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" RFE " Line Pressure Booster

Retail: $74.95
Our Price: $63.88
You Save: $11.07
In Stock
Our Number: S-44957-LB1
Manufacturer: Sonnax
Mfg Part # : 44957-LB1
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"RFE" Line Pressure Booster
Easily Boosts Line Pressure, Made by Sonnax

Numerous customers and transmission shop owners have all claimed this kit brings these trucks to life.
One customer particular installs these into every truck he does, and will not let them leave the shop without it.

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
Pressure regulator spring is optional, and is normally not included in these kits

Easy 5 Minute Install w/o the spring

This Fits All "RFE" Automatic Transmissions Below

45RFE / 45-RFE / 4-5RFE
545RFE / 545-RFE / 5-45RFE
65RFE / 65-RFE
66RFE / 66-RFE

WILL NOT FIT 68RFE Diesel Truck Models - See Part # S-44957-LB2 For Those Applications

Details About This Item From Sonnax

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 is a simple and affordable plug in line and go solution with no special tools.

To find out more about how the kits work, and what results you can expect - see the below sonnax link
Achieving a Progressive Pressure Boost in RFEs

Our Part #       S-44957-LB1
Sonnax Part #  44957-LB1
TS # S72741HA

We would appreciate the opportunity to serve your transmission parts needs ! ! !

Cascade Transmission Parts , Inc.
All Rights Reserved ®

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