03TahoeZ71
TYF Newbie
Look in your glove box at the RPO code.I checked my RPMs @ 75mph yesterday, and I noticed that I'm right at 21-2200 @ 75mph (with a true speedo).
Does that tell you that I have 3.73s or 4.10s? (FYI: I have the tow package on a 4.8L)
Thanks again Jay!
GT4= 373's
GT5= 411's