Relentless oscillation of line pressure control valve results in excess bore wear, causing erratic line pressure and/or restricting converter feed oil.
Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized line pressure control valve kit.
Ford 6R140 transmissions may exhibit multiple line pressure and converter-related problems due to excess wear in the line pressure control bore. Wear at the balance spool end allows critical fluid loss, resulting in high line pressure, harsh shifts, and overheating due to reduced cooler/converter flow. Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches.
Reconditioning the bore and installing Sonnax oversized line pressure control valve kit 126740-08K restores hydraulic integrity for proper line pressure control and improved shifting in all ranges.
May 26, 2015
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November 24, 2015
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September 30, 2005
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Contact a Sonnax Parts Distributor.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected. For accurate vacuum testing results, drop 1/8" dia. checkball in front of valve (bottom of bore) before testing. Ensure checkball is removed after testing!