C6 Automatic Transmission

DESCRIPTION C6 Transmission

The C6 transmission is a three speed unit capable of providing automatic upshifts and downshifts through the three forward gear ratios. The transmission is also capable of providing manual selection of first and second gears.






Fig. 1 shows the location of the converter, front pump, clutches, gear train and most of the internal parts used in the C6 transmission.






The identification tag (Fig. 2), is attached to the intermediate servo lower front cover bolt. The first line on the tag shows the transmission model prefix and suffix. A number appearing after the suffix indicates that the internal parts in the transmission have been changed after initial production start-up. For example, a PGD-BN model transmission that has been changed internally would read PGD-BN1. Both transmissions are basically the same, but some service parts in the PGN-BN transmission are slightly different than the PGD-BN1 transmission. Therefore, it is important that the codes on the transmission identification tag be checked when ordering parts or making inquiries about the transmission.






The hydraulic control system schematic is shown in Pig. 3. The converter housing and the fixed splines which engage the splined outside diameter of the low-reverse clutch steel plates, are both cast integrally into the case.

Only one (intermediate) band is used in the C6 transmission. This along with the forward clutch is used to obtain intermediate gear.