Thread: Info Please - Rear Axel Ratio
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Old 02-13-2008, 01:02 PM
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Join Date: Jun 2007
Location: Santa Rosa, CA
Cobra Make, Engine: SPF #633, 351w stroker, Tremec 3550
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Default Info Please - Rear Axel Ratio
I'm a third owner of a MkIII SPF, Number 633, completed in 1999. I've looked over all my owner literature and cannot find what the standard or "default" rear-end ratio was for that series. The owner's manual says I have a Ford 8.8differential. The first owner installed the 351W and Tremec 3550. The SPF invoice does not give any info in this regard.

Stenhouse's gearing calculator indicates that the ratio could be any of seven, the lowest being 3.08 and the highest being 4.56. Any suggestions? Thanks.
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