put TerrFirma 2" lift with medium duty springs and shocks.

New tires, alignment done, Terrafirma heavy duty tie rods.

Checked ball joints, air pressure and everything else I can think of.

Truck still seems to have a wonder effect to it.

A shop is telling me that I need caster correcting radius arms to fix the problem.

One of the reasons I only went with a 2" lift was to keep from having to mess with crap like caster, shaft alignment and other stuff.

Do y'all think the shop could be right on this?

 

What kind of tires and size? They may contribute to the "wondering", at least from my desk...

 

You had a alignment? Well, what were the results? What are your current castor angles? Are they in spec or out of spec?

To answer the question, yes, technically speaking. Raising the suspension will have an adverse effect on steering geometry.
Even the most incremental lift over stock height begins to change steering geometry. the higher you go the more out of spec you climb.

I highly recommend installing an adjustable panhard bar. I did after installing a two inch TF MD lift and worked wonders for me. I ultimately installed 3* castor correcting arms since I knew I was going higher in the future.

Do me a favor check to make sure your panhard bar bolts are tight. Also, verify the panhard bushings are in good shape, no splits or cracks. A loose panhard bar would definitely cause the truck to "wonder" down the road.

 

Any lift of any amount will affect caster. Is just the nature of how the front axle is setup. I had about 3 inches of lift and it never bothered me on my 2003. Steering was a little lighter, but not unbearable.

 

It will absolutely affect castor, but it should not be too big of a deal. Most people just run without cranked arms.

 

wandering from a 2" lift sounds a bit more indicative of other issue, rather than caster alone. yes castor is effected, but i'd start with tires. correct inflation (chalk test is my preferred method of finding correct psi), you getting any out of balance indications? alignment on?
how are the bushings in the arms? as mentioned ....panhard, how are those bushings?

 

You said "new tires". Are they large/tall tread? You can get a bit of road wonder with a new tall tread tire, because they flex some.

 

Brand new BF K02 All Terrains 265/75 r16.

I'll check the pan hard bushings again, but last I checked, I could not move it when I shook it last time.

 

As a side not, Could someone explain to me how the panhard rod in the back affects the steering the way I am describing.

 

There is no panhard bar in the back... it's in the front. In the back is a watts linkage.