Hi All,

I have looked but can't find it. I have a 1990 GTO TT. It should have an 18 spline OS and early TC but it currently has the TC with the sight hole which I thought was indroduced 92-93 era which is when they also changed to 25 spline. So does that mean I'm running a 25 spline OS?

According to 3SX


Pics of my TC




Cheers,

Joe