Just a quick follow-up, I did buy a set of 5 (16 - 20), put in the 18, still about 10 mph off, put in the 19 still off by about 5 mph... finally put in the 20 tooth gear...wheeew, now when my speedo says I am running at 60, my phone app says 58... close enuff for me... just confused about the...

I have a '73 F-250 4-speed manual 4wd 390, with a dana spicer 60 rear end. I was having problems with the odometer reading about 1.75 niles in a 30 mile stretch, but the speedo seemed to be working, so I swapped out the speedo/odometer from a '76 F-150.. the odometer is working now, but...

Hey guys, just wanted to introduce myself... I have a '76 F-150 that I am probly gonna sell or scrap, But recently bought a '73 F-250 hi-boy with a 390 4-speed 4wd.I manage a small motel in northeast AZ up in the high country, most people don't think of Arizona as having a high country, but we...

I noticed the odometer is not working correctly... went out for about a 30 mile drive today and wrote mileage down so i could start calculating my gas mileage and it showed i went maybe 1.75 miles????..the speedometer is working, so I am just wondering if i need to lubricate it or something?