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JASPER Makes Valve Body Update to Ford 4R70W Transmission

December 22, 2010

JASPER, IN - Jasper Engines & Transmissions has made an update to the valve body of  Ford 4R70W transmissions produced after 2001.

This update centers around the installation of a reinforcement plate where the forward clutch and direct clutch circuits meet.  This allows extra clamping force between the separator plate and the gasket.

Initial problems would include the 4R70W slipping in third and fourth gear, which led to the burnout and failure of the direct clutch.  "What we found was that a reinforcement plate was eliminated on valve bodies produced after 2001," says Mark Balsmeyer, JASPER's Crawford County transmission manager. "This caused a lack of clamping capability between the separator plate and gasket.  The gasket would blow out, allow fluid to leak into another chamber and apply the direct clutch when it wasn't supposed to be applied."

JASPER drills and taps the valve body to accommodate the reinforcement plate, securing the separator plate to the gasket and eliminating the possibility of gasket failure in the affected area.

The remanufactured 4R70W transmission is covered by JASPER's 3-year/100,000 mile nationwide transferable warranty. Full warranty disclosure is available on our website or upon request.
For more information on this and other remanufactured products of Jasper Engines & Transmissions, please call 800-827-7455, or log onto

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