Continued movement of the steel valve within the aluminum bore. Lack of optimal valve and linkage stability creates wear and scoring of the manual valve bore, reducing line pressure in reverse and manual low positions.
The Sonnax oversized hard-coatanodized aluminum valve allows thevalve bore to be refurbished, and has anincreased stem diameter at the detentlever and an additional spool forincreased stability.
There is visible wear in the manual valve bore or a proper vacuum test results in 9" or less.
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