*Compatibility Chart:
1, Air suspension spring bags installed on the Truck, Coach and Trailer are designed usually as generic types.
2, Firestone Part Number collected all the air suspension model, which could be used as an Integration Code while searching on eBay or Amazon.
3, You can distinguish specific model of air suspension spring bags on your Autotruck/Heavy-Duty Truck/Touring Car/Passenger Coach/Trailer by checking original SPN(Supplier Part Number) listed as below, all of which has a consistent one-to-one match with specific Firestone Part Number.
Chevrolet Silverado
Chevrolet Silverado 1500 Base 4.3L 1999-2006
Chevrolet Silverado 1500 Base 4.8L 1999-2005
Chevrolet Silverado 1500 Base 5.3L 1999-2005
Chevrolet Silverado 1500 Classic Hybrid 5.3L 2007
Chevrolet Silverado 1500 Classic LS 4.3L 2007
Chevrolet Silverado 1500 Classic LS 4.8L 2007
Chevrolet Silverado 1500 Classic LS 5.3L 2007
Chevrolet Silverado 1500 Classic LT 4.8L 2007
Chevrolet Silverado 1500 Classic LT 5.3L 2007
Chevrolet Silverado 1500 Classic LT 6.0L 2007
Chevrolet Silverado 1500 Classic SS 6.0L 2007
Chevrolet Silverado 1500 Classic WT 4.3L 2007
Chevrolet Silverado 1500 Classic WT 4.8L 2007
Chevrolet Silverado 1500 Classic WT 5.3L 2007
Chevrolet Silverado 1500 Custom 4.3L 2002
Chevrolet Silverado 1500 Hybrid 5.3L 2004-2006
Chevrolet Silverado 1500 LS 4.3L 1999-2006
Chevrolet Silverado 1500 LS 4.8L 1999-2006
Chevrolet Silverado 1500 LS 5.3L 1999-2006
Chevrolet Silverado 1500 LS 6.0L 2004-2005
Chevrolet Silverado 1500 LT 4.3L 1999-2005
Chevrolet Silverado 1500 LT 4.8L 1999-2006
Chevrolet Silverado 1500 LT 5.3L 1999-2006
Chevrolet Silverado 1500 LT 6.0L 2004-2006
Chevrolet Silverado 1500 SS 6.0L 2003-2006
Chevrolet Silverado 1500 WT 4.3L 2002-2004&2006
Chevrolet Silverado 1500 WT 4.8L 2002-2004&2006
Chevrolet Silverado 1500 WT 5.3L 2002-2004&2006
Chevrolet Silverado 1500 Z71 4.3L 2004
Chevrolet Silverado 1500 Z71 4.8L 2004
Chevrolet Silverado 1500 Z71 5.3L 2004
GMC Sierra
GMC Sierra 1500 Base 4.3L 2002-2005
GMC Sierra 1500 Base 4.8L 2002-2005
GMC Sierra 1500 Base 5.3L 2002-2005
GMC Sierra 1500 Base 6.0L 2004
GMC Sierra 1500 C3 6.0L 2001
GMC Sierra 1500 Classic Denali 6.0L 2007
GMC Sierra 1500 Classic Hybrid 5.3L 2007
GMC Sierra 1500 Classic SL 4.3L 2007
GMC Sierra 1500 Classic SL 4.8L 2007
GMC Sierra 1500 Classic SL 5.3L 2007
GMC Sierra 1500 Classic SLE 4.8L 2007
GMC Sierra 1500 Classic SLE 5.3L 2007
GMC Sierra 1500 Classic SLE 6.0L 2007
GMC Sierra 1500 Classic SLT 5.3L 2007
GMC Sierra 1500 Classic SLT 6.0L 2007
GMC Sierra 1500 Classic WT 4.3L 2007
GMC Sierra 1500 Classic WT 4.8L 2007
GMC Sierra 1500 Classic WT 5.3L 2007
GMC Sierra 1500 Denali 6.0L 2002-2006
GMC Sierra 1500 HT 4.3L 2002
GMC Sierra 1500 HT 4.8L 2002
GMC Sierra 1500 HT 5.3L 2002
GMC Sierra 1500 Hybrid 5.3L 2005-2006
GMC Sierra 1500 SL 4.3L 1999-2003&2006
GMC Sierra 1500 SL 4.8L 1999-2003&2006
GMC Sierra 1500 SL 5.3L 1999-2003&2006
GMC Sierra 1500 SLE 4.3L 1999-2004
GMC Sierra 1500 SLE 4.8L 1999-2006
GMC Sierra 1500 SLE 5.3L 1999-2006
GMC Sierra 1500 SLE 6.0L 2004-2006
GMC Sierra 1500 SLT 4.3L 1999-2004
GMC Sierra 1500 SLT 4.8L 1999-2004
GMC Sierra 1500 SLT 5.3L 1999-2006
GMC Sierra 1500 SLT 6.0L 2004-2006
GMC Sierra 1500 WT 4.3L 2002-2006
GMC Sierra 1500 WT 4.8L 2002-2006
GMC Sierra 1500 WT 5.3L 2002-2006
GMC Sierra 1500 WT 6.0L 2004
*Air Suspension Structure:

1. Stud
A permanent part of the bead plate assembly used to attach the airspring to the suspension.
2. Combo Stud
Combination mounting stud and air fitting.
3. Blind Nut
A permanent part of the bead plate assembly providing an alternate mounting system to the stud.
4. Air Fitting Hole
A tapped hole usually 1/4" N.P.T. providing air entrance for the part.
5. Bead Plate
Permanently crimped onto the bellows at the factory allowing complete part leak testing prior to shipment.
6. Bellows
The heart of an Airide spring. Includes at least four plies, or layers, of material–an inner layer, two plies of cord-reinforced fabric, and an outer layer.
7. Bumper (Optional)
A solid molded rubber fail-safe device used on many suspension applications. Prevents excessive damage to vehicle and suspension in the case of sudden air pressure loss.
8. Piston
The lower section of the 1T and 1X style of airspring made from aluminum, steel or fiber reinforced plastic. Provides lower mounting arrangement for the airspring in the form of tapped holes or studs.
9. Piston Bolt
Attaches the piston to the bellows assembly. Extended, in some cases, to serve as a means of attaching the spring to the suspension.
10. Girdle Hoop
A ring between the convolutions of the convolutedtype air spring.
*Generation & Evolution:
Chevrolet Silverado
GMT800 First generation (1998-2005)
GMT901 Second generation(2006-2013)
GMT K2XX Third generation(2014-2018)
GMT T1XX Fourth generation(2019-present)
GMC Sierra
GMT800 First generation (1998-2005)
GMT902 Second generation(2006-2013)
GMT K2XX Third generation(2014-2018)
GMT T1XX Fourth generation(2019-present)
*Platform Drive Layout:
Front-engine, rear-wheel-drive
Front-engine, four-wheel-drive
*Features and Benefits:
- Easy to install. No need to drill.
- Provides Up To 2500lbs Capacity
- Increase stability and improve ride quality
- Keep your vehicle level when you are hauling a heavy load
- Improve steering control and braking when you are hauling or towing
- Reduce strain on rear suspension
- Military Grade Armor Steel to ensure strength
- Directly Bolts In To Factory Holes
*OEM Part Number:
7X1239
*Item Specifications:
- Key Words: Rear Air Suspension Tow Assist Bag Over Load Kit For 99-06 Chevy Silverado 1500
- Package Includes:Two - Standard Air Springs w/Mounting Hardware
Notes : Please double confirm the compatibility as well as the OEM number before purchasing.
Instruction is not included. Professional installation is recommended.
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