Sonnax (Genuine) Line Pressure Booster (15-30 PSI Rise) 68RFE, 45RFE, 545RFE for Sale


When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Price: $119.33

Chrysler RFE transmissions have a unique, full range pressure transducer and real-time adaptive closed-loop pressure control system. Because of this, it is not possible to raise pressure in an RFE the same way you would in other transmissions. The typical method of installing a stronger pressure regulator spring or larger boost valve will not work because the RFE control module will simply adapt and return pressure to OE specification. An electrical booster option is the only way to raise pressure on an RFE.

Sonnax line pressure booster kit RFE-LB1 is an improved design over a simple resistor circuit. Featuring an integrated chip (IC) circuit and a stronger pressure regulator spring, this new kit delivers 10 psi increase at lower pressure range and 25 psi increase at higher pressure ranges. Only Sonnax line pressure booster kits provide progressive pressure increase which gives you smooth engagements and lower load on the pump at idle, but a greater increase in pressure as the transmission is worked harder.

This kit is ideal for heavy duty and modified vehicles and even stock transmissions when a little extra pressure is desired.

  • Achieve shorter shifts and increased torque capacity without creating low-speed harshness
  • Improved clutch holding capacity for increased durability
  • Progressive pressure increase as driving conditions become more demanding
  • One kit fits both gas and diesel applications


**Note to Buyer**

Thank you buyer, for purchasing from us. Your satisfaction and feedback is a very important part of our business. If you are going to leave anything other than 5 stars please contact us first to give us a chance to resolve any issues you may have with our product. Your satisfaction is our top priority!


Parts Search:


Follow