Confused about TT Ruckstell Gear Ratios
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Humblej
Topic author - Posts: 1957
- Joined: Sun Jan 06, 2019 12:23 pm
- First Name: Jeff
- Last Name: Humble
- * REQUIRED* Type and Year of Model Ts owned: 1926 Canadian coupe, 1924 TT C-cab, 1924 runabout
- Location: Charlevoix, Mi
- Board Member Since: 2006
Confused about TT Ruckstell Gear Ratios
I am in the early stages of taking apart a TT Ruckstell. With a Ford puller and a bit of coaxing I got the hubs off. Still has the driveshaft and radius rods. I can turn about 8 revolutions of the U-joint to get 1 revolution of the axle. The Chaffin Ruckstell Axle book lists various gear ratios but I am thinking that is ratio of the crankshaft to axle shaft, not the U-joint. So my question, what does an 8-1 ratio of U-joint to axle mean with regards to if this is a low speed 7/1 or a high speed 5/1 TT Ruckstell?
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George House
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Re: Confused about TT Ruckstell Gear Ratios
You have a 7.16:1 TT gear set
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Humblej
Topic author - Posts: 1957
- Joined: Sun Jan 06, 2019 12:23 pm
- First Name: Jeff
- Last Name: Humble
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- Location: Charlevoix, Mi
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Re: Confused about TT Ruckstell Gear Ratios
Thanks George.
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Allan
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Re: Confused about TT Ruckstell Gear Ratios
Jeff, you might be able to confirm the 7.11 gear set by looking at the centre boss on the square cover at the back end of the driveshaft. Most of our Canadian sourced TT's are stamped with a 5 or a 7 to indicate the ratio.
Allan from down under.
Allan from down under.
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Ed Baudoux
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Re: Confused about TT Ruckstell Gear Ratios
Jeff, the spider gears double the reduction, if one wheel is held stationary. Hold one axle from rotating, then count how many turns of the ujoint it takes to make the other axle shaft make TWO revolutions.
Last edited by Ed Baudoux on Sun Aug 06, 2023 7:22 pm, edited 1 time in total.
Grayling Michigan
1927 Fordor
1926 Huckster
1923 TT
1930 Fordor
1930 Tudor
1927 Fordor
1926 Huckster
1923 TT
1930 Fordor
1930 Tudor
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Humblej
Topic author - Posts: 1957
- Joined: Sun Jan 06, 2019 12:23 pm
- First Name: Jeff
- Last Name: Humble
- * REQUIRED* Type and Year of Model Ts owned: 1926 Canadian coupe, 1924 TT C-cab, 1924 runabout
- Location: Charlevoix, Mi
- Board Member Since: 2006
Re: Confused about TT Ruckstell Gear Ratios
Allen,
Looked for a stamping on the driveshaft, couldn't find one.
Ed,
I secured one wheel hub and rotated the driveshaft. I got about 8 1/4 revolutions of the driveshaft to get 2 revolutions of the axle shaft.
I do not know if I am in Ruckstell high or low and didn't want to try to force the shifter lever to experiment. I guess once I have time to take it apart in a few weeks I can count the number of teeth on the worm and I will know for sure what I have. If 8.25/2 means anything let me know.
Looked for a stamping on the driveshaft, couldn't find one.
Ed,
I secured one wheel hub and rotated the driveshaft. I got about 8 1/4 revolutions of the driveshaft to get 2 revolutions of the axle shaft.
I do not know if I am in Ruckstell high or low and didn't want to try to force the shifter lever to experiment. I guess once I have time to take it apart in a few weeks I can count the number of teeth on the worm and I will know for sure what I have. If 8.25/2 means anything let me know.