Hey Mate,
I see in your other post you have put V8 hubs on the front...
Have you put V8 draglink/tie rods in when you upgraded your front end? I say this because when I got my car the Mexican I bought it off had put t code steering in (even though my car is a c code) I guess because they had robbed some from another car they had hanging around, as they had no money. Not knowing, I renewed all the ball joints etc to find that it would track and follow lines in the road really badly.
When I finally worked out I didnt have V8 steering, I bought a V8 draglink, tie rods and pitman arm (they are different from t code ones) and it steers really well now! I also put a new (not sure what it is called) stub that the idler bolts to as it was worn a bit, so it had a little play in the idler.
I have manual steering so our situations are not exactly the same, but it may help!
James.