Best Square Body LS Swap Motor Mounts for Chevy C/K Trucks
For enthusiasts converting older square‑body and OBS Chevy/GMC trucks to modern LS power, choosing the right motor mounts is essential. The following five options are among the most relevant, offering adjustable fitment, solid construction, and compatibility with common LS engines and a range of transmissions. Each product is designed to help position the engine accurately for optimal clearance and performance in 1973–1998 square body and OBS chassis.
| Product | Brand | Key Features |
|---|---|---|
| LS Swap Motor Mounts Compatible with 1973-1998 Square Body / OBS Chevy GMC Truck | Goopool | Engine placement adjustment; supports multiple transmissions; broad LS compatibility |
| 1973-1987 Chevy Square Body Truck – LS Swap Engine Mount Kit | ICT Billet | Preserves factory crankshaft/bellhousing location; no tunnel modifications; includes OE mounts |
| LS Swap Motor Mounts for Square Body/Fuel Tank Chevrolet GMC | folosem | Carbon steel with powder coat; high strength; wide engine compatibility |
| ECOTRIC LS Conversion Engine Mounts for 1973-1998 Square Body | ECOTRIC | Adjustable plate; supports LS engines; compatible with numerous GM powertrains |
| YZQPNB LS Conversion Engine Mounts Compatible with Square Body / OBS | YZQPNB | Broad LS compatibility; supports 1997–2014 LS engines; strong mounting plates |
Goopool LS Swap Motor Mounts
The Goopool LS Swap Motor Mounts are designed for 1973–1998 OBS and square body Chevrolet and GMC trucks, including 2WD and 4WD configurations. They feature adjustable engine placement within the engine bay to help achieve the desired clearance and balance. The mounts accommodate a wide range of transmissions, including 4L60E/4L65E, TH350, TH400, TH700R4, and 4L80, making them versatile for different build goals. Compatible with a broad set of LS family engines—from LS1 through LS9 and the LS-based truck engines in the 4.8L/5.3L/6.0L/6.2L families—these mounts are positioned to facilitate a straightforward installation into square body and OBS trucks with standard or automatic transmissions. The design emphasizes adjustability and compatibility with classic C/K trucks like C10, C20, C1500, C2500, and C3500 series, including C/K generations common to the era.
With slotted mounting for fine adjustment, these mounts help you dial in engine alignment relative to the transmission bell housing. They are intended to reduce the need for extensive fabrication while still enabling a solid, reliable mount system for high-torque LS builds. Users should verify fitment for their specific chassis and transmission combination, but the Goopool mounts are aimed at creating a practical path toward LS swaps in a classic chassis that remains popular among retro truck enthusiasts.
ICT Billet LS Swap Engine Mount Kit
The ICT Billet LS Swap Engine Mount Kit is tailored for 1973–1987 Chevy square body trucks and supports 2WD and 4WD LS swaps. The kit is designed to maintain the factory SBC crankshaft and bellhousing location, meaning less modification to the transmission tunnel, driveshaft, or linkages. Included are OE-style rubber mounts that attach to the frame, plus the upper engine-side mounts, delivering a clean, straightforward installation path for LS engines. The approach prioritizes preserving original geometry where possible while enabling a reliable mounting platform for modern LS powertrains in older square bodies. The kit appeals to builders seeking a more plug-and-play installation and a result that remains faithful to the truck’s original architecture.
Engine compatibility spans a wide LS spectrum, including the common LS1/LS2/LS3/LS6/LS7/LS9, as well as various GM small-block and truck engines that fall within the LS family’s range. By retaining the crucial alignment points, this kit helps ensure proper driveline angles and smoother transmission operation. For builders wanting a balance of authenticity, ease of install, and robust mounting support, ICT Billet provides a tested route for LS swaps on older square-body platforms.
folosem LS Swap Motor Mounts
folosem’s LS Swap Motor Mounts for Square Body/C/K trucks feature a durable carbon steel construction with a protective powder coating designed for high-torque LS applications. The mounts are engineered to handle the stresses of powerful LS engines with resistance to rust and corrosion, ensuring long-term stability in demanding driving conditions. Compatibility spans the entire spectrum of Chevrolet LS engines—from LS1 through LS9—and includes 4.8L/5.3L/6.0L/6.2L truck variants from the late 1990s to early 2010s. The mounts are specified for 1973–1998 OBS and square-body Chevrolet/GMC 2WD/4WD trucks, covering the C/K family and popular chassis like K1500, K2500, and K3500. This kit’s emphasis on robust materials and broad engine compatibility makes it a strong choice for builders seeking durable performance and reliable fit in a classic platform.
Two notable benefits are the sturdy mounting system and its broad engine range compatibility, including LSX LM7 LR4 LQ4 LQ9 L33 LH6 L92 L76 L99 L96 L82 L83 L84 L86 L87 when applicable. The design aims to minimize installation friction while maximizing the engine’s secure support during aggressive acceleration, cornering, and off-road use. The folosem mounts can serve both street rodders and weekend warriors who demand dependable mounting hardware for a long-lasting LS swap in a square-body chassis.
ECOTRIC LS Conversion Engine Mounts
ECOTRIC’s LS Conversion Engine Mounts are designed for 1973–1998 Square Body and OBS Chevy/GMC trucks, including 2WD and 4WD configurations and full-size C/K platforms. The adjustable mounting plate is intended to simplify the process of installing 1997–2015 Gen III/IV LS engines into classic GM platforms. The kit supports LS1 through LS9, as well as common truck LS variants, and notes compatibility with LSX LM7 LR4 LQ4 LQ9 L33 LH6 L92 L76 L99 L96 L82 L83 L84 L86 L87 family units. The mounts also facilitate fitting alongside a range of transmissions—both automatic and manual—by accommodating practical alignment adjustments for a smoother swap experience. This product emphasizes adaptability, broad engine compatibility, and a install-friendly approach for square-body enthusiasts pursuing LS upgrades.
