Product Description The STS Parts 45RFE / 545RFE Transmission Line Pressure Booster Kit is a simple and effective way to enhance transmission performance by increasing line pressure. This plug-in booster modifies the pressure signal sent to the transmission control system, causing the computer to raise line pressure by approximately 15–30 PSI. The result is improved clutch holding power, increased torque capacity, and firmer transmission operation — especially beneficial for performance, towing, or heavy-use applications. The unit installs externally on the transmission for fast installation and easy removal. Key Benefits Increased transmission line pressure Increased clutch clamping force Improved torque handling capability Helps reduce clutch slippage No internal transmission work required Compatibility (Reference Only) Transmission Types: 45RFE, 545RFE Vehicle Makes: Dodge, Chrysler, Jeep Engine Types: Gas & Diesel ⚠️ For use on 45RFE and 545RFE units only. Always verify transmission type before purchasing. Cross Reference Comparable to Sonnax 44957-LB2 (45RFE / 545RFE) Installation Notes Plug-and-play external installation Mounts on the outside of the transmission No cutting or internal modifications required Important Notice ⚠️ For Off-Road Use Only This product is intended for off-road or racing applications and may not be legal for use on public roads in some areas.