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Rpms depends on tire size, diff ratio, and trans ratios. If freeway rpms are a concern, this will help figure it out before you commit to anything: http://webspace.webring.com/people/cz/z_design_studio/

FWIW, I like the close ratio ZX transmissions with a low diff ratio. The ZX's came with a 3.90, so a 4.11 is not bad at all. Bad Dog's idea of lower rpms with the 4.11 and 5 speed is proved by the calculator.

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