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MikeJ Offline OP
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While re-building my '68 T120 I stumbled into the dark hole of gearbox selector camplate, plunger, spring and holder changes made during the 1968, 69, and 70 model years. I learn a lot from the forums, so I'm always inclined to pay it back and even forward. I know many will think me crazy for diving this deep, but I do think this is useful information for those who want to try to achieve the best shifting possible from the 4-speed gearbox. My report is a pdf which can be downloaded from Google Drive here: https://drive.google.com/file/d/19TLSiaeshLao7b2yNrk9uFTD8l1qUe7w/view?usp=sharing

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jeez, that's fantastic


now do the five speeds.


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I wonder if there is something like that for the 500 unit.......

Cheers, Wilf


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Wow Mike, very impressive work and very much appreciated.
Cheers,
Bill


'68 Bonnie, '70 TR6r
'74 CL360
trail 70's and minitrails
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Now go into the different gear and shaft types over those years..................

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MikeJ Offline OP
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Originally Posted by NickL
Now go into the different gear and shaft types over those years..................

There is a good wall chart for that (from the factory). Sadly, it does not come with the magnifying glasses needed to read it! I believe both Coventry Spares and JRC offer it to their dealers. I got mine from Dan at Franz & Grubb.

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Great, thanks!


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Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
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A big round of applause for Mike for illuminating several facets of Triumph gearboxes which have long been sources of rolling confusion! Great work, MIke, Congratulations on such a useful outcome of your hard work and dedication!


Bruce Miller
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The Bonnie Ref: https://www.hermit.cc/tmc/om/manual.htm
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Great summary, Mike
Well done and thank you.
Everyone with a Triumph four speed box should have a copy of your summary---saved in their computer or printed off and filed.

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Great work Mike!
I saved it and I don't even own a four-speed.

Somewhere there must be a guide to upgrades to early five speeds which don't involve replacing the whole thing?


Knowledge speaks. Wisdom listens.

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What do you suppose the notches on the cam plate between the gears were for? It would seem to me that it would make it more likely to find a false neutral.

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Originally Posted by Dick Page
What do you suppose the notches on the cam plate between the gears were for? It would seem to me that it would make it more likely to find a false neutral.
Those are just to drive you crazy trying to index the quadrant. Just like the crossover shaft on the T160. laughing


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71 A65L "Zelda"
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MikeJ Offline OP
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Originally Posted by Dick Page
What do you suppose the notches on the cam plate between the gears were for? It would seem to me that it would make it more likely to find a false neutral.
Great question! I wish I knew. I didn't come across any info in my research to answer that. I bet John Healy knows.


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