Locking Trans. Dipstick & Tube - TH400

The ATI Performance Locking Trans. Dipstick & Tube for TH400 transmissions is purpose-built for serious drag racers, street performance builders, and high-horsepower applications where transmission fluid monitoring under extreme conditions is critical. Unlike conventional dipsticks that can vibrate loose or shift during hard acceleration and cornering, this locking design prevents accidental removal and fluid loss during competition or street abuse. Built by ATI Performance, a trusted name in transmission technology, this trick stick addresses a real problem faced by builders pushing TH400 transmissions beyond stock parameters.

The Locking Trans. Dipstick & Tube features a solid steel construction with cadmium plating for corrosion resistance and durability in harsh engine bay environments. The 20-inch tube length accommodates deep-sump pans and modified transmission housings common in race and turbo applications, while the integrated locking mechanism securely fastens the dipstick in place, eliminating the risk of vibration-induced ejection. This design maintains accurate fluid-level readings even during sustained high-RPM operation, ensuring transmission protection when coolant circulation and fluid viscosity matter most. The cadmium finish protects against oxidation and heat degradation, extending service life in aggressive builds.

This locking dipstick is ideal for TH400 owners running heavily modified engines, competitive drag racing, or street performance vehicles with turbochargers or superchargers where transmission temperatures and vibration exceed factory tolerances. Installation requires basic transmission pan removal and fitting into the existing dipstick tube boss; no modifications to the transmission case are necessary. Compatibility is specific to TH400 applications; verify your transmission model before ordering to ensure proper fitment and function.