4L85E Sonnax Boost Valve Kit 34200-03K

Sonnax Boost Valve Kit

Genuine Sonnax Boost Valve Kit for the GM, Chevrolet, GMC, Cadillac 4L85E 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 4L80E / 4L85E units. Sonnax part number 34200-03K.

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 4L85E rebuild or repair.

Shipping & Support

Fast shipping and knowledgeable support on every 4L85E order.

Special Order

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