NOS Gm vac modulator 3027222 & 3027842
 

I have these listed over in the 67-72 section but also correct through 1977.
NOS AC Delco vacuum modulator for some T350 and all T400 transmissions.

The lone NOS GM modulator 3027842 is specific to 73-74 C10's as you can read the GM applications.

Here is the info and pictures on the other thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=569948

$60 each shipped