Line Pressure Booster Kit AODE, 4R70W, 4R75W

Name: Line Pressure Booster Kit AODE, 4R70W, 4R75W
Brand: SONNAX
SKU: 852-4R70W-LB1
Price: 92.03 USD
Availability: InStock

^$92⁰³

Ships on Sep 07, 2026

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Ford

Line Pressure Booster Kit

AODE, 4R70W, 4R75W

Valve
Sleeve
Pressure Regulator Spring

Line rise control in the AODE/4R70W is different than in most units. Forward pressure is controlled by EPC oil reacting directly on the spring end of the PR valve. The OE boost assembly only increases pressure in reverse. Traditional use of a larger ratio boost valve to increase line pressure has not been an option for this unit. Sonnax has created a specially designed boost assembly that introduces a supplemental boost valve to augment line rise in forward ranges. Like other Sonnax line pressure booster kits, this special boost valve adds EPC reaction area, providing higher pressure incrementally and when it is needed the most. Combined with a spring that is approximately 10% stronger than OE and more conservative in impact than other aftermarket kit springs, this unique Sonnax booster kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket kit springs.

Achieve shorter shifts and increased torque capacity without creating low-speed harshness
Improved band and clutch holding capacity for increased durability
Progressive pressure increase as driving conditions become more demanding
All the benefits of increased line pressure without overloading the pump at idle
Simple and affordable drop-in solution with no special tools or reaming required.

Affordable Kit for Big Performance without a Big Price Tag

The larger boost valves and stronger PR springs in Sonnax booster kits raise line pressure the SMART way by controlling pressure increase progressively with the demand of driving conditions.

Simple, affordable parts require no special tools or reaming to install.
Slightly stronger springs provide a modest base line pressure increase. Unlike other, stronger aftermarket springs, Sonnax springs won't overload the pump at idle.
Larger boost valves deliver demand-based line rise without low-speed harshness. How Progressive Boost Works:
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The combination of Sonnax booster kit valves and springs gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket kit springs.
The combination of boost valves and springs is the ONLY way to progressively increase line pressure.

Part TypeAuto Trans Reverse Boost Valve

Product LineSonnax Line Pressure Booster Kits

BrandSONNAX

Package Height1.4

Package Width4.8

Package Length6.1

Weight0.1 PG

Part CategoryReplacement Parts

Part FitmentSemi Universal

Vendor Part Number4R70W-LB1

Package Qty1

Package TypeEA

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Please click here to download the instructions PDF file

Some parts are not legal for use in California or other states with similar laws / regulations

Line Pressure Booster Kit AODE, 4R70W, 4R75W

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