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RE: Yes that is true........ By ED - 10/22/2003 5:39:05 PM; IP 12.215.50.36 Well...... The final drive ratio would be the same as if you reduced the diff gear ratio by 27% and did not have the overdrive. The real advantage to overdrive is that you can run a lower rear end gear for acceleration and torque and end up with a higher final drive for cruising.... Using your 27% overdrive and adding a 27% lower rear end gear, you will basicly have a 27% lower final drive for for 1,2,3 and a 27% higher gear for highway or cruising. (Most factory overdrive systems do not kick in until 4th or 5th....) But for most aftermarket add on over drives your final drive ratio can be reduced at almost any time. Most people compensate for the over drive by adding lower gears to the diff. So in answer to your question: Yes, When the over drive is on you will have a lower engine RPM.

This thread, so far...

Skip Navigation Links.  Power Curves and Overdrive -- allan, 10/20/2003  Not a good article -- Lou, 10/20/2003  RE: Not a good article -- allan, 10/20/2003  Sounds good on paper, but you are lugging -- Lou, 10/20/2003  Yes that is true........ -- Ed Jenkins, 10/21/2003  RE: Yes that is true........ -- allan, 10/22/2003 RE: Yes that is true........ -- ED, 10/22/2003  RE: Power Curves and Overdrive -- giacamo, 10/22/2003  RE: Power Curves and Overdrive -- allan, 10/22/2003  Math time !! -- Lou, 10/23/2003  RE: Math time !! -- allan, 10/23/2003  RE: Math time #2 -- Lou, 10/23/2003  RE: Math time #2 -- allan, 10/23/2003

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