December 25, 2008

Late Model GM 4L80-E Piston Bonding Issue

Some late model 4L80-E pistons have a darker appearance (similar to black oxide) and are not chrome plated in the bore area. Since removing the original friction material by a chemical or water jet process will not provide the surface finish necessary for a good bond, these pistons require machining (resurfacing) prior to bonding.

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