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Daytona Coupe, 289 and 427 Cobras

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Construction Drawings -
Adjustable A-arm Retrofit

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Package #1 - Daytona Coupe & 289 Cobra Roadster - Adjustable A-arm Retrofit Drawings

Price: US$125

The package consists of approximately 9 drawings. It is applicable to either the 289 Cobra roadster or the Daytona Coupe Cobra.

This set contains fabrication details for new replacement front and rear A-arms that allow the suspension camber of each wheel to be independently and easily adjusted.

These drawings are based on a design using rod ends (i.e. Heim joints) as a replacement for the metalastic bushings of the original Cobra A-arms. The rod ends are mounted in a manner that allows the length of the A-arm to be adjusted; therefore changing the suspension camber. No modifications are required to the original Cobra chassis or it's A-arm mounting brackets to utilize these A-arms.

Benefits of the adjustable A-arms include:

  1. The stock Cobra front suspsension provided positive wheel camber. The revised design provides adjustability in the negative camber range.
  2. The stock Cobra rear suspsension provided negative wheel camber. The revised design provides additional adjustability in the negative camber range
  3. The stock Cobra had no provisions for adjusting camber on either the front or rear suspsension. The revised design allow separate independent adjustment of each wheel over a range of approximately 4.4 degrees front and 4.7 degrees rear.
  4. The revised design A-arms allows camber to be adjusted to compensate for a non-centered spring or misaligned (or damaged) chassis mounting brackets.

The drawings are intended to be used for fabrication of totally new A-arms; however, details are provided for converting original A-arms to an adjustable style.

Full details are also provided for two styles of ball joints; original 1960's style one piece and a new replacement two piece style and their associated housings. The original housing were cast (or forged) steel, but details are included to allow machining replacement housings from a steel billet.

Refer to the Index and Notes drawing below for details (click anywhere on the drawing to open a larger scale PDF version.)

Refer to the Index and Notes drawing below for details (click anywhere on the drawing to open a larger scale PDF version.)



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