Line pressure control accumulator pistons are leaky, jammed or bound.
This LPC accumulator piston is made of aluminum to match the expansion rate of the aluminum valve body (OE was steel). The piston restores SLT pressure and dampening. SLT is the boost pressure in this unit.
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.
December 22, 2014
Topics: Diagnostics And Theory Shop Practices Rebuilding Tips Vacuum Testing Transmission GM Aisin AW 4L60-E Transmission 55-50SN TransmissionRead Now
Contact a Sonnax Parts Distributor.
Vacuum test at the cover exhaust hole or accumulator entry port is below 18" of vacuum.