Tahoe 2WD V8-4.8L VIN V (2004)
Phase three will eliminate the oil pump body 0-ring seal groove and the 0-ring seal. Beginning March 2004, a new stamped carrier molded rubber seal
(2) will be used to seal the pump assembly to the transmission case.
The pump sealing surface is now the outer diameter of the pump and the inner diameter (1) of the transmission case bore. Unlike the current 0-ring seal,
which is installed on the oil pump body, the new seal is installed after the pump assembly is properly positioned and torqued in place. Seating the seal is
accomplished when the torque converter housing is installed, which presses the seal (3) into position between the pump and the case bore (1).
As a result of the modified casting and the deeper pump bore machining, the area between the oil pan mounting surface and the pump bore has
decreased. Because of the reduced material in this area (1) it is necessary to use the shorter oil pan attaching bolts (2). Early pan bolts (3), before
November 2002, should not be used with the modified case design, since they are 1.0 mm (0.39 in) longer and could deform the chamfer surface (4).
Service Information
