How Feasible Is It?
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
How Feasible Is It?
Down at the junkyard I saw a '68 with an auxiliary tank. How hard would it be to swap it in to my '66 4X4? Would the '68 2 wheel drive have a 34" frame?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
1965/72 F100/250 inner frame rails...behind the cab...are 33 1/2" wide.
Beginning in 1973, all F100/350's have 37 1/2" inner rear frame rail widths, except the following:
1973/77 F250 4WD (High Boys) / 1973/79 F350's on the 140" wheelbase.
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If the '68 F100/350 Styleside has a factory installed (25 gallon) auxillary tank, it will be mounted in front of the left rear wheel, on the inside of the left (drivers) side frame rail.
The fuel cap is exposed, is located (1967/69 *) above the scallop (bumpside) line...almost in a direct line from the in-cab tank fuel cap.
Inside the bed is a shield that protects the fuel filler tube from possible cargo damage.
Some peeps opted to install aftermarket auxillary single or saddle tanks in these trucks. These were usually mounted on the outside of the frame rail, butted up against the bedside.
The fuel cap(s) are either located behind aluminum doors that are riveted to the bedsides, or are inside the bed.
* 1970/72: The fuel cap is located below the scallop line in front of the left rear wheel.
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