UMI Performance 2219AS-B Tunnel Mounted Torque Arm TH400 Adjustable with Driveshaft Safety Loop Black

The UMI Performance 2219AS-B is a tunnel-mounted torque arm kit engineered for the installation of a TH400 (short tail shaft only) transmission into 1982–1992 GM F-Body vehicles. This adjustable system relocates the torque arm's front mounting point off the transmission tail shaft, eliminating a common source of tail shaft damage during high-performance use.

The kit includes a dedicated transmission crossmember with provisions for the TH400, a new shorter-style adjustable torque arm, and a front driveshaft safety loop — making this a complete, 100% bolt-in transmission swap solution requiring no drilling, cutting, or welding.

Key Features:

• Tunnel-mounted design removes front torque arm load from the TH400 tail shaft
• Pivot brackets provide 2 instant center adjustment settings for tunable traction and improved 60-foot times
• Crossmember constructed from 0.120" thick rectangular tubing with CNC machined 0.188" thick mild steel mounting plates
• Pivot plates fabricated from 0.250" thick mild steel with Grade 8 hardware
• Torque arm built from 1.250" x 0.120" DOM seamless steel tubing
• Energy Suspension greaseable polyurethane bushings minimize noise, vibration, and harshness while eliminating unwanted clunks
• Bolts to existing factory floor pan holes — no modifications required
• Includes front driveshaft safety loop for added driver and drivetrain protection
• Finished in durable gloss black powder coat
• Designed and manufactured in Philipsburg, PA — Made in the USA

The adjustable instant center feature is especially beneficial for street/strip applications, allowing quick tuning changes simply by repositioning the torque arm pivot — no tools-intensive modifications required. The greaseable polyurethane bushing setup provides a performance-oriented feel while keeping interior noise to a minimum compared to solid or rod-end alternatives.