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Many Chrysler A727, A518, A618, A904, 42RH, 42RE, 46RH,46RE, 47RH, 47RE transmissions experience rear servo piston sticking/breakage, pin bore wear, and reverse band slippage. The servo piston has a tendency to get cocked in the bore there is insufficient force to apply the band in a direct line. The high reverse line pressure continues to apply against a cocked piston, causing piston breakage. The bore of the piston also wears from side loading, resulting in insufficient band apply pressure. Sonnax has developed billet aluminum pistons: 22912, 22912A, & 22912B that resist breakage better than the original cast pistons for Chrysler A727, A518, A618, A904, 42RH, 42RE, 46RH,46RE, 47RH, 47RE applications. The seal ridges on the pistons have also been rounded to prevent the piston from sticking in the case bore. The lower piston seal ridge has been made slightly smaller to prevent sticking.
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