I have been quite interested in the overdrive thread as I will be
installing OD on my car this winter. I am curious, though, why my Jeep
with the 4.0 inline 6 cylinder and far worse power to weight ratio doesn't
suffer any ill effects running at 2,000 rpm in overdrive? I have 170K
miles on that lump and don't burn any oil between changes (yearly, whether
it needs it or not). Is it the torque of the engine or some other design
that allows newer cars to tolerate lower rpms?
Bill Lewis
Searching for enlightenment
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