Kit 59209 MN-682 • (02804) • ECR 6370 Chevrolet Silverado/ GMC Sierra, GMT 800 & GMT 900 INSTALLATION GUIDE For maximum effectiveness and safety, please read these instructions completely before proceeding with installation. Failure to read these instructions can result in an incorrect installation.
TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Important Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Notation Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Installation Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Hardware List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SlamAir Introduction The purpose of this publication is to assist with the installation, maintenance and troubleshooting of the SlamAir air spring kit. It is important to read and understand the entire installation guide before beginning installation or performing any maintenance, service or repair. The information here includes a hardware list, tool list, step-by-step installation information, maintenance tips, safety information and a troubleshooting guide.
SlamAir Installation Diagram Shackle hanger installation shown fig. 1a In some situations, the upper bracket will need to be mounted in an inverted position as shown in fig. 1a to the right. Carefully read the instructions for proper installation. Q H NOTE: The upper frame/ bracket/ hardware will be different depending on the model you have (GMT 800 or GMT 900). See the instruction section, “Attaching the Upper Bracket,” for further details. C F A fig.
SlamAir Installation Diagram Flipped axle installation shown Q H NOTE: The upper frame/ bracket/ hardware will be different depending on the model you have (GMT 800 or GMT 900). See the instruction section, “Attaching the Upper Bracket,” for further details. C A F This installation would be typical for a flipped axle lowering application. D fig. 2a S M L E I K R or T S NOTE: It wil be necessary to use the L-bracket so that the lower bracket has something to lock to. E 4 F fig.
SlamAir HARDWARE LIST Item A B C D E F G H I J K L M N O Part # 58482 10549 07940 03616 01426 10583 17159 18454 18444 18447 18435 17124 18414 17145 17129 Description................................Qty Air spring ...................................... 2 Installation tool with nut ................ 1 Upper bracket .............................. 2 Lower bracket .............................. 2 Clamp bar .................................... 2 U-bolt............................................
SlamAir GETTING STARTED 1. Determine the custom ride height of the lowered vehicle. The custom ride height is the distance between the bottom edge of the wheel-well and the center of the hub when the vehicle is in the custom, lowered condition (fig. 3). In some cases, the ride height is not perfectly level. a. Remove unusual loads and examine the vehicle from the side to ensure it is on a level surface. b.
SlamAir ASSEMBLING THE INSTALLATION TOOL 1. The tool provided with this kit will assist in proper setup and alignment of the air spring and will also position the upper bracket for drilling the bolt holes. The tool attaches to the upper and lower bracket and is rigid so that it will self-align the upper bracket. The threaded section of the upper part of the tool ensures that the air spring can only be mounted at the correct height. 2.
SlamAir ATTACHING THE LOWER BRACKET 1. Set the installation tool assembly on the leaf spring. NOTE GMT 800 (1999 to 2007) classic models mount forward of the axle. GMT 900 (2007 and later) models mount behind the axle. 2. Place the hook end of the lower bracket (D) over the stock U-bolt or the edge of the L-bracket (for flipped axle lowering kits) (fig. 1 or 2). NOTE This is important so that the lower bracket does not “walk” up the leaf spring. 3.
SlamAir 6. Attach the upper bracket at the forward lower hole with a self-tapping bolt (O) (fig. 8). Tighten the rear lower hole frame bolt securely. 7. Center punch and drill the two remaining upper holes (fig. 8). Drill a 5/16” hole in the forward upper hole and attach with a 3/8” self-tapping bolt (O). Drill a 3/8” hole in the rear upper hole, attaching with a 3/8” frame bolt (G), large washer (J) and nyloc nut (K).
SlamAir 4. Remove the installation tool and attach the upper brackets (fig. 9): - Attach a flat washer (I) to the long 3/8” bolt (N). - Insert the bolt through the upper bracket, into and through the inside of the frame. - Insert the frame spacer (P) over the long bolt, into the frame (from the inside). - Cap with a large flat washer (J) and nyloc nut (K). - Repeat for all four bolts. Tighten securely. - Reattach the brake line bracket if previously removed. MOUNTING THE AIR SPRING 1.
SlamAir 4. Place a 5/16” nut (GG) and a star washer (FF) on the air valve. Leave enough of the inflation valve in front of the nut to extend through the hole and have room for the rubber washer (EE), flat washer (DD), and 5/16” nut (GG) and cap (CC). There should be enough valve exposed after installation - approximately 1/2” - to easily apply a pressure gauge or an air chuck (fig. 11). 5. Push the inflation valve through the hole and use the rubber washer (EE), flat washer (DD), and another 5/16” nut (GG).
SlamAir ALIGNING THE AIR SPRING IMPORTANT: With the bottom of the air spring still loose, inflate the air spring to approximately 10 PSI. ushion PISTON Air Equ lC of a 1. Use the slotted adjustment in the lower bracket to correctly align the air spring between the upper and lower brackets. This can be accomplished by tapping it inboard (towards the vehicle) or outboard (towards the wheel) for proper alignment.
SlamAir Before Operating INSTALLATION CHECKLIST Clearance test — Inflate the air springs to 60 PSI and make sure there is at least ½” clearance from anything that might rub against each sleeve. Be sure to check the tire, brake drum, frame, shock absorbers and brake cables. Leak test before road test — Inflate the air springs to 30 PSI and check all connections for leaks. Refer to “Checking for Leaks” on page 12. All leaks must be eliminated before the vehicle is road tested.
SlamAir Maintenance and Servicing Minimum Air Pressure Maximum Air Pressure 10 PSI 100 PSI FAILURE TO MAINTAIN CORRECT MINIMUM PRESSURE (OR PRESSURE PROPORTIONAL TO LOAD), BOTTOMING OUT, OVER-ExTENSION OR RUBBING AGAINST ANOTHER COMPONENT WILL VOID THE WARRANTY. MAINTENANCE GUIDELINES NOTE By following these steps, vehicle owners will obtain the longest life and best results from their air spring. 1. Check the air pressure weekly. 2. Always maintain normal ride height. Never inflate beyond 100 PSI.
SlamAir Product Use FREQUENTLY ASKED QUESTIONS Q. Will installing air springs increase the weight ratings of a vehicle? No. Adding air springs will not change the weight ratings (GAWR, GCWR and/or GVWR) of a vehicle. Exceeding the GWVR is dangerous and voids the Air Lift warranty. Q. Is it necessary to keep air in the air springs at all times and how much pressure will they need? The minimum air pressure should be maintained at all times.
SlamAir GUIDELINES FOR ADDING AIR 1. Start with the vehicle level or slightly above. 2. When in doubt, always add air. 3. For motorhomes, start with 50-100 PSI in the rear because it can be safely assumed that it is heavily loaded. 4. If the front of the vehicle dives while braking, increase the pressure in the front air bags, if equipped. 5. If it is ever suspected that the air bags have bottomed out, increase the pressure (fig. 17). 6. Adjust the pressure up and down to find the best ride. 7.
SlamAir Warranty and Returns Policy Air Lift Company warrants its products, for the time periods listed below, to the original retail purchaser against manufacturing defects when used on catalog-listed applications on cars, vans, light trucks and motorhomes under normal operating conditions for as long as Air Lift manufactures the product.
Need Help? Contact our customer service department by calling (800) 248-0892, Monday through Friday, 8 a.m. to 5 p.m. Eastern Time. For calls from outside the USA or Canada, our local number is (517) 322-2144. Register your warranty online at www.airliftcompany.com/warrantyreg.
