Triumph Rigid frame gearboxes 1946 to 1954
Tiger T85, T100, 3T DeLuxe, 5T Speed Twin, 6T Thunderbird, TR5 Trophy, Tiger T110
There seems to be quite a lot of speculation and confusion out there over the gearbox casing cast numbers for post war rigid framed Triumph motorcycles.
I’ve spent a bit of time looking through the Triumph parts lists from 1946 to 1954 as I have a vested interest. I have a few Triumphs from that period and I’d like to make sure that I have the correct gearboxes in the right frames. I also have a couple of Wide Ratio gearboxes and had a Close Ratio one.
Please bear in mind that my source is factory parts lists and nothing else. To add a bit of confusion, in their infinite wisdom, Triumph issued many gearboxes with a cast number “T910” and this number is not listed. So, I will assume that it was a modest upgrade from T909. Feel free to advise me on this as you can’t be an expert in everything.
WIDE RATIO gears
The wide ratio gears that were installed between 1946 and 1949 were as follows:
(These were in direct replacement of their equivalent gear and all the others were standard)
- Main HIGH 27T T465
- Main 2nd 18T T467
- Layshaft HIGH 17T T466
- Layshaft 2nd 26T T468
The wide ratio gears that were installed between 1950 and 1954 were as follows:
(These were in direct replacement of their equivalent gear and all the others were standard)
- Main HIGH 28T T969
- Main 2nd 19T T968
- Layshaft HIGH 18T T971
- Layshaft 2nd 27T T974
Main gearbox casing cast numbers
1946 T264 T264A or T264B
1947 T264 T264A or T264B
1948 T264 T264A or T264B
1949 T264 T264A or T264B
1950 T909 or T910
1951 T909 or T910
1952 T909 or T910
1953 T909 or T910
1954 T909 or T910
1955 T1201 (It changed during 1955 to swing arm type)
Or send me a message if you have a specific requirement
