I drove my car for a year or so with the .430's. Then I switched them for .276's thinking I'd get much better gas mileage and be able to do a little cruising. Since I didn't have the correct speedo gear with the .430's I could only guess at the number of miles I drove but I think my gas mileage went from 6 mpg with the .430's to 6.5 or 7 with the .276's. Paul L. '63 Sport Fury 440/727 http://www.1962to1965mopar.ornocar.org/ml-lennemann63.html ledman_70@xxxxxxxxxxx wrote: > > I did the 3:91 thing in my Polara a few months ago Richard...SCREAMS off > > the line but SUCKS on the highway! Almost 3000rpm at 65 and noisy. Wish > I had gone with the 3:73's, but Summit didn't offer them. > Dove the car to work today and used almost a quarter tank of gas getting > > here...I live 16 miles from work! Man, are you in for a surprise! > Richard Kinsley wrote: > > > > > > > > Rich Kinsley '64 Polara 4 dr 318poly w/goodies > > > > Today I finally decided to quit messing with my car without the right > > rear-end. So I took the 489 to Advanced Driveshaft here in Omaha and > > they are reconditioning it and installing new 3:91 gears. I'm keeping > > the 3:23's for the future when I tame it down to a long haul cruiser. I > > still have the springs and driveshaft to complete and they will be done > > in conjunction with the diff. It will be nice to have the drive train > > finished! Then there'll be no excuses allowed for bad timeslips. > > > > Jeff Adams > 64 Polara ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.