Thanks gents!
Odd thing about these is, you can't find any data to support a 1999 Titled Tahoe Limited. BUT I was able to have a guy on a GMT400 FB page run the vin and got me the RPO list. It is for sure a Limited. Early production too.
Found the Speedo to be 3 mph off at 75. GPS only read 72. Pulled the tune out last night with HP tuners, but did nothing with it yet. Will have to see if the tire size was changed at some point. It also seems high in the front end, which could support my theory on larger dia tire install..... aka riiiimz
