JEGS 555-640600 Transmission Crossmember Features:

• This crossmember was designed as a replacement for the factory crossmember, allowing for dual exhaust
• Compatible with the following applications: 1978-1988 GM G-body vehicles, including Chevrolet Malibu, Monte Carlo, Buick Regal and Grand National, Oldsmobile Cutlass, and Pontiac Grand Prix. Will not fit Olds Cutlass Supreme or Chevy El Camino models
• The double-hump design allows for a dual exhaust upgrade
• Manufactured using 1 1/2 in x 2 1/2 rectangular steel tubing with .120 wall thickness
• Black powder-coated steel for strength, great looks, and long life
• A must-have upgrade for transmission swaps

JEGS 555-640600 Transmission Crossmember Notes:

• 1978-1983 G-Body vehicles will require a frame extension for this crossmember to work properly (SEE ITEMS YOU NEED FOR THE FRAME EXTENSION). Some 1983 Hurst Oldsmobiles were originally equipped with a 200-4R transmission and will not require a frame extension. Some 1984 G-body vehicles came with the early (pre-1984) frame and will require a frame extension (SEE ITEMS YOU NEED FOR THE FRAME EXTENSION). If you are unsure, 1984 and later models will feature two mounting locations for the transmission crossmember, the second set of holes are approximately 14 in. behind the front set of mounting holes.
• This Crossmember is designed for the 1978-1988 G-Body that was originally equipped with a small-block Chevy engine and TH350 Automatic Transmission.
• Does not fit Oldsmobile Cutlass Supreme, Chevrolet El Camino, or some Buick Regal Models.
• Engine and transmission swaps may require some additional modifications and fitment of components. Hardware is not included.
• Install this crossmember with the transmission mount facing toward the front of the car. In some cases, floorplan modifications may be necessary.

FAQ

What does a transmission crossmember do?

• A transmission crossmember plays a crucial role in supporting and aligning the transmission in a vehicle's chassis. Specifically, the G-Body TH350 crossmember, part number 555-640600 from JEGS, is designed to provide a secure mounting point for the TH350 transmission in G-Body vehicles. This crossmember helps distribute the weight of the transmission, maintains drivetrain alignment, and reduces stress on mounting points, ensuring proper functionality and longevity of the transmission.

How much power can a TH350 handle?

• The TH350 transmission is known for its robust design and ability to handle moderate to high levels of horsepower and torque. While exact power handling capabilities can vary depending on factors such as build quality, upgrades, and driving conditions, a properly maintained and configured TH350 can reliably handle up to approximately 450 horsepower and 400 lb-ft of torque in stock form. However, performance enhancements and aftermarket upgrades can significantly increase its power-handling capabilities.

Are there different TH350 transmissions?

• While the TH350 transmission has undergone revisions and improvements over its production lifespan, there are not significantly different variations like with some other transmissions. However, there may be subtle differences in internals, valve body configurations, and torque converter specifications between model years and applications. It's essential to select the appropriate TH350 variant for your vehicle's needs, whether it's for a stock replacement or a high-performance application.

What is the length of a TH350 transmission?

• The length of a TH350 transmission can vary slightly depending on the specific model and configuration. However, on average, the TH350 measures approximately 21.75 inches in length from the bellhousing to the tail shaft housing. This compact design makes it suitable for a wide range of vehicles, including G-Body cars. Ensure proper fitment and compatibility by selecting the appropriate G-Body crossmember, such as the G-Body LS swap crossmember TH350, available at JEGS.com.