5L40E Sonnax Boost Valve Kit 55209-04K

Sonnax Boost Valve Kit

Genuine Sonnax Boost Valve Kit for the Cadillac, BMW, GM, Land Rover 5L40E 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 5L40E units. Sonnax part number 55209-04K.

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 5L40E rebuild or repair.

Shipping & Support

Fast shipping and knowledgeable support on every 5L40E order.

Special Order

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