February 08, 2017
Allison 1000/2000/2400 units commonly exhibit 3rd Gear starts and trouble codes related to a sticking E-shift valve. The low return rate of the OE spring combined with flashing or wear ridges forming in bore over time allow the valve to hang up, resulting in these concerns. Crack down on sticking valve action by reconditioning the bore and installing stronger Sonnax E-shift valve spring 37000-02.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.