Alright so I've been through the ringer with this one. My 70 supreme has had just the worst steering for a long time now. I've replaced everything I can think of at this point. Tie rod ends inner and outer, center link, steering gear, went with the Lares quick ratio, tubular controls arms upper and lower from CPP, steering arms to adjust for castor from global west. New rims from Riddler, new nitto nt555g2 tires. New spindles, drop spindles that came with the caliper bracket. New bigger sway bars from UMI front and rear, new links and bushings, tubular arms upper and lower from umi for the rear Etc. Basically every part regarding the steering. Recently driving on the freeway is MUCH better since I replaced my spindles, but now at lower speeds around town my steering is wandering really bad. Im out of ideas. Anyone have any input??

 

What is the exact caster setting? What is the toe setting?

 

Excellent discussion well worth reading:

Does caster change camber on a 71' cutlass

Note the importance of tires in the discussion mentioned by Eric in the discussion/URL link (above). Tires can make a big difference in the equation.

 

Yeah, but the OP's problem is low speed wandering. Increased caster angle primarily helps high speed stability, which he says is fine.

 

The reason I pointed out tires.

 

OK, I missed this the first time. I also used a Lares quick-ratio box in my 69 Cutlass wagon. At low speeds the car felt very twitchy. The problem is that I was over-correcting on small steering disturbances. After about two weeks of driving the car daily, I got used to the response and my brain learned to moderate steering inputs. That was a year ago and I love it. The more you drive the car, the less you will notice this, and eventually your subconscious will take over. Yet another reason to drive these cars as much as possible.

 

I will suggest that slow speed "in town" streets are not re-paved as frequently as freeways and major highways. As a result, the traveled portion develops a "gulley" where the majority of car and truck tires run.
.........Just my two cents worth.

 

That’s a very valid point!!