Everything you ever wanted to know about the 140 Power Glide is in Bob Ballew's book on the Power Glide transmission (available from Corvanatics for $10). He also covers in detail the special governors and on page 91 shows how to make a gauge to tell the difference. The 140 governor is "RARE." Apparently, the only place he found all the 140 unique PG parts listed, was in the Canadian parts catalog. Norm Helmkay