5L40E, 5L50E Sub Piston Kit

The 4L40E, 5L40E, 5L50E transmission have a series of molded pistons in the transmission, you can click here to see an earlier post on the piston kit.

The year group of 1999 to 2001 a sub-piston kit might be necessary. It seems the 4x4 version of the transmission contains a slightly different size in one or two of the pistons and there could be a difference in piston size depending where the unit was manufactured.

Although not necessary in all circumstances it might be prudent to order the sub-kit when ordering the master kit with pistons or the piston kit.

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