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IFS: Make Your Own

Although the Mustang II is not the best layout for competition, it is a tried and true geometry for thousands of street rods and hundreds of thousands of highway miles. Many manufacturers have all of the parts needed (spindles, brakes, springs, sway bars, etc.) Of course, we hope you will use some Welder Series parts in your design.

The upper arm pivot points are shown as 29-1/2” apart. The stock upper arms adjust in slots, so this dimension is not absolute. It is a starting point, and one that can be used when the upper arms will use threaded adjusters to dial in the alignment.

The side view shows the upper arm pivot center line at the front, the center, and at the back. These dimensions will give the stock Mustang II anti-dive angle of 4 degrees.

1974-78 Mustang II stock upper control arms measure 8″ from the cross-shaft center-line to the center of the ball joint. Note that this is the center of the cross-shaft bolt hole, not the center of the dog-leg in the cross-shaft.
Stock lower arms measure 13-1/4″ from the pivot bolt center-line to the center of the ball joint.

Several builders have made their own I.F.S. using Welder Series’ Mustang II crossmember parts
(14373, 14375 & 14306) and 21902 or VersaTabs (20493) for their upper arm and coil-over mounts. Upper and lower arms can be made using 108211 ball joint housings and Welder Series urethane bushings and adjusters.