Question about 1984 Ford F 150

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1984 F150 Transmission Issue

I have an 84 f150 302 w/AOD tranny. Problem free until the muffler started crumbling in the driveway. So the kid in me decides to get true duals put on it. Sounds great by the way. The day after I brought it home from the muffler shop, the transmission shift points mysteriously change. I need to be on the gas to get the tranny to shift from first to second and then second to overdrive. I dont have a tach, but if I had to guess it normally shifted around 3000 rpms, now more like 4500rpms. I thought I stumbled into the answer on this post while searching another similar post, but when I go to look for a vacumn powered tranny control module on my c6, it isn't present. Then I realized that it is probably electronically controled since the vacumn line is not present. Thanks for any help in the resolution of my problem. John

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  • John May 19, 2009

    I checked and rechecked for burned, crushed, and broken wires or vacumn lines around the area where the exhaust was installed. I am not able to find anything that stands out. I would like to know how to identify the shift controlling mechanism. Is it mechanical or electrical? I feel strongly that it isn't vacumn related because there is no control switch on the tranny like in the shop manual, and the truck runs perfectly at idle. Is there a possibility the exhaust shop did not disconnect the battery when they welded up the exhaust and possibly burned up something electrical? It is carbuerated and basically dead stock with 70,000 original miles.

  • John May 20, 2009

    Problem solved, thanks for the good advice motor1258. I was able to look at the manuals specific to the ford AOD transmission and understood that my shift points for the tranny were not vacumn controlled or electronically controlled, but the were mechanically controlled. Once I put my hands on the linkage, I was able to determine that the exhaust guy pulled the linkage off of the carburator without knowing he did. I am totally stoked that I was able to fix it myself. Thanks again, John

    KEN LaPOINT May 11, 2010

    Jack up the truck, and get underneath and look for disconnected vac hose, disconnected control wires to the tranny, burned, singed, cut wires on the wire harness where installation of a dual exhaust may have interfered with the existing system..
    Also check along the vac lines to make sure there isn't a cut, burn, worn spot..
    How's the engine running at idle? if there's a vac leak it can run rough or a little fast on rpm...
    Let me know if you find anything..



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If it's carbureted, there is adjustment at both places, carb & tranny that can be done, and it's a good possibility you bent or banged one of the linkages while doing your exhaust.

Posted on May 19, 2009

  • Mike Butler
    Mike Butler May 19, 2009

    If it's a carburetor, you follow rods down from throttle linkages on side of carb to transmission, that's where you'll find your adjustments.
    Do yourself a favor & go to ( and sign up for free, and then search manuals specific to your vehicle. Go to "view repair guide, then pick "drivetrain" then "automatic transmission". Lots of pictures & good explanation for you.

  • Mike Butler
    Mike Butler May 20, 2009

    Thanks for getting back to us John, always good to hear It's fixed & You were able to do it. Thanks for taking time to do the rating also.



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