When planning an LS engine swap, choosing the right transmission mounts, crossmembers, and related hardware is essential for proper alignment, fitment, and reliability. This guide highlights five top-rated Trans for LS swap components and related kits that help streamline installation, maximize engine positioning, and maintain solid driveline support. Each product is evaluated for compatibility with common LS engines and classic GM platforms, with an emphasis on installation ease and robust construction.
| Product | Brand | Notes |
|---|---|---|
| Trans-Dapt Ls Engine Swap Mount Kit | Trans-Dapt | Engine mounting pad kit for LS swaps |
| Trans-Dapt Transmission Crossmember for 1982-2004 Chevy S10/GMC S15 | Trans-Dapt | LS swap-ready crossmember for popular S-series trucks |
| Transmission CROSSMEMBER LS Into 78-88 GM A & G-Body Cars | Trans-Dapt | Crossmember designed for A & G-Body LS applications |
| 1955-57 Chevy Tri-5 LS Swap Kit | Speedway Motors | Bolt-in mounts and crossmember kit for Tri-5 |
| Gen III GM LS V8 to TH350/700R4 Trans Adapter | Speedway Motors | Adapter kit with flexplate, bolts, and brackets |
Trans-Dapt Ls Engine Swap Mount Kit
The Trans-Dapt LS engine swap mount kit is designed to provide a solid foundation for a broad range of LS swaps. It focuses on engine mounting points and compatibility with common bolt patterns. The kit’s dimensions and weight reflect a compact, sturdy design suitable for frequent handling during installation. For builders seeking reliable frame anchoring and straightforward mounting, this kit offers essential components to align LS blocks with minimal modification.
Trans-Dapt Transmission Crossmember for 1982-2004 Chevy S10/GMC S15
This crossmember is tailored for LS engine swaps in S10 and S15 platforms, spanning 1982 through 2004. It supports 4L60E and 4L70E transmissions and facilitates direct attachment. The component set is designed to maintain proper alignment and robust support, helping to simplify installation and improve driveline geometry in small to mid-size GM trucks during LS conversions.
Trans-Dapt Performance Transmission Crossmember for 70-81 F-Body LS Swap
This crossmember kit is built for automatic LS swaps into 1970–1979 Chevrolet F-Body platforms. It includes the crossmember, frame bracket, rubber pad, and mounting hardware. The kit emphasizes a black-painted finish and a complete, bolt-on approach to reduce fabrication time while providing a stable support structure for the transmission and engine pairing.
1955-57 Chevy Tri-5 LS Swap Kit
Designed for the iconic Tri-5 Chevys, this kit provides a bolt-in engine mount system and a matching crossmember compatible with TH350, TH400, and 4L60E transmissions, among others. The kit uses a robust 7-gauge steel bracket, 3/8-inch adapters, and polyurethane mounts to minimize engine movement. It aims to deliver a precise fit on classic bodies while enabling an efficient LS conversion workflow.
Trans-Dapt Performance Crossmember for LS Into 78-88 GM A & G-Body Cars
Specifically designed for A-Body and G-Body GM platforms from 1978 to 1988, this crossmember setup pairs with LS engine swaps to deliver reliable mounting points and consistent trans-to-frame alignment. The kit includes crossmember, transmission pad, brackets, and hardware, with a no-drop design to simplify installation while preserving engine and transmission geometry.
Gen III GM LS V8 to TH350/700R4 Trans Adapter Kit
This adapter kit couples a GM Gen III LS V8 with older TH-series automatics, including a flexplate, flywheel bolts, adapter sleeve, torque converter bolts, and engine swap brackets. The flexplate is designed with precise tolerances and high-strength materials to maintain balance and reliability in LS swaps where a traditional automatic transmission is retained. It offers a comprehensive bundle to minimize sourcing steps during installation.
Trans-Dapt Performance 4201 LS Engine Swap Mount Kit
The 4201 LS Engine Swap Mount Kit from Trans-Dapt is tailored for 1967-69 Camaros (F-Body) and 1968-74 Novas (X-Body). The kit includes rubber pads designed to absorb vibration and provide a secure engine mounting solution during LS swaps. It focuses on achieving a reliable, factory-like fit for classic GM muscle cars undergoing modern powertrain upgrades.
Buying Guide
- Vehicle compatibility: Verify the kit is designed for your chassis year range (A-Body, F-Body, S-series, Tri-5, etc.) and LS engine family you plan to install.
- Mounting hardware and hardware quality: Look for complete mounting pads, crossmembers, brackets, and hardware with robust materials (steel, polyurethane mounts) to resist engine torque and vibrations.
- Transmission compatibility: Confirm the kit aligns with your chosen transmission (4L60E, 4L70E, TH350, TH400, 700R4) and includes appropriate adapters if required.
- Ease of installation: Bolt-in designs, pre-drilled frame holes, and included pads or brackets reduce fabrication. Some kits require welding-free installation, while others may need basic modifications.
- Finish and durability: Black-painted or powder-coated components minimize corrosion and provide a clean, long-lasting finish under hood conditions.
- Flexibility and future upgrades: Some crossmembers and adapters offer compatibility with multiple LS variants and older GM transmissions, aiding future upgrades without replacing hardware.
- Support resources: Look for products with clear instructions, installation guides, and availability of replacement parts if needed.
The selections above cover a range of LS swap needs—from engine mounting and crossmembers to adapters for older transmissions. When choosing, consider your vehicle’s chassis specifics, the LS engine family, and the transmission you intend to pair with. A well-matched kit reduces fabrication time, helps maintain proper driveline geometry, and contributes to a reliable and safe swap.