Technical 1940 Ford Rear end to 1928 Speedometer Issue

Hi
i have an issue between my 1940 Ford rear end and my 1928 speedometer and i don't get it.
On the torque tube i have a speedo turtle and that's connected to the speedo via a cable.
when i spin the speedo clockwise (looking at the rear face) with a power drill, speedo shows a speed and odometer counts up.
when i connect it to the cable and drive forward
, speedo stays at zero and odometer counts backwards.
So it seems that the cable drives it in the wrong direction.

was there a change in the cable rotation direction between 1928 and 1940?
thanks
FJ

 

Maybe take the cable off at the speedometer end and see if it even turns.

 

Maybe @e1956v can help.

 

yes cable turns

 

I know that some adapters reverse the rotation,not sure on your application, can you post a pic of cable end/with how it attaches,and a shot of the drive end.? ?

 

I don't have the answer to your question but as I recall from about 2 years ago in my 30 model A speedometer the cable turned counter clockwise looking from the back.


Phil

 

Can you turn the turtle 180 degrees and remount it?

 

If the nut on the turtle is 7/8-18 a 90 degree adapter is available to reverse rotation but they are not cheap. Parts to build them have been on back order because of “supply chain issues “.

 

https://transmissioncenter.net/shop/41-90-degree-reversing-or-opposite-rotation/
https://www.summitracing.com/parts/mcl-512958

 

hey guys
thanks for all the answers! i will test if it is possible to turn the turtle 180 degrees.
i looked at my old ford chassis catalog and maybe i mounted it the wrong way around. i still wonder that it meshes with the gear but let me check..
thanks Jan