Does it have the castor bushings? the fox shocks are for 2" lift right?

GMC was IFS, i miss IFS until i realize how i never have to work on IFS anymore

 

Thanks for the reply.

The shocks are for leveled trucks. I am taking it in today to have the alignment and all front end parts checked and hopefully fixed. I bought 2 degree bushings a few weeks ago and have them in a box if the event that it will help. I can't tell you how much I hate the way it currently drives down the road but, everything else about the truck is good.

 

Unfortunately, there are 3 types of things (at least) that get slang called "bump steer".

1.) We have bump steer where the truck moves, changes direction when it hits a bump. Real actual bump steer. What happens if you hit those bumps, but you're holding onto the wheel firmly? Does the truck go straight through nicely? I'm betting it does. Sometimes an oversprung, underdamped Ford can dance around as the rear end bounces. Add weight, reduce spring, or add damping.

2.) Suspension geometry bumpsteer. A very handy tuning aide that's extremely beneficial to IFS sports cars. i don't think this applies to our trucks at all. Lowered Mustang people try eliminating it, then complain about snap oversteer, lack of steering. LOL. Newbs.

3.) Bump steer felt in the steering wheel. This is the normal one for big trucks. Truck drives fine, steering wheel reacts to bumps. When the suspension cycles, the entire front axle moves left to right. A lot. Not just a hair. You can feel this in the steering. Because if the axle moves, and the earth doesn't, is there not a torque applied to the steering system? It can't be fixed. It can be mitigated by softer tires, firmer dampers, and making sure all joints are tight. Especially the trac bar and pitman arm.

This is about the only advantage of IFS on HD trucks. But they definitely have bumpsteer of their own, just not "felt bumpsteer" over bumps that hit both sides evenly. Hit a bump on one side only, yeah you're going to feel it even more than a live axle.

 

I have a platinum that's exactly like the one described above minus the adaptive steering and I have done all of the above to it including the caster bushings, fox shocks (for a 2" level), track bar bracket, & dual steering stabilizer. Nothing's works! The steering shake is just as bad as the first day i put the 2" leveling kit on the truck. I just got done talking to a guy at Ford and he said to try putting 80 psi in the tires 😐. I'm going to try it but I'm pretty sure it's not going to do the trick and my truck will ride like crap. I'm at a loss of what else to do at this point. It's really getting annoying .

 

It's also worth mentioning, that just a wee little motorcycle has a shock worth more than $500. The shocks these trucks deserve, are going to cost.

I'd have to drive the truck to see if it was something out of spec or normal. Could still be an alignment issue. But there should always be some felt force in the steering.

 

It sucks doesn't it..lol

 

I can understand some force but not as much as I'm seeing. It's uncomfortable to drive on even a slightly bumpy road. I keep telling myself that I'm just going to live with it but I find myself constantly looking for a solution other than taking the truck completely back to stock .

 

Kinda. It shouldn't be too bad, but it'll be there.

It's mostly in our heads. Just like the firm ride when we're sitting on a foot thick foam seat. If we were in India and riding on a seat of nails, ok, I get that. But riding a couch?

 

I am not new to vehicles or characteristics and this my good sir, is not normal. That said, It is going in to have the front end checked for worn or loose parts and also see about getting extra caster to help fix the issue. I will report back.

 

If it's more than the normal amount, I'd chase after all the normal death wobble culprits.

We've had a few pitman arms made of chinese cheese lately that needed replaced. And loosen and torque the ever living heck out of the trac bar bolts.

 

I believe that the main contributor to bump steer is the angle of both the drag link and track bar. They need to be very close to the same angle. Making them the same fixed it on my truck. Most adjustable track bars will have a bend at the bottom to account for the needed increase in angle when lifted. Drop bracket will accomplish the same thing. Without the ability to adjust center on the axle. This becomes more evident the higher you lift but can still be an issue at 2 inches.

 

I am running a 17' with 35"s on a 2.5" level kit. I had bump steer as well. 2 weeks ago I bolted on a dual stabilizer setup and it made a drastic improvement with bump steer. I drive a lot of rough paved roads and in the turns my steering wheel would jitter and almost felt like the *** end was going to kick out, the new stabilizer made a huge difference in what i feel in my steering wheel now. Simple bolt on mod I am glad I did.

 

I had bump steer in a completely stock truck, it was expected as I've had solid front axle trucks before, but for some reason it was more unnerving in the '17.

The day I put my 2.5's on it completely went away. There is a down hill turn on my way to work that has an uneven manhole. I could replicate the bumpsteer, wheel shaking back and forth and the rear wheels hoping around, every, damn, time.

Put these on and it seriously went to absolutely nothing. Barely registers a shake in the steering wheel now. I know you guys arent going to want to spend $2k to alleviate this. But maybe its just the valving is too soft on the stock shocks. You could also try getting 2.5" Carli coils, they are only $315. Might firm the ride and control the front end better?

Bump steer sucks because it can be so many different things, and they arent all actually bump steer. Hard to diagnose things like that over the interwebs.

 

Hopefully they figure it out for me today. For what it's worth, I did install the fox mono's on the front and still have the same issue. If the shop can't figure it out completely, I will ordering a stabilizer and if that doesn't make it tolerable, I will probably admit defeat and get something else. :/

 

Bummer man. Keep us updated. Its got to be something in the track bar or...