It is fine. Thermostat You are now ready to remove the dash assembly. 50, Lower If it meets specifications, it is shot peened to remove all accumulated grime and paint. Laying them out on your workbench in the proper order will help you identify the correct placement of these parts during reassembly. Oil The completed differential now needs to be attached to the frame crossmember. Then press the second bushing into the arm or onto the shaft. This helps keep critical parts within easy reach. With the C3 rear suspension design, the differential is mounted to the center of the frame and two halfshafts connect to the rear wheels. Insert a cotter key in the provided hole. Make sure to keep the jack in place securely under the lower control arm. Steering knuckle to lower ball joint: 90 Ball joint to control arm fasteners: 25 Upper control arm cross-shaft end cap bolts: 35-40 Upper control arm cross-shaft to frame: Lower control arm cross-shaft end cap bolts: 45-55 Lower control arm rear cross-shaft to frame: Lower control arm front cross-shaft to frame: Idler arm to frame: 25, Shock Mount Bolt (Lower) Secure it with a hose clamp around the center and then tighten the clamp enough to compress the spring plate so you can slip it through the window (shown). 65, Wheel Nuts You can use the social sharing buttons to the left, or copy and paste the website link: https://www.chevydiy.com/c3-corvette-restoration-guide-suspension-differential-reassembly/. The completed steering system looks like this unit underneath a 1972 Corvette. JavaScript seems to be disabled in your browser. Copyright 2023, Zip Products Inc All rights reserved. Install the trailing arm into the slot in the frame. The final piece is a shim that determines the side yoke measurement. C2 and C3 Corvettes used the same idler arm from 1963-'82 for both manual and power steering applications. 50 Install the screw and tighten to specs. Let's get started. 50, Manual 07: After the Pitman arm has been separated from the control valve, the whole steering linkage will fall to the floor in one unit. I don't think it's upside down. Feed the shock through the bottom of the lower control arm and insert the top of the shaft into the opening on the frame. 4. Bolts Housing to Pinion Flange Rotate the Posi clutch pack unit (shown on a jig in step 4) until you have enough room to insert the washer. If you pull the pitman arm, it is sometimes possible to see the twist in the sector shaft splines. A piece of wood or a half piece of pipe is placed on the inside of the control arm to keep the arm from bending while the bushings are being pressed into the control arm. Loosen it one quarter turn and install the cotter key. Once this nut is secure, your helper can exit his or her perch on the frame. You are looking for a clearance measurement of .005 to .010 inch. For a better experience, please enable JavaScript in your browser before proceeding. Slowly raise the jack, while the upper knuckle ball joint opening is placed into the top control arm ball joint stud. 80 The two rear lower control arm attachments must also be securely welded to the frame. These control arms come ready for installation. If you find this problem replacing the bearings and shims should correct the issue. It is not necessary to return the same unit to your car. Nicks in the fittings and seats will cause leaks because there's a lot of pressure going on here. The outer case material changed to aluminum in 1980 to reduce the weight of the rear suspension. Attach the frame crosspiece to the differential with two 7/16-18 x 118-inch bolts and 7/16-inch lock washers. They perform an important function. Secure and tighten all lug nuts. Throughout the chapter on ram charging, air filters, [Click here to read more], Shortly after the birth of Corvette in 1953, a Russian immigrant named Zora Arkus-Duntov joined Corvette. Clamp Only because there aren't any threads protruding past the nut and the arm is further from the box than it was on my old box. When lines are backward to the ram you steer left and the ram applies pressure right snatching the steering wheel out of your hands violently. A professional can put the correct suspension settings back into your car. Now you will have to support the inside of the control arm to keep it from collapsing. Pressure Plate 150 in/lbs The fluid pressure reduces the effort it takes to turn the steering wheel. Corvette "power assist" steering has long been a very effective tool in reducing steering effort while keep us in touch with road feel, which is why Corvettes were equipped with this type of power steering to begin with. This spring is under a lot of tension and might require the use of sandbags to be placed on the frame to help attach these end links. For autocross or track day events, set the shocks on the firmest setting as this provides the best handling. Install the spindle dust shield gasket onto the spindle. Reinstall the suspension with the same number of shims to return it to its previous setting. 