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The output and reaction planetary pinion assemblies in '99-later 4L80-E transmissions frequently wear out and must be rebuilt or replaced. New replacement assemblies can be costly and the availability of quality aftermarket assembly components is limited. Sonnax offers a replacement parts kit [34880RK], which contains all the components needed to rebuild all four planet pinions in a single output or reaction carrier (planet gears not included). Individual components may also be purchased separately.
Fits '99-later units with wider planet gears. This application can be identified by its planet gear width of.816; a needle roller length of .804; and the PTFE-coated bimetal symmetric thrust washers.