Billet Aluminum Instant Reaction Trans Brake Kit w/ Internal Dump For 1-1/4" Input Shaft

BILLET ALUMINUM INSTANT REACTION TRANS BRAKE KIT W/ CLEAN NEUTRAL AND LOW BAND APPLY (PR/N123N), W/ INTERNAL DUMP FOR 1 1/4" INPUT SHAFT. (INCLUDES PUMP COVER ASSY. W/ ADJUSTABLE REGULATOR, FITTINGS AND HOSE)

REQUIRES P08-408/P08-458 SHIFTER (MUST BE USED WITH BILLET ALUMINUM DIRECT DRUM COA-22814/COA-22815)

The Coan Racing COA‑22027‑AL‑ID‑1.250 Billet Aluminum Instant Reaction Trans Brake Kit is a top-tier hydraulic solution engineered for Turbo‑Hydramatic 400 transmissions that employ a robust 1 1/4″ input shaft. Meticulously crafted from precision billet aluminum, this valve body upgrade follows the reverse PR/N123N shift pattern and seamlessly integrates instant trans‑brake control in first gear with a supplementary low‑band apply feature, allowing for exceptionally smooth and repeatable launches. The kit’s inclusion of a “clean neutral” safety position offers secure and reliable neutral holding between runs, essential for staging and shutdown reliability.

What sets this version apart is its built‑in internal dump circuit, specifically designed to manage excessive hydraulic pressure in systems using the larger 1 1/4″ input shafts. This internal bypass protects the shaft seals and ensures hydraulic stability under extreme launch loads. The package also includes a pump cover assembly with an adjustable pressure regulator, along with all necessary fittings and hoses to support precise pressure control and seamless hydraulic plumbing, delivering a clean, integrated setup ready for high-performance conditions.

To install correctly and operate as intended, the kit must be used alongside a Precision P08‑408 or P08‑458 shifter and Coan’s billet aluminum direct drum (COA‑22814/COA‑22815), ensuring accurate shift positioning and compatibility with the clean-neutral and low-band functions. When mounted in the stock valve body bolt pattern, it provides racers with a compact, bolt-in high-performance hydraulic system that offers lightning-fast trans-brake response, improved launch consistency, and enhanced protection for critical transmission components, ideal for bracket, heads-up, or high-torque applications.