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TEST METHODS FOR DETERMINING ANTI-SHUDDER DURABILITY OF AUTOMATIC TRANSMISSION FLUIDS
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 23, 2007 by SAE International in United States
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Anti-shudder characteristics are an important part of automatic transmission fluid (ATF) performance. Anti-shudder performance has two aspects, initial friction aimed at the prevention of “green shudder” and anti-shudder durability which is the prevention of shudder at high vehicle mileage. Different methods of measuring anti-shudder durability give different results. We have found that some fluids give very acceptable performance when measured in a Low Velocity Friction Apparatus (LVFA) test, such as a JASO M349-2001  , do not give good results when measured in a method that includes high energy engagements and oxidation. This apparent anomaly in test results is due to unexpected behavior of certain fluids after oxidation. The observation is a cause for concern relative to the widely accepted JASO method.
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- Joe Noles - Infineum USA LP, 1900 East Linden Avenue, Linden, New Jersey 07036, USA
- Raymond F. Watts - Infineum USA LP, 1900 East Linden Avenue, Linden, New Jersey 07036, USA
- Masahiro Ishikawa - Infineum USA LP, 1900 East Linden Avenue, Linden, New Jersey 07036, USA
- Hirokazu Saito - Infineum USA LP, 1900 East Linden Avenue, Linden, New Jersey 07036, USA
CitationNoles, J., Watts, R., Ishikawa, M., and Saito, H., "TEST METHODS FOR DETERMINING ANTI-SHUDDER DURABILITY OF AUTOMATIC TRANSMISSION FLUIDS," SAE Technical Paper 2007-01-1974, 2007, https://doi.org/10.4271/2007-01-1974.
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