Trans Shift Modulator
Thread Starter
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Cargo Master
Joined: Sep 2004
Posts: 2,687
Likes: 6
Trans Shift Modulator
I have a 72 F100 with C6 trans. What is the purpose of the shift modulator? I noticed it is vacuum charged. I think my truck may be sucking trans fluid into the carb. Is this possible, and if so how do I test it?
Post Fiend
Joined: Sep 2004
Posts: 5,231
Likes: 1
From: Near Fresno, California
Modulator sets the shift points - tells the tranny when to upshift. I have heard that people have had this problem with the old C4's, but never seen it. I would look at the inside of the vacuum hose and see if there was any trans fluid in it.
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Cargo Master
Joined: Sep 2004
Posts: 2,687
Likes: 6
Checked it. No fluid in hose. I even disconnected the hose behind the carb and plugged it. Started the truck again and my truck still smokes heavily on 1st start of the day. I've replaced the valve seals. My compression is good I think. One cylinder is 108 and the rest are between 111 and 120. Where is the smoke coming from?
