4R44E Sonnax Boost Valve Kit 37947-03K

Sonnax Boost Valve Kit

Genuine Sonnax Boost Valve Kit for the Ford, Lincoln, Mercury 4R44E automatic transmission. Sonnax parts are the aftermarket standard for transmission repair and performance, engineered to correct common failure points and add durability beyond the original design.

Fitment

Fits 4R44E / 4R55E / 5R44E units. Sonnax part number 37947-03K.

Why Sonnax

Trusted by professional builders and performance shops, Sonnax components are made in the USA to exacting tolerances. This is a direct-fit upgrade for a 4R44E rebuild or repair.

Shipping & Support

Fast shipping and knowledgeable support on every 4R44E order.

Special Order

This Sonnax part is available by special order. Contact us for current price and availability before ordering.