So when exactly did the Pershing get the newer T-84 rubber pad track upgrade from the original T-81 single pin steel tracks?

Did they ever see service in Europe with the newer tracks?

Someone posted a picture of a Pershing with the new tracks late In WWII, so the answer would be yes they were used.

That is interesting I'd love to see it.

It's also apparent that most if not all Pershings were actually completed inside of 1945 and early 1946, with references to 'later production versions' all having the newer tracks.

...ontop of THAT there is footage of the earlier tracks in Korea rolling around.. seems they were still being used!

The T-81s were used in Korea by the USMC's 1st Tank Bn. They received their Pershings direct from the armories while en route from CONUS and those tanks only had the earlier single-pin tracks. These were used by 5th Marines (the fire brigade) in the Pusan Perimeter. Somewhere between ending their assignment in the south and landing at Inchon, 1st Tank Bn transitioned from the T-81s to the T-84s with metal chevrons. To best of my research the Marines never used the rubber chevrons in Korea. Even the M-46s had the metal chevrons.

I'm not sure when the Army transitioned from T-81s to T-84s with metal chevrons to T-84s with rubber chevrons. But, I believe that by the time the Army's Pershings made it to Korea, they had all transitioned to some form of the T-84s.