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I've noticed something that seems to be related to the engine/trans tilting forward. Background: My '67 f100 2wd has a 390 with the column-shifted 3 speed manual. When letting off the clutch to get rolling, the engine/trans tilt forward very slightly, which pulls the throttle open. I know this because I removed the hood and drove the truck with a buddy hanging out the window watching the air cleaner. The problem was much worse before I replaced the transmission mount, as there was more movement. It was bad enough to cause the truck to lay rubber unintentionally. With the new mount it's not so bad, but it still happens. The mount is brand new, and passes the jack-the-rear-of-the-transmission-up test. No separation or significant movement when you do that. I have jacked up the engine as well, and there's no real raising up of either side of the engine then. At this point, I'm figuring that the rod-style throttle linkage is just hyper sensitive to engine movement because one end of the rod is hooked to the firewall. It seems a cable setup would completely eliminate this problem. Do the rest of you folks have this problem, or is there something weird going on with my particular truck?
If the “trapeze “ linkage is still mounted it is not adjusted correctly. Most people convert to a cable style from a later model truck. Probably your best move.
There's just a rod sticking up kinda parallel to the firewall, apparently directly connected to the accelerator pedal. Hooked to that rod is another rod that goes from there straight forward to the throttle arm on the carburetor. What truck do I need parts from to convert, and what years of truck can they come from?