The Ford Barn - View Single Post - where can i find a 40 ford tourqe tube speedo drive for 325 gear ratio

drolston · 07-14-2018, 10:31 PM

The more the teeth on the driven gear, the larger diameter of the gear. The different housings set the axis of the gear at the right height to engage the worm gear on the drive shaft. From experience, if you put the 17 tooth gear in anything bigger than an 18 turtle housing the teeth will skip and quickly wear out. I went from 3.78 rear end to 3.25 and had to use the 18 housing with the Braxton 17 tooth gear. They do not make a housing specifically for 17 tooth gears, but the 18 housing is working fine now.

07-14-2018, 10:31 PM	#4
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: where can i find a 40 ford tourqe tube speedo drive for 325 gear ratio The more the teeth on the driven gear, the larger diameter of the gear. The different housings set the axis of the gear at the right height to engage the worm gear on the drive shaft. From experience, if you put the 17 tooth gear in anything bigger than an 18 turtle housing the teeth will skip and quickly wear out. I went from 3.78 rear end to 3.25 and had to use the 18 housing with the Braxton 17 tooth gear. They do not make a housing specifically for 17 tooth gears, but the 18 housing is working fine now.