My secondary pump piston was damaged in my 420sel tranny when a spring from the secondary valve body found its way between the gears .Is the secondary pump only used for tow starting or has it anouther function ?Does anyone have a spare secondary pump or piston for a 722 series tranny HELP!
My box is a 722.355 from a 1991 420sel its almost back together with new seals friction plates and rear bearing . Steve.