Dave, unfortunately most tuners are using HP Tuners as their tuning tool and it won't do the correction. For example, both popular tuners from this site, Joe Delano out west and Jeremy from the east coast, use HP Tuners and cannot do the deed. Many that use HP Tuners think that they have the ability to make the change as HP Tuners does have that function and it does work for other vehicles, but it doesn't work for our ECM!
Your best bet is to always ask the tuner what software he's using - if it's HP Tuners you're out of luck. Now if the tuner is using LS2 Edit and is a sharp guy that can figure the tire diameter change needed, you're in luck. So far, just the Brian Herter/Keith Wenzel duo @ PCM4less have been successful.
It appears that this info is "spot on"........Those using HP Tuner cannot do a speedo correction on an SSR. Not only that, even if the (Tuner)has LS-1 and/or LS-2 related software, they likely (cannot do the speedo change either).
Yes, it can be done via LS-1 and/or 2 Edit, but it seems one has to understand the calculations and formula via tire size and gear ration to make it work.
Just spoke with Keith at (PCM FOR LESS) again yesterday, he still has not gotten back his update/modification from the LS-1/2 site to handle my SSR speedo update and any others too. He told me he would call me when he finally got it back. But he was reluctant to press them cause they might delay his "fix" even longer.
Thus, at this date, I'm still in a (wait mode) to hear back and then (re-mail) my PCM and/or ECM if you will...........to Keith to (hopefully) and finally get a speedo that is again accurate.