Seller notes

Fits GM 4T65-E Transmission Sonnax Boost Valve Kit Symptoms:Harsh ReverseLow line rise in ForwardLow line rise in ReverseSoft upshiftsCause:Bore wear near the small valve causes harsh or delayed reverse depending on the location and severity of the leak, and the temperature wear near the end plug causes soft shift quality and lowline rise.Correction:The replacement boost sleeve delivers oil 360° around the valve, reducing side load. Also the surface contact of the spools is greater, which impro...

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