TH350 Locking Dipstick & Tube

The PROFORM TH350 Locking Dipstick & Tube is a precision transmission fluid measurement tool designed for hot rodders, street machine builders, and serious mechanics working with TH350 automatic transmissions. This locking dipstick assembly eliminates the frustration of loose or rattling tubes during high-vibration driving and ensures accurate fluid level readings under all conditions. Whether you're building a custom hot rod, upgrading a classic muscle car, or maintaining a high-performance street machine, a secure dipstick tube is essential for reliable transmission diagnostics and proper fluid management.

This unit features a solid steel tube with black paint finish and a locking mechanism that secures the dipstick firmly in place, preventing tube separation during acceleration, engine vibration, or road stress. The rigid steel construction resists bending and warping that can occur in high-heat engine bays, while the transmission mount design integrates directly with TH350 pan geometry for a factory-correct fit. The locking feature is particularly valuable during dyno testing, drag racing, or heavy throttle driving where engine vibration spikes and g-forces can cause standard dipsticks to work loose, potentially allowing transmission fluid loss or inaccurate readings.

The PROFORM TH350 Locking Dipstick & Tube is the go-to choice for TH350 transmission applications in street rods, muscle cars, performance trucks, and vintage race builds where transmission security and accuracy matter. Its compact 6.75 x 2.75 x 26.25-inch profile fits tight engine compartments while the transmission mount design ensures proper pan clearance and tube routing. Installation is straightforward for any mechanic familiar with TH350 service, requiring no modification to existing transmission geometry and complementing both stock and heavily modified powerplants equally well.