UMI Performance 2218-B Tunnel Mounted Torque Arm & Crossmember Kit TH400 Black

The UMI Performance 2218-B is a tunnel-mounted torque arm and transmission crossmember kit engineered specifically for TH400 (short tail only) transmissions. Because the TH400 lacks provisions to mount the factory torque arm to the transmission tail shaft, this kit relocates the front mounting point to a dedicated tunnel-mounted crossmember — eliminating tail shaft stress and making the TH400 swap a complete bolt-in installation with no welding or drilling required.

The kit includes two pivot bracket positions for on-car instant center adjustment. By repositioning the torque arm, you can fine-tune the instant center point of the vehicle — a critical tuning advantage that can directly reduce 60-foot times, especially on low- to mid-horsepower builds.

Construction & Materials:

• Torque arm constructed of 1.250" x 0.120" DOM seamless steel tubing
• Front crossmember uses 0.120" x 3.000" rectangular steel tubing
• TIG welded 4140 chromoly steel tube adaptors
• On-car adjuster built from 4140 chromoly steel, heat treated for maximum strength
• Mounting plates CNC machined from 0.188" thick mild steel with metric Grade 10.9 hardware
• Torque arm pivot plates use 0.250" thick mild steel with Grade 8 hardware
• Rear mounting plates use 0.375" thick CNC machined mild steel, drilled for stock, 12-bolt, and 9" rear-end housings
• Rear mounts feature solid QA1 3/4" rod eyes attached with Grade 8 hardware
• Front pivot mount supplied with Grade 8 hardware and locking nuts
• All mounting plates CNC machined for hole-to-hole accuracy
• Durable black powder coat finish

Bushing & NVH Details:

• Energy Suspension polyurethane bushings on both the crossmember and torque arm mounting points
• All polyurethane bushings are greaseable to minimize road noise and extend bushing life
• Bushing design absorbs road irregularities and reduces unwanted clunks

Performance Benefits:

• Removes torque arm from transmission tail shaft, protecting transmission from damage
• Eliminates wheel hop and improves traction
• Reduces front-end nose dive during braking
• Allows on-car pinion angle adjustments
• Two instant center adjustment positions for tunable performance

Hardware Note: When installing this torque arm on a stock rear-end or similar straight-through bolt designs (such as Strange), a Rear Torque Arm Hardware Kit is strongly recommended, as OEM torque arm bolts are slightly too short. For Moser Engineering 12-bolt rear-ends, reuse the hardware supplied by Moser. The Rear Torque Arm Hardware Kit is recommended for use with the Moser 9" rear-end.

This kit uses existing floor pan mounting holes and installs with basic hand tools — no cutting, welding, or drilling required. 100% USA manufactured by UMI Performance.