have it steer slightly to the right-to fix a tight mid-corner condition, but this goes into the category of crutches, and should not be necessary if the car is set up properly otherwise. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. (Steel). Part No. Skip to main content. This one is made by Hotchkis for GM A-body cars. corners. A 4-link $ 599.95. Mounts J-Bar to QC rear end 4 3/8 offset from pinion. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 Raise the Rear Panhard Bar Up on both sides. and rearward (R.S.) 2- 175-B upper mounts. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). The upper arms are angled to form the triangle that gives the suspension its name. Lower the Rear Panhard Bar on both sides. mounted 5 downwards to the front, coupled with 17 1/2 top links, note the left rear tire moves to the front in body roll. here a simple Q as life for you: owning an base malibu sedan 81 and had changed coils (some, new and used), and new gabriel stock shocks, Im banging my head on the paviment as this car has absolute no suspension. The upper arms on a triangulated four-link are used to center the rear axle housing from side to side; you shift the rear axle housing left or right, depending upon which bar you adjust. 3. mounted 15 upwards to the front. Also pinion angle with stock bushings. Wehrs Body Bolt Panel Inserts. Basically, we've position the bottom links to counteract the lowered the bottom links to a level position and now the bottom of the The left-rear shock mostly seems to move between 1/2-inch in rebound and up to 1/2-inch in compression during the entire lap. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). He will be showing the latest tools to enhance your chassis set up. The four holes for adjusting the lower trailing arm angle are all symmetrical, so when you move the trailing arm up or down it does not change the wheelbase of the car, said Tom Nolff, of T&D Custom Fabrication in Grant, Michigan. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. Long bottom links (equal in length or no more than 1 These tips are for an independent a-arm front suspension and 3-link rear suspension type of car, but may apply to other types of suspensions as well. Specialize in complete bushing overhauls and suspension upgrades to enhance the driving experience for your Mazda RX-7, Mazda RX-8, and Classic Mazdas (R100, RX-2, RX-3) but are more than capable of servicing all cars with the same care and attention to detail. birdcage now moves rearward (until the link reaches a level It comes with all the pieces necessary for you to start saving time and energy, and it wont break the piggy bank. I am getting ready to change my lowers out to some better ones that are adjustable. Decrease the Pre-Load on the Stabilizer Bar. Use this kit to build your own custom rear end. Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. This saves wear and tear on your U-joints while . 2). Bad shocks (and/or messed up valving) can be the culprit. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. I'm not sure of the Task Force width . $15.75. The difference is that now we can maintain rear traction-having never broken loose-and the car is angled somewhat sideways, and pointed in the right direction to get off the corner. I want just for street use, nothing but just Soft Ride. You should draw the paths to include Then, a 1" weld on the bottom inside of the left side." correct any corner entry handling problems caused by the left rear tire to move forward. That saved the factory some money. This condition may Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. The entry is more important to design for than the exit as far as rear steer is concerned." Keep in mind that trailing arm angles can become This configuration is common in General Motors cars built in and around . Dirt Track Aero clamp brackets are used in front of the axle, axle wrap-up during These arms are longer then stock to help lessen pinion angle changing during suspension travel. 1-15 How Important is it to Bump the Left Front? birdcages caused by the upper links. However, indexing can cause the rear suspension to be too harsh and the angles to which the links are adjusted. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. Adjust Cross Weight as changes are made to keep the car neutral. Wehrs Metric Trailing Arm Bolt. You can use cardboard, Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). Large 1 NPT fill plug installed for easy filling or connecting to fill tank. Our services include: Bushing overhauls, suspension repairs . Ask me how I knowL-O-L. Hope that gets you sorted out. Cars with 15-inch wheels should have a measurement of 205mm (8.07") in front. Now on to getting everything adjusted out and working. The technology related to rear steer for asphalt and dirt are somewhat different. How to find roll centre in anti-dive or anti-squat double wishbone suspension, where upper and lower arms are at angle (side view)? A trick way to produce rear steer only under acceleration is by staggering the height of the two trailing arms in the 3-link system when using a pull bar, upper-third link. These conditions call for a driving line that is more straight ahead. Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. birdcages, to rotate against the shocks and springs during If you dont do anythinig else. #2. pat the angle of the trailing arm wont really effect anything that much. We can have too much weight end up on the left-rear tire and lose traction and/or cause the car to push off the corners because of all of the forward thrust is concentrated in the left-rear tire. Rayburn builds the swing-arm type of rear suspension. Show more About this course $299.00; 160 lessons . On extremely dry, slick conditions, use lots of rear steer to the right.