4L70E Sonnax Boost Valve Kit 77898E-14K

Sonnax Boost Valve Kit

Genuine Sonnax Boost Valve Kit for the GM, Chevrolet, GMC, Cadillac 4L70E 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 4L60E / 4L65E / 4L70E units. Sonnax part number 77898E-14K.

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 4L70E rebuild or repair.

Shipping & Support

Fast shipping and knowledgeable support on every 4L70E order.