If you have a 2.2, 2.45 or 2.76 rear gear an overdrive will be of little use, it will drop the engine RPMs so low that it will be lugging too much -- low engine efficiency and possibly not enough engine power at those RPMs to overcome rolling and wind resistance.

You didn't mention what engine you'll be using, but an A999 (the wide-ratio version of the 904) with a lockup converter would make a good inexpensive match with those highway gears.

What's your goal for the car? Hotrod or cruiser? What's your budget? Give us some more background and we can get more specific. A person can spend a lot of money on fuel-saving components that take too long to pay off.

Last edited by Fury Fan; 08/31/09 04:29 PM.
Parts I seek: driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set 16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better. 69-73 C-body caliper brackets and/or splashields Send a PM.