The Ford Barn - View Single Post - speedo gear-in tranny

55blacktie · 11-17-2021, 12:38 PM

The 55-56 transmissions use the same type gear, gear drive, and cable. The 57 transmission uses the new style gear and cable. If you go to ant Tbird supplier's website, you will see the different styles. Regardless of year/style, yes the gears are color-coded. It seems that most speedometers are off by 10-15%. My 55 Tbird/w FOM and original 3.31 gears showed 65 mph at approximately 55. The 205/75R15 tires contributed to the inaccuracy, having a smaller diameter than the original 670/15 tires.

11-17-2021, 12:38 PM	#5
55blacktie Senior Member Join Date: Aug 2020 Posts: 442	Re: speedo gear-in tranny The 55-56 transmissions use the same type gear, gear drive, and cable. The 57 transmission uses the new style gear and cable. If you go to ant Tbird supplier's website, you will see the different styles. Regardless of year/style, yes the gears are color-coded. It seems that most speedometers are off by 10-15%. My 55 Tbird/w FOM and original 3.31 gears showed 65 mph at approximately 55. The 205/75R15 tires contributed to the inaccuracy, having a smaller diameter than the original 670/15 tires.