EDIT: Sorry, just re-read your post.
I think these transaxles are setup for acceleration, and track scenarios where fuel economy is not the biggest factor.
You could easily change the ratios to suit your highway cruise needs. I agree that I'll never use 5th gear for acceleration,
and top speed is not very important. I'd probably regear the pinion to a 3.2x, and leave everything else alone.
That would satisfy the highway cruise RPM, and still give you decent acceleration with such a light frame (for LS1 power curve).
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Last edited by 00SS_M6LS1; 11-03-2012 at 03:49 PM..