If you are searching for an 18-inch lift kit, first check whether you mean an 18-inch gas strut for a hatch, topper, or toolbox, or a suspension lift for a truck. The two 18-inch products below are replacement gas struts, not vehicle suspension kits. The Rough Country options are suspension lifts, but none provides an 18-inch lift. Choose the 18-inch struts for a compatible panel or cover; choose a truck kit only if its listed vehicle application matches yours.
| Product | Best for | Key detail |
|---|---|---|
| AiYiGu 18-Inch Gas Struts | Replacing a pair of gas supports | 40 lb/178 N each; 18.7-inch extended length |
| AUCLIDIS 18-Inch Gas Struts | Camper-shell or topper replacements | OEM interchange numbers and 10 mm ball sockets |
| Rough Country 6-Inch Lift Kit | Listed Silverado and Sierra 1500 4WD applications | 6-inch suspension lift with N3 shocks |
| Rough Country 4-Inch Lift Kit | Listed Ford F-150 4WD applications | 4-inch suspension lift; retains factory track width |
| Rough Country 3.5-Inch Lift Kit | Truck owners seeking a moderate lift | 3.5-inch front and 2.5-inch rear lift |
AiYiGu 18-Inch Gas Struts
These two gas struts are best for replacing a matched pair of lift supports when the required length and force match the original parts. Each strut is rated at 40 lb/178 N. The listed hole-to-hole length is 18.7 inches extended and 10.82 inches compressed.
Choose this set if your application uses compatible mounting points and the original supports have matching measurements and force. The package includes two struts, and the listing says installation uses a flat screwdriver without special tools. It was selected because it directly matches the 18-inch gas-support interpretation of the search.
Limitation: The listing says the set comes without brackets, so confirm that your existing mounting hardware fits before ordering. Do not choose it based on length alone; force and connection style also matter.
AUCLIDIS 18-Inch Camper-Shell Struts
This pair is best for buyers replacing gas struts on a camper shell, truck topper, canopy door, window, or toolbox when the original part number matches. The listing identifies interchange numbers including C16-20651, C16-33313, SE187P40, and Lift-O-Mat 025248.
The struts measure 18.70 inches extended and 10.82 inches compressed, measured from ball center to ball center. Both connections are described as 10 mm nylon ball sockets. It was selected for its stated replacement-part references, which help buyers compare against the markings on their existing struts.
Limitation: The listing advises checking the original part number before purchase. A similar length does not establish compatibility if the connector, force, or application differs.
Rough Country 6-Inch Silverado Lift
This is a suspension lift, not an 18-inch gas strut kit. It is best for owners of the listed Chevy Silverado or GMC Sierra 1500 4WD model years 1999–2006 and Classic who want six inches of lift. The kit includes N3 shocks with 10-stage variable valving, a 54 mm body, and fluid rated to –40°C.
Rough Country states that the kit preserves OEM geometry by keeping torsion bars and axles in factory positions, and that it reuses original travel stops. It was selected as the closest substantial suspension-lift option among the supplied products.
Limitation: It does not provide an 18-inch suspension lift. Confirm the truck’s year, model, and drivetrain against the product application before purchase.
Rough Country 4-Inch Ford F-150 Lift
This kit is best for owners of the listed 2015–2020 Ford F-150 4WD models seeking a four-inch suspension lift. Its stated features include increased ground clearance, a front-to-rear leveling effect, and retention of factory track width. The listing says it fits 18-inch-or-larger factory wheels without extras; that wheel measurement is not the lift height.
It was selected as a clearly specified truck suspension option for buyers whose search actually means a vehicle lift kit. The leveling feature may suit buyers seeking a more balanced stance.
Limitation: This is a four-inch kit for specified F-150 applications, not an 18-inch kit. Verify exact vehicle fitment before choosing it.
Rough Country 3.5-Inch Lift Kit
This option is best for a buyer seeking a moderate truck lift with a front-to-rear height difference. It provides 3.5 inches of front lift and 2.5 inches of rear lift. Listed features include N3 front struts and rear shocks, application-specific velocity-sensitive valving, and forged aluminum upper control arms.
The listing says the setup creates room for tires up to 295/55R20. It was selected because it offers a different lift height and includes suspension components intended to help maintain geometry at the raised height.
Limitation: This kit is not an 18-inch lift. The supplied product details do not identify its vehicle application, so confirm fitment with the seller before purchase.
Buying Guide
Do you need an 18-inch gas strut or a suspension lift?
Gas struts support a raised panel, hatch, topper, canopy, or toolbox lid. Suspension lift kits change a vehicle’s ride height. These products serve different purposes and cannot substitute for one another. If your search refers to a truck lift, compare the kit’s lift height and vehicle application rather than the 18-inch strut measurements.
How do you choose replacement gas struts?
Compare the original strut’s extended and compressed lengths, force rating, connector type, and part number. For the two listed strut sets, the stated extended length is about 18.7 inches and compressed length is 10.82 inches, but that does not guarantee a fit. Match the 40 lb/178 N force and mounting connections to the original support as well.
What should you check before buying a truck lift?
Confirm the make, model, year, and drivetrain listed for the kit. Then compare the actual lift height, included shocks or struts, wheel-fitment statements, and any stated geometry details. The supplied options are 3.5, 4, and 6 inches—not 18 inches. Do not treat a statement about fitting 18-inch wheels as an 18-inch suspension lift.
Frequently Asked Questions
Is an 18-inch gas strut the same as an 18-inch truck lift?
No. An 18-inch gas strut is a lift support for a panel or lid, while a truck lift kit raises the vehicle’s suspension by a specified amount.
Are the listed gas struts exactly 18 inches long?
The products are described as 18-inch struts, but their listed extended measurement is 18.7 inches. Check the measurement method and original part dimensions before ordering.
Can I choose a gas strut by length alone?
No. Match the force rating, compressed length, extended length, connectors, and applicable part number to the original support.
Which listed product provides an 18-inch suspension lift?
None of the supplied suspension kits provides an 18-inch lift. Their stated heights are 3.5, 4, and 6 inches.