20, Differential Mount Bracket Because quality is so critical, Lonestar Caliper rebuilds all of its power steering pumps, rams, control valves and steering gears in-house. Torque specifications for 68-82 Corvettes FT/LBS (Unless specified) Front Suspension: Rear Axle: Front Wheel Bearings 12 Differential Cover Bolts 50 Upper Ball Joint Nut 70 Driveshaft to Pinion Flange 15 Lower Ball Joint Nut 90 Differential Front Mounting Bolt 65 Ball Joint Attachment Nut 28 Steering Arm to Spindle 70 Brake System: Place the frame on four safety stands that are sturdy and protected with pieces of cardboard. It connects the upper and lower control arms via two ball joints. The fourth VIN digit [Click here to read more], HOW TO RESTORE YOUR C3 CORVETTE: 1968-1982, Basic Engine Modifications to Improve C5 Corvette Performance (Part 7), 74 Final Assembly Steps of Your Big-Block Chevy Engine Rebuild, How to Rebuild Your GM Transmission: TH400 Transbrake Guide, Comparing Cylinder Blocks and Fasteners for Chevy Small Block Engines, Chevy Big-Block Performance: Lubrication System Guide, How to Replace the Rocker Panel on a 67-72 Chevy Truck, How to Rebuild Chevy and GM Axles: Step-by-Step, How to Build a Chevy Street Stock Engine for Circle Track Racing, Small-Block Chevy Dyno Tests: Cams & Valvetrain Performance, History of GM Automatic Overdrive Transmissions, How to Source Chevy Big-Block Cylinder Heads, Oil and Lubrication Systems Guide for Big-Block Chevy Engines, 1955-1996 Chevy Small-Block Performance Guide: Camshafts Manual (Part 5), The Ultimate Chevy Big-Block Parts Resource, How to Produce More Power in Your Chevy Small Block Engine, C5 Corvette Brake Upgrades to Improve Performance (Part 5), How to Remove the Dash from a 70-72 Chevelle, C2 Corvette Restoration by the Numbers: What to Look For. Slide the bushings onto the stabilizer bar and into place. If you liked this article you will LOVE the full book. After this is done, your first stop should be the local Corvette alignment shop. You won't even need one quart of power steering fluid to fill the system. If you take two shims out of one side, for example, you must place the same number onto the other side. This frame has been carefully placed on four safety stands and four large pieces of cardboard to protect the frame from any scratches. Cover Bolts The movable face angle of all Comet asymmetric system drivers and drivens is 18 degrees, their "stationary" (opposing) face is 2-1/2 degrees and the Comet asymmetric belt angles likewise correspond. This differential has been assembled and is ready for installation. New parts have been welded into place by a professional Corvette repair shop. This includes the upper and lower control arms, steering knuckle with brake rotor, installed wheel bearings, and coil spring. Oil Remove the parking brake hardware (reverse the procedure that starts in Step 3). If the threads engage the entire nut and you torqued to spec, you're good to go. This bolt has a 13/16- inch head. The ideal contact pattern (centered on the teeth) is the drawing in the middle. This is the perfect time to install refurbished or rebuilt components. This photo shows a typical pinion bearing with a crush sleeve between the inner and outer bearing. Original-spec shocks have a service life thats at the lower range of this estimate, while premium aftermarket shocks last at the upper range. This prevents them from loosening and backing out. 19:Install a 3/8-242 1/4 cap screw in one end of the shaft. Then, service the pump to "full" on the dipstick at operating temperature and you're good to go. The steering knuckle spindle plays a crucial role in front suspension dynamics. Torque the bolts to 70 ft-lbs. Then install the nut and tighten until you get the proper drag on the nut (18 to 22 inch-pounds) on new gears. 42: Install the rotors and calipers and tighten the wheel bearings as per the instructions in the shop manual. The 1975-'79 "canned-ham" pump is very similar to the revised Saginaw pump used from 1980-'82. If it is not properly seated use a pipe wrench to rotate the spring into the correct position. When Zora Duntov unveiled the independent rear suspension of the 1963 Corvette, he elevated the American sports car to a world class level. Once the bolts have been secured, install the upper control arm bracket. 21: To make the bushing installation easier, place all of the bushings in a freezer overnight. Torque these bolts to 70 ft-lbs with a 5/8-inch socket. Attach a nut to the bottom of the bolt using a 7/8-inch socket on the nut and a 13/16- inch wrench on the bolt head and torque it to 100 ft-lbs. Recheck the side yoke endplay. Refer to the Chevrolet Shop Manual or other authorized manuals for the correct assembly and torque information. This bracket is attached to the lower control arm on each side of the front suspension. Step-3: Install Nut on Control Arm A 9/16x18x2532-inch bolt secures the rear lower control arm to the frame. 