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  • Excess total transmission endplay


Worn gear, snap ring, and/or spline


This Sonnax shim allows for adjustment of the total and rear unit endplay. Works with both 3- and 4-tanged thrust washers.

42RE, 42RH, A904

Part No. 12780-Z

Endplay , For 3- or 4-Tanged OEM Washers

Package Quantity: 10

View Instructions

It is often difficult to reduce the total transmission end play in some A904 or A500 transmissions. Excessive total and/or rear unit endplay is often the result of gear, snap ring and/or spline wear. Rear unit endplay is often difficult to reduce with available selective washers. When rear unit endplay is loose, the total unit endplay measurement is also excessive. Sonnax offers a .010" shim, 12780-Z, which is installed between the #9 thrust washer and the rear planetary.

  • Adding a shim or shims between the OE thrust washer and the rear planetary reduces rear unit endplay, which also reduces total assembled transmission endplay.
  • This shim will fit either the 3- or 4-tanged OE thrust washer design.
  • Material: Steel
  • Inner Dia.: 2.000"
  • Thickness: 0.010"
  • Outer Dia.: 2.810"
  • 12780 z