* Wheelbase: Econolines came in various wheelbases. Longer wheelbases meant more weight.
* Engine: Different engines added or subtracted weight.
* Options: Features like air conditioning, extra seats (if any were added), heavier-duty suspension, etc., all affected the curb weight.
* Trim level: While less significant than the other factors, even minor trim variations could slightly alter the weight.
To find the curb weight for a *specific* 1978 Ford Econoline cargo van, you'd need to locate its original specifications either from the vehicle's paperwork (like the owner's manual or a build sheet if available) or possibly through a Ford archive (though accessing such archives can be challenging).
