1941 Chevy Master Deluxe with bias ply tires.

Car normally drives well and in a straight line. Recently one of the roads by me they paved the sides of the road but not in the middle. Unfortunately the driver side tires line up with the area the old and new pavement meet. The car wants to 'wobble' all over. Going between 35 - 40 MPH when this occurs. Is this the thin bias ply tires or is something wearing out? Only other similar thing I have had like this is going over grated bridges. I do not remember it ever being this bad last year.

Only changes we made to the steering, suspension etc. was to add air to the tires and lube everything.

Bias ply tires are more prone to follow irregularities in the pavement than radials. I have bias ply on my 38. It's just something I have to deal with. When I see an irregular road surface coming up I prepare myself to have to wrangle the car as I drive.

That is kind of what I thought. It is the car's 'personality', not an problem then.

Yes, it is a behavior associated with bias ply tires. The sidewalls are not as flexible as those on radials. So when the tread "grabs" irregularities in the road surface it tends to pull the whole tire and wheel assembly in that direction.

You can reduce thar tendency somewhat by running slightly lower pressures than you might expect. If you look in the operator's manual for your car it would not surprise me to see recommended pressures in the 26 to 28 psi range. I agree it does make it slightly harder to steer but it will ride better and possibly not follow the road surface as much.

Any loosnes, wear or play in the STEERING GEAR OR STEERING LINKAGE CAN MAGNIFY THIS PROBLM.

Common in 1941 is the rubber bushing in the two piece pitman arm bad, steering adjustment loose, or worn out tie rod ends.

The joint in road surface does this, motor cyclists have a big issue with this and has bee known to cause accidents down here.
Tony