At the risk of slight thread drift, I attach a drawing of a gearbox I am preparing for publication at the moment, a 4 speed 'silent third' gearbox (I also have a similar drawing showing a 3 speed 'silent second). I also have an image of the 'box from Commercial Motor, also attached. I have spoken to a number of people about these so far, but no one has come up with any form of explanation, plausible or otherwise....
I would value any thoughts....
4speedbox commercial motor.jpg (Size: 83.22 KB / Downloads: 269)
I would value any thoughts....
![JPG Image .jpg](https://www.austinsevenfriends.co.uk/forum/images/attachtypes/image.png)