I did the same on my 91 AT ... I contacted Touratech and they recommended the heaviest spring rate. Remember these guys might be expensive but for these issues they do have plenty of experience. I simply fitted it onto my old shock, taking the time to clean everything and check for leaks.
OK so I rode my bike fully loaded with my wife on the back, no problems at all, she even commented it was far more comfortable than on the standard unit with the bike unloaded. I also fitted worth front springs and again TT recommended oil weight...
Incredible difference, but of course someone would agree the old parts where indeed old and its all new !!
Hope this helps a little
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