XRAY - Model racing cars

I got the car back on the track with the new bearing, all others cleaned and relubed, and it's still there. I had one of the more expierienced guys set the trim and it goes straight at first, but when I punch it getting onto the long straight it drifts to the left still. I checked tweak on the station, toe and steering are good, tried 2 different types of tires just for the heck of it.

Things to check:
Belts, not too tight, not too loose
Pinion centered on spur and not loose same for the spur.
battery pack, not moving around...
Ride height and shocks are all set the same....

Anyone? I rebuilt my diffs, used losi white diff lube, they felt better than using the xray grease, but the pull is still there, its fine from a start but it drifts once up to speed.

A couple of things to check :- are the wheel rims running true, also are the drive shafts free of any float in the front hub bearings that could allow the steering to "wind up" and drift?.
Does the servo momentarily glitch if you run the car on the bench with the wheels free or off when you punch full throttle?.
To be honest, sounds like a radio/ servo fault or you need to fine adjust your steering links for consistent return to centre on your setup system. These types of problems can be a real pain in the rear - took us three weeks to nail down a similar problem. Just one last thought, you havn't got your servo wires near your main motor or power leads have you?
Hope this helps
Phil