rear differential

[feadam]

does anyone know if the original differential in the 427 cars were made specifically for cobras or were they sourced from some other car, also were they all cast iron?

[Tom Kirkham]

The diff used in a 427 Cobra is the same as a diff in a 289 Cobra, Iso Griffo, and Aston Martin. They were all cast iron. The Cobra diff is almost identical to the diff used in a Jaguar IRS. The difference is in the mounting bosses. AC Cars used a Jag diff with custom mounts in the AC MKIV. Most of the diff copies are made out of aluminum. Jerry Hawkridge is making one in cast iron.