If you're looking for a good gear shop in Chicago, try Worldwide Transmission at 3746 N. Cicero, phone #773.286-7666. They changed out my stock '99 Cobra 3.27 ratio to a 3.73 and later to 4:10. As I recall, the shop work and materials worked out to about $315 on the independent rear. I put the 3.73s in my son's '88 GT. The live axel swap out is $225. This shop has been in business for about 50 years. They stand by their work and I have been very please with it.
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