Excursion Steering after Axle Swap

TrailLite

Member
A reputable local shop performed axle swap. Good condition ‘08 axles into my ‘03 EX (7.3L) with full Carly/Fox kit from Top Tier. Happy with suspension manners. But the steering is a nightmare.

I struggle a bit to verbalize what’s going on. The best way I can describe it is it requires abnormal force to steer and it’s hard to keep it straight. When in motion, particularly at higher speeds, too much force is required for the small corrective movements normal to driving straight. And rather than rig straighten out once you release from a steering action, driver must actively steer back to neutral wheel position. The result is dangerous feeling when piloting the EX. Additionally it is mentally, and a bit physically, exhausting. Which is unfortunate given the rig was built as a dedicated family hauler for our frequent trips from Texas to Colorado.

Two different shops have used computer systems to check alignment, caster, etc. everything is set.

When researching this project I didn’t hear anything about steering compromise. Is this just what I get for doing swap? How can I get back to smooth steering?
 

vintageracer

To Infinity and Beyond!
Could be a lot of things.

Steering box worn or someone has messed with the worm adjustment and cranked the worm to far down on the sector.
Steering box itself not tight on the frame and moving around.
Cracked frame at steering box mounting location.
Broken or cracked mounts for the front centering axle panhard type bar if so equipped.
Power steering pump pressure too high/low.
Pitman arm drop and therefore angle to drag link wrong.
Drag link angle wrong.
Ungreased ball joints ,tie rod ends, improper sway bar linkage.
You say alignment is right. What specs do you call "right"?
Steering stabilizer if equipped might be wrong for application.

There are lots of things that could be wrong and cause the situation you describe.

Detailed multiple pics of front end setup would help immensely!
 

glock7018

Member
Its sounds like memory steer. Did you replace the ball joints? I would jack up the truck, take the wheels off. Undo one end of the tie rod so each knuckle moves independently. There should be very little resistance with moving each knuckle by hand. If its stiff then the ball joints are binding and causing what is called memory steer. This is usually caused by improper torque specs and procedure when installing ball joints.

Also I would like to see what the caster specs are on the alignment read out as well.
 

Superduty

Adventurer
Did you use the original 03 steering gear or did they swap in an 08 steering gear?

The front axle you swapped in used a different steering gear due to the different dimensions of the front axle, tighter turning radius and different geometry.

As mentioned above it could be ball joints.

Another issue that many times eludes mechanics is a problem with the axle u joints. Check out this video - Steering Issues


FWIW - since about 50k I have had some similar type steering issues on my 99.5 Super Duty. I have replaced the steering gear twice with Redhead units, 2 Ford dealers looked at it and nobody could figure out the issue. I live with it, though I don't like it.

I am thinking about doing the axle swap you did, just not totally sure if I want to invest that money into this truck.

If you figure out the problem, please post back up over here.
 

Betarocker

Adventurer
I've had clapped out u-joints in the axle cause some weird handling. Also consider, the frames for the coil spring superdutys were beefed up for the coil spring mounting. There have been incidents of the frame cracking when converting to the 05+ axles without addressing the frame.
 

TrailLite

Member
Hey Expo friends... just thought I would follow up on this thread in case it helps anyone. Tribe 16 in Ft Worth, TX installed a full PSC Steering kit and it fixed it all. Be well! - Nathan
 

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