Steering wander can be caused by: worn crossply tyres, worn wheel bearings, slack steering box adjustment, worn steering idler bushes, worn rubber suspension bushes, worn kingpins, worn steering rod ball joints, loose steering wheel, steering box mounting cracking, corroded front cross member, steering idler mounting crackings, soft radial ply tyres, loose damper bolts, general wear inside the steering box, and even a broken rear leaf spring, but you will have heard the loud crack I hope!
Difficulty keeping in a straight line is usually poor wheel alignment, get the tracking set correctly. High winds from the side, on motorways, will cause cars such as ours to wander.
If you drive too fast for the chassis, in a rather sporting manner, you will get rapid wear of the outer edge of the front tyres. This is caused by the models understeering characteristics.
Wear on the inside edges of the tyres with worn kingpins is similiar to too much toe out. (The wheel leans in more at the top with worn king pins).
Stiff steering is caused by soft radial-ply tyres, siezed up steering idler, seized kingpins, ball races breaking up inside the steering box, over adjustment of the steering box adjuster. Turn it until it stops Notchy steering is caused by the worm inside the steering box having excessive wear, usually in the straight ahead position, caused by over adjustment. The box is now only fit for scrap.
Shimmy, the steering wheel shaking at speed, is often just a wheel out of balance, but it can be worn out damper, worn out ball joints, worn steering box and king pins, a buckled wheel rim, or any combination of any of them.