AODE Archives - Transmission Digest
Direct Clutch Drum & Shaft Kit

Sonnax’s new direct clutch drum ad shaft kit for AODE/4R70W transmissions.

Critical Wear Areas & Vacuum Test Locations

Critical Wear Areas & Vacuum Test Locations

I Lost My EPC!

The AODE/4R70W transmission has a problem with wear in the pressure-regulator-valve bore that can cause a reduction or complete loss of EPC pressure when the unit is hot. This equates to no or minimal line rise, causing the transmission to have medium- to full-throttle slipping in gear and sliding shifts.

Once a pressure gauge has revealed that EPC pressure remains near 0 at any throttle opening (as well as when the transmission is unplugged), the technician usually replaces the EPC solenoid, yet the problem remains.