I have found a 3TA or 5TA bottom half in the back of my garage but cannot identify the gear cluster fitted in it.
I believe it is a close ratio box but the strange part is the sleeve gear and matching pinnion on the lay shaft, they have 26 and 18 teeth which is different to my other similar Triumph boxes where they only have 22 teeth on the sleeve gear. It also has a large 20 tooth gearbox sprocket which leads me to believe it was originally destined for the track.
The profile of the teeth on these two gears is different to the other gears and I believe they are meant as a very high top gear but where did they come from or who made them and what effect would it have on a good condition 500cc top end.
Any info would be appreciated, cheers