Choosing a torque converter for a 350 turbo-equipped vehicle requires balancing stall speed with daily drivability. The following selections focus on TH350 non-lockup converters that suit street, mild performance, and occasional track use, helping you optimize launch without sacrificing everyday driveability. Each option is evaluated for compatibility with 1969–1979 GM TH350 applications and typical 350 engines in American builds.
| Product | Brand | Approx. Stall | Notes |
|---|---|---|---|
| TO-GM350 TH350 Non-Lockup Torque Converter | Generic | Stock Stall | 3 brackets, 30 spline |
| MX-C9HS-26 TH350 Non-Lockup Torque Converter | Generic | 2000-2600 | 12″ diameter, 30 spline, 3 bracket |
| ALL26906 12″ 350/400 Torque Converter | Allstar Performance | 2200-2600 | Remanufactured core, new hubs |
| JEGS 2300-2700 RPM TH350 Converter | JEGS | 2300-2700 | 10.75″ bolt pattern, 500 HP |
| JEGS 2700-3000 RPM TH350 Converter | JEGS | 2700-3000 | 10.75″ bolt pattern, 500 HP |
TO-GM350 TH350 Non-Lockup Torque Converter
The TO-GM350 is designed for TH350 transmissions used in 1969–1979 GM suspensions. It features a stock stall profile suitable for street-driven 350 engines with mild modifications. With three mounting brackets and a 30-spline input shaft, it aims to deliver reliable engagement and consistent performance in everyday driving and light performance scenarios.
MX-C9HS-26 TH350 Non-Lockup Converter
MX-C9HS-26 is a 12-inch non-lockup torque converter rated for 2000–2600 RPM stall speed. Its 30 spline input and 10.5-inch bolt-circle fit a range of GM TH350 builds and 1969–1979 combinations. This option balances performance with daily drivability, suitable for moderate street and drag-strip use with cam-driven engines.
Allstar ALL26906 12″ 350/400 Torque Converter
Allstar ALL26906 is a 12-inch diameter converter designed for 350/400 trans, with an emphasis on reliable street and mild drag racing capability. It’s remanufactured with new pump drive hubs and thrust washers. Stall speeds vary with engine displacement, torque, and vehicle weight, making it a flexible option for diverse builds.
JEGS 2300-2700 RPM TH350 Converter
This JEGS unit targets street and track use, offering improved launches and acceleration. It’s USA-made with quality materials, featuring a 2300–2700 RPM stall speed intended to match typical engines and cam profiles used with a 350 turbo. It provides a balance between performance and cost.
JEGS 3100-3500 RPM TH350/TH400 Converter
Designed for higher-performance builds, this JEGS converter targets conversions for 3100–3500 RPM stalls. It suits engines with aggressive cams and higher torque peaks, providing firm engagement and a robust launch profile for race-inspired street use. Made in the USA with attention to material quality and assembly.
Buying Guide: Key Considerations for TH350 Converters
- Stall speed vs. engine setup: Select a stall range that complements your cam, compression, and torque curve. Lower stalls (2000–2600) suit mild builds; higher stalls (2700–3500) suit aggressive cams and higher torque.
- Application and fit: Confirm spline count (usually 30), bolt pattern, and diameter. A 10.75″ flexplate bolt pattern is common for many TH350 builds; ensure bracket mounting and overall fit within the transmission tunnel.
- Street vs. track emphasis: Street-oriented converters prioritize smooth engagement and low torque loss; track-focused units emphasize quicker rev drops and higher stall for launch.
- Remanufactured vs. new: Remanufactured units can offer cost savings but vary in consistency. Newer units may provide more uniform performance and longer life.
- Build compatibility: When pairing with a 350 turbo, factor in boost from exhaust, intake, rear gearing, and differential to avoid stalling too early or too late.
- Quality and sourcing: Choose reputable brands or suppliers with clear specs, warranty options, and documented testing procedures to ensure reliability.
- Return policy and installation: Check compatibility notes for TH350 variants and confirm that installation hardware and flexplate are compatible with your vehicle’s specific year and model.
- Maintenance implications: Torque converters can affect fluid demands, heat generation, and transmission longevity; ensure cooling and fluid changes align with your use case.
In summary, the options listed provide a spectrum from stock-styled performance to higher stall figures for cam-driven engines. The right choice depends on your driving profile, engine setup, and whether you prioritize street manners or race-ready launches.