Early A-Body Automatic Transmission Switch

PA65Dart said
Thanks for the input all - I am new to the transmission area
I will research your comments and try to get up to speed
I am not sure what the "tunnel" is". Is that the part that in the engine that the shaft from the transmission goes into?
Like I said, I need to get up to speed
Click to expand...
The tunnel is the part of the floorpan that covers the transmission.
63-66 tunnels are barely big enough for the 904. Later, 67-up ones are designed to clear the 727.
It's an easy graft and makes a huge difference