I found out today that i don't actually have an AOD tranny. I was removing it from my truck so i could take it in to get it rebuilt and counted the bolts and realized that i have a C6. So my question is the C6 a 3 speed or 4 speed with overdrive being the fourth gear. when i bought the truck i was told it was a AOD and the overdrive didn't work. Just to make sure the C6's have 17 bolts and have a S shape in the pan. The EOD's have a s shape as well but they have 20 bolts.


thanks chris unger

 

It does not have overdrive.

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.

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.

The identification tag 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-JF model transmission that has been changed internally would read PGD-JF1. Both transmissions are basically the same, but some service parts in the PGN-JF transmission are slightly different than the PGD-JF1 transmission. Therefore, it is important that the codes on the transmission identification tag be checked when ordering parts or making inquiries about the transmission.

http://i54.photobucket.com/albums/g91/subford/Transmission/C6Tag.gif

Transmission Identification

C6 = Cast iron case, non-removeable bellhousing, vacuum modulator on right rear, 17 pan bolts.

AOD = No vacuum modulator, has kickdown (T.V.) arm, 14 pan bolts. Has cast pump.

All vehicles are equipped with a Vehicle Safety Certification Label affixed to the left (driver's) side door lock post. Refer to the stamped code in the space marked "Trans." and to the illustration for proper transmission identification.

http://i54.photobucket.com/albums/g91/subford/Transmission/TransmissionID.gif