Since I installed my 10.5" wide tires I notice the truck wants to follow ruts in the road much more than with the stock tires.  Has anyone else noticed this?  And is there a fix? (other than putting the skinny tires back on).

my 9.50's do the same thing.  I drive the same roads each day which have "ruts" in them, so i just choose different lanes to drive in to help control it a little better. 

My wife's car with street tires does it worse than mine does.  Hers has 15x7's with 205x60x15's on it.

I don't think there's anything you can do to prevent this.

It's been my observations that on stock vehicles it is from worn front end parts and rubber bushings. On modified vehicles ( those that have been lifted etc) you have introduced a new moment about which the unaccounted for movement is exaggerate. Simple said the larger tires are just picking up the road problems and forcing them up to your vehicles suspension. Replace you rubber bushings with poly and inspect and replace your front end parts. Don't forget the steering shaft rag joint, infact this is where I like to start and follow it all the way out to those big tires. Read the manual and it gives some good insight as to what is in tolerance and out as well. A bad combination is to "lift" your sammy with long spring shackles and have gushy spring eye bushings. My advice is hear is I came in on bad rubber I'm not about to go out on bad rubber if I can help it and long shackles don't get it done anyway. Hope this helps again just my observation you situ maybe different.

You might try altering the tyre pressures, slightly lower than stock sometimes helps.

Just one of thoes thing you have to put up with when you upgrage stuff.
What tire pressure are you running at?

Would the calmini steering stabilizer help this at all?

Would the calmini steering stabilizer help this at all?

It will help stop the steering wheel from being jerked out of your hands, but I'm sure the the zuk is going to track where it wants too, it's still up to you to correct where it goes

I just thought it might help dampen it a little and basically make it easier to deal with, I didn't think it would get rid of it completely of course.

31" tires need like 15-17PSI in the tires,
you go running 35 or 50 like the sidewall
says and it will ride like a rock, wear out
the center of the tires and chase cracks
in the road, BTW I run 12 PSI on the street
in my 33 Swampers

Wild

I run my 31's fairly low also. It wanders, Swamper always wander quite a bit. I noticed a HUGE improvement when I replaced my balljoints. Mine where SHOT.

All good info.  I will drop the pressure ASAP.

At least I am not alone! I have a 95 Tracker with OME lift and body lift. This things wonders all over the place! I bought it in PA and drove 9 hours back to Indiana. What a ride! The tires were inflated to 40 lbs psi. I dropped them down to 28 and it has improved but not gone yet. I see that some of you have had luck dropping them down into the teens. I will have to try this, and check the rest of the steering out a little closer. I will be watching as I am sure there will be plenty more great advice posted. Thanks Guys! (and gals)
 Ya know, I just had a brain fart! 4 years ago I bought my Diesel Ram 4x4. It had mudders on it. It too wondered all over, after runnning them into the ground I went with a Toyo all terrian tire, what a difference! And that truck weighs enough to squat the tires under full inflation. I maybe on to something here.  2200 lbs of tracker is like a basketball with all that air in there!

Have all the steering parts checked out. Mine drove fine with 29's but when I went to 33's, it only took about a month and the work parts started giving up. First, be sure to get the beefed up idler arm and install it ( a search for idler arm in this section will give you all the info you need on it) and have a front end shop check the rest of your steeting parts. Once I replaced mine, I can run any speed on the interstate with no tracking (unless sevier rutting in the travel lanes).

Zig

The tires were inflated to 40 lbs psi. I dropped them down to 28 and it has improved but not gone yet. I see that some of you have had luck dropping them down into the teens.

I have my 30x9.5's at 18psi right now, and I drive it on a highway everyday. It wanders a little, but it's a smother ride than with the 235/75's with 28psi.... and my fuel milage didn't go down that much, barely noticable. When I change to a 31/32 MT I'll probably be able to run them at 15psi. I live right next to a gas station, so I've changed it a fair bit to find what works best for me.

The other thing I noticed was the wider tires
increase the leverage on the springs, and makes
the tires sit like this  /  \   the  camber is all screwey
and the larger tires amplify the effect of the cracks
in the street. Also worn and espesially unevenly
worn tires tend to chase cracks more than even ones