In addition to engine compatibility, ECOTRIC highlights the ability to align the engine with transmission choices such as 4L60E, 4L65E, TH350, TH400, TH700R4, and 4L80E. Users should verify their exact drivetrain configuration but can anticipate a mounting system designed to reduce tunnel interference and enable straightforward installation in many common C/K and Suburban chassis configurations.
YZQPNB LS Conversion Engine Mounts
YZQPNB’s LS Conversion Engine Mounts are designed for 1973–1987 Square Body and 1988–1998 OBS Chevy/GMC trucks, offering wide LS engine compatibility including LS1/LS2/LS3/LS6/LS7/LS9 and various truck variants from 1999–2013. The mounts are built to support both small-block LS engines and broader LS family configurations, with corresponding fits for LSX variants such as LM7 LR4 LQ4 LQ9 L33 LH6 L92 L76 L99 L96 L82 L83 L84 L86 L87. The kit explicitly covers C10, C20, C1500, C2500, C3500, K1500, K2500, and K3500 platforms, ensuring a robust, versatile fit for square-body and OBS chassis. This product aims to offer a flexible mounting solution capable of accommodating a wide array of LS powertrains while maintaining structural integrity under high torque conditions.
Compatibility with multiple transmission types is noted, enabling installation of automatic or manual transmissions with forward-facing engine positioning adjustments. Builders can expect an adaptable mounting system that supports engine relocation for improved driveline angles, with the aim of delivering a balanced, reliable LS swap in classic GM trucks. The wide coverage of engine and chassis combinations makes YZQPNB a practical choice for enthusiasts pursuing a comprehensive LS swap strategy across multiple model years.
Energy Suspension 3-1151G Motor Mount for LS1
Energy Suspension’s 3-1151G motor mount for LS1 engines focuses on polyurethane Hyper-Flex performance. The Hyper-Flex line is known for durability and resistance to undercar chemicals such as oils and coolants, as well as UV exposure and pollutants. While not limited to square-body swaps, these mounts are often used in performance LS builds where longevity and consistent performance under heat and torque are priorities. The Hyper-Flex design aims to outlast rubber by a significant margin, providing a long-lasting upgrade that is commonly chosen by enthusiasts seeking improved throttle response and reduced wheel hop in high-torque applications. Energy Suspension emphasizes value through performance gains and reliability over rubber counterparts.
Users should note that this particular product line is part of a broader ecosystem of Hyper-Flex components, which may be used in conjunction with other LS swap mounting hardware. While it’s not a complete mount kit by itself, it serves as a key piece for builders who want to upgrade specific mount components to improve overall system stiffness and longevity when swapping LS engines into square-body or OBS trucks.
IRENPORU LS Swap Motor Mounts
IRENPORU’s LS Swap Motor Mounts focus on adjustable engine placement for 1973–1998 OBS and square-body Chevrolet/GMC trucks, covering both 2WD and 4WD configurations and the full C/K truck lineup. These mounts support a broad array of LS engines, including LS1/LS2/LS3/LS6/LS7/LS9 and the common truck variants from 1999–2013, such as 4.8L/5.3L/6.0L/6.2L, with LSX LM7 LR4 LQ4 LQ9 L33 LH6 L92 L76 L99 L96 L82 L83 L84 L86 L87. The design emphasizes adjustable fitments to accommodate various transmission combinations and a forward engine shift to maximize clearance and driveline alignment. This makes IRENPORU a flexible option for builders tackling LS swaps in classic GM trucks, especially when the project calls for precise engine positioning and dependable mounting support.
The mount kit’s construction and engineering aim to deliver consistent performance under high-torque conditions, with attention to reducing vibration transmission and enhancing reliability during long-term use. Builders seeking a balance of compatibility, adjustability, and durability may find IRENPORU mounts well suited to their swap projects.
Buying Guide: Key Considerations for Square Body LS Swaps
- Engine compatibility: Confirm which LS variants are supported (LS1/LS2/LS3/LS6/LS7/LS9 and truck LS engines) and ensure the mounts accommodate your specific engine family and year range.
- Transmission pairing: Check whether the mounts support your intended transmission (4L60E, 4L65E, TH350, TH400, TH700R4, 4L80E, etc.) and whether any additional adapter components are needed.
- Chassis fitment: Verify fitment for your specific square body or OBS truck (C10, C20, C1500, C2500, C3500, K1500, etc.) and confirm wheelbase and body clearance to avoid contact with headers, steering components, or the firewall.
- Adjustability: Look for slotted or adjustable mounts that facilitate engine positioning to optimize transmission alignment, driveline angles, and accessory clearance.
- Materials and durability: Prioritize mounts built from carbon steel or reinforced alloys with protective finishes to resist rust and withstand high torque, especially in performance builds.
- Installation approach: Consider whether a kit preserves factory geometry (e.g., crankshaft/bellhousing locations) or requires selective tunnel or crossmember modification. A kit that minimizes fabrication can save time and effort.
- Brand and support: Opt for established brands with documented fitment for square body and OBS platforms and clear installation guidance to minimize troubleshooting during the swap.
- Cost versus benefit: Weigh the benefits of adjustable mounts, material quality, and ease of installation against price to determine the best value for your build.
When planning a square-body LS swap, aligning the engine, transmission, and driveline is essential for performance and reliability. The five products listed provide a range of approaches—from plug-and-play options that maintain factory references to fully adjustable systems that prioritize precise positioning. Evaluate your chassis year, engine family, intended use, and degree of fabrication you’re willing to undertake to select the best mounting solution for your project.