I have a Sonnax line pressure booster for gas, 5 speed auto transmissions. I has this on my old 09 Ram before getting my new Ram and it will not work with the 6 speed auto's. It is Sonnax p/n 44957-lb2. it is really a plug and play shift kit to firm up the shifts on the trans.
looking to get $35.00 shipped to a U.S. postal address.
HP Transmission
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Line Pressure Booster
Part No.
44957-LB2
45RFE, 545RFE
Line Pressure Booster
Part No.
44957-LB2
The Chrysler 45RFE, 545RFE and 68RFE use a full range line pressure sensor mounted on the outside of the transmission for "closed loop" line pressure control. Due to this system, traditional methods of raising line pressure by changing the PR spring or valves have no effect. Sonnax electronic line pressure booster kits alter the pressure signal sent to the computer, causing the computer to raise line pressure. Sonnax line pressure booster kit 44957-LB1 (68RFE) has 10-15 psi increase, and 44957-LB2 (45RFE, 545RFE) has 15-30 psi increase.
Higher line pressure increases clutch holding power and torque capacity, but with these transmissions, the increase has a limited effect on shift feel. Changes in shift feel will be noticed mostly under aggressive driving or loaded conditions. This part is ideal for heavy duty and modified vehicles and even stock transmissions when a little extra pressure is desired. No other modifications are required. The line pressure booster kit installs between the pressure sensor and vehicle harness using OE-style sealed connectors. Simply unplug the vehicle harness and reconnect with one of these parts.
The Prescription for Optimum Pressure
Stronger pressure regulator springs raise pressure equal amounts at idle and maximum pressure. Many aftermarket kit springs are a compromise, raising pressure too much at idle and not enough at maximum pressures. Larger boost valves, on the other hand, have a progressive effect on pressure, changing the rate of pressure increase.
The Sonnax large ratio boost valves and stronger pressure regulator springs are designed to work together. This is an ideal combination: smooth engagements and lower load on the pump at idle, but a greater increase in pressure as the transmission is worked harder. For a more in-depth look at raising line pressure, read The Prescription for Optimum Pressure.
Learn More
[ame="https://s3.amazonaws.com/sonnax-dev/uploads/instruction/file/594/44957-LB1_LB2-IN.pdf"]Click here[/ame] to view PDF if instructions do not appear below.
looking to get $35.00 shipped to a U.S. postal address.
HP Transmission
Part No.
44957-LB2
45RFE, 545RFE
Part No.
44957-LB2
The Chrysler 45RFE, 545RFE and 68RFE use a full range line pressure sensor mounted on the outside of the transmission for "closed loop" line pressure control. Due to this system, traditional methods of raising line pressure by changing the PR spring or valves have no effect. Sonnax electronic line pressure booster kits alter the pressure signal sent to the computer, causing the computer to raise line pressure. Sonnax line pressure booster kit 44957-LB1 (68RFE) has 10-15 psi increase, and 44957-LB2 (45RFE, 545RFE) has 15-30 psi increase.
Higher line pressure increases clutch holding power and torque capacity, but with these transmissions, the increase has a limited effect on shift feel. Changes in shift feel will be noticed mostly under aggressive driving or loaded conditions. This part is ideal for heavy duty and modified vehicles and even stock transmissions when a little extra pressure is desired. No other modifications are required. The line pressure booster kit installs between the pressure sensor and vehicle harness using OE-style sealed connectors. Simply unplug the vehicle harness and reconnect with one of these parts.
- Increased line pressure
- Increased clutch clamping force and torque capacity
- Installs on outside of transmission
- Easy plug and play installation
- Patent No. 8,275,530
The Prescription for Optimum Pressure
Stronger pressure regulator springs raise pressure equal amounts at idle and maximum pressure. Many aftermarket kit springs are a compromise, raising pressure too much at idle and not enough at maximum pressures. Larger boost valves, on the other hand, have a progressive effect on pressure, changing the rate of pressure increase.
The Sonnax large ratio boost valves and stronger pressure regulator springs are designed to work together. This is an ideal combination: smooth engagements and lower load on the pump at idle, but a greater increase in pressure as the transmission is worked harder. For a more in-depth look at raising line pressure, read The Prescription for Optimum Pressure.
Learn More
[ame="https://s3.amazonaws.com/sonnax-dev/uploads/instruction/file/594/44957-LB1_LB2-IN.pdf"]Click here[/ame] to view PDF if instructions do not appear below.
