There's no easy miracle cure to boost mileage but reducing the RPM of the engine at highway speed will accomplish that, whether through a "overdrive" type approach on a transmission or a change in rear gear ratio. http://www.mpgenhance.com/differential.html is a link with some examples. Thanks, Gary H. > -------Original Message------- > Hi Gary, > > Not sure - they are 14's in the back - I think they came out of a 71 > dart or scamp - > Can a rear end help that much? This car is revving it at 60 > > Frank Torrano > > 415-583-6986 > ftorrano@xxxxxxxxx > > On Thu, Jun 8, 2017 at 4:40 PM, < > wrote: > > > Highway MPG. ... Before you go through transmission work, do you > > know what gear ratio is in the rear end differential? > > > > Thanks, > > Gary H. > > > >> -------Original Message------- > > > >> I was hoping to find some information on transmission swapping. > > Does > >> anyone know what transmission models I can use on my 64 valiant > > 225 > >> 6cyl push button model? > >> The stock 3 speed is not very efficient at highway speeds. I am > > also > >> looking to keep the push button option so, I would be looking > > for > >> adaptors for it as well. > >> > > -- -- -- Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en. --- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to 1962to1965mopars+unsubscribe@xxxxxxxxxxxxxxxx. For more options, visit https://groups.google.com/d/optout.