The Triumph Manual says to remove the swingarm , you don't have to .
1. It's easiest to get the bike up straight on a center stand or whatever instead of leaned over on the side stand .
2. Now remove the seat ,left side cover, the pc of air box that the snorkel goes in ,left exhaust, and chain gaurd.
3. Loosen the Chain
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1949.jpg)
4. Remove this bolt from top of swingarm .
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1951.jpg)
5. And the one on the side , it's a little awkward to get at but doable
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1956.jpg)
6. Now with a pair of channel locks grab it and yank
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1950.jpg)
7. Stick the new one in and use something with a blunt end to tap it home , it;s a tight fit,
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1952.jpg)
8. Check the rub block while you're here
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1953.jpg)
9 . Put everything back together in reverse of how you took it apart.
These are supposed to be replaced every 18 = 24k but I don't think tigger 3 ever got done once cuz it came out in 3 pcs and wasn't much of it under the chain
(http://i231.photobucket.com/albums/ee47/2uoykcuf/repairs/chain%20job/101_1957.jpg)
I replaced mine last winter at 24K miles. I think that interval could easily be doubled without consequence.
I did not remove the swingarm, either.
What kind of shock do you have on that one, Mustang?
This one has a rebuilt SHOWA with a heavier spring .