25 44: After the car is sitting back on the ground, you will need to torque the upper and lower control arm bushings, cap screw and collars. Now mount the stabilizer bar and brackets to the frame. Big-block half shafts from 1968 to 1974 use 9/16 x 14 x 33164-inch bolts and heavy-duty caps. 30: Install the upper control arm bumpers. Caliper Then balance the valve. Pulley should not wobble with engine running. Small-blocks from 1968 to 1979 use two U-bolts on each side to attach the shaft to the differential, which are secured with 9/16-inch nuts. 70 The control valve screws onto the end of the draglink. The fl at washer has a notch that matches the one on the spindle to prevent it from turning. These springs were installed on Corvettes built at the new Bowling Green assembly plant. The trailing arms house the parking brake, brake calipers, and rotors. Lonestar Caliper Company offers a complete line of power steering parts, components, and systems for C2 and C3 Corvettes, including pulleys, power steering pump caps, power steering brackets and steering shaft couplings. Manifold in/lbs The trailing arm in this 1969 convertible is being removed so it can be overhauled by Van Steel. Thermostat Written by Walt Thurn and Posted with Permission of CarTechBooks. The larger the bars, the more taut the ride. Housing Cover 12: Now remove the retaining bolts and take the upper control arms out. Use a 1/2-inch-drive torque wrench with a 7/8-inch nut and torque it to 75 ft-lbs. When the ball joint is aligned, continue to raise the jack while pushing the ball joint stud through. 41: Re-pack the front wheel bearings and install them into each rotor along with the grease seals. 80 Replacement of this system is straightforward because Chevrolet made it so simple to service. We will be focusing on the front suspension in this article and will be replacing all of the major components in a 1978 Corvette. Slowly lower the jack to see if the upper and lower control arms securely hold the coil spring in place. (You can also use a large punch or another piece of solid metal.) Apply silicone lubricant before installing the seal gear into the housing. 60, Control Arm front Pivot Bolt 75, Lower Shock Mount Bolt C3 C4 C56 C56-A C59 C6 C66M-R CD4E Chrysler CIB5 Cruise-O-Matic . Make sure the spring is properly seated in the control arm so it does not slip. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Your email address will not be published. Flywheel In addition it houses the front wheel bearings, brake rotors, calipers, and brake lines. A 9/16x18x2532-inch bolt secures the rear lower control arm to the frame. We're working with technician Paul Taylor of Hot Rods by Dean in Phoenix, who is going to walk you through the C2/C3 power steering system. Housing The control arm has a dimple stamped into it and the end of the bottom coil must rest next to this dimple. The C2/C3Corvette has two identical tie rod assemblies that connect the left and right steering arms to the steering relay rod. Make sure that they are completely seated. This is a good procedure to complete before taking the car to the alignment shop. Starting in 1963, the VIN denoted coupe or convertible and build sequence. Use a large piece of pipe or something that is the same diameter as the seal. The measurement should be .006 to .008 inch. This is the perfect time to install the gas tank between the back frame rails. All of these components should be evaluated, inspected, and repaired or replaced as necessary. Remember the coil spring will be pushing down on the control arm with tension. Van Steel constructed this tool to spin the Posi-Traction unit on a jig that is mounted to a post. We take orders in our showroom or you may call your order in over the phone and we will prepare your items in advance so you do not have to wait. First start stacking a side gear with a clutch disc that has two tabs or ears on it. Count on Zip Corvette for the best quality Corvette Parts available for your 1968-1982 Corvette. A large-diameter steering wheel and skinny, pizza-cutter tires reduced steering effort, but not by much. When draining the oil from the differential, check for a burning odor, which indicates overheating of the gears and case. 3. All of the power steering hydraulic hoses are installed. Manifold A couple of spacer plates are employed between the subframe and framerails. Oil The power ram shaft A-bracket attaches to the lefthand framerail. Camber 35 The rotor is now ready to be installed. The second way is to do it in the car but you must remove the pitman arm and take torque measurements by placing a torque wrench on the steering wheel hub and measuring steering gear torque through the steering column. Drain Plug Fill oil reservoir to proper level and let the oil remain undisturbed for at least two minutes. (This will allow you to drive the car without doing any real damage to the front tires and suspension.) Standard non-performance Corvettes are fitted with a front antiroll bar that is designed to provide a smooth ride. Add or remove shims that were installed in step 8 on page 105, depending on how far the measurement is from the desired specification. 04:Loosen the power steering pump hoses from the control valve and let them drain into a container. Distributor 20, Drive Spindle Support to- Carefully continue to tap the seal in place while moving the shim around to ensure that the gap is the same all around. Pump Cover Many Corvette suppliers offer bearing and clutch pack kits that make an overhaul procedure much easier. Slowly raise the jack making sure the spring stays seated in the control arm. Slowly rotate the gears to check for any obvious signs of one gear rubbing on another.
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