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Spring wrap causing rear-steer?

thedrip

1/2 ton status
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Dec 13, 2003
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Chattanooga, TN
Tell me if this sounds right, or if I need to be looking somewhere else for the source of this problem. I know I have excessive axle wrap, I have ruined the current springs, but do have all the parts to make up an anti wrap bar sitting here, waiting on shop time. Now heres the problem, starting a couple days ago, my truck has developed a tendency to rear steer under throttle changes. Its only noticeable from 10-35mph or so. Slower and the truck drives so awful (42" TSLs) that I'd never notice it, and faster than 35 and it just doesn't seem to happen. Going from on-throttle (half throttle or so) to nothing, or nothing to half throttle, the back end of the truck wants to crab sideways out from underneath me. Makes the whole truck move about 12-18" to the side each time it happens.

Does that sound like the leafs are wrapping differently and causing the axle to get out of square, or should I be looking for something more like a broken center pin? u-bolts are tight as tight gets, all the spring bushings have 200 miles on them. Other than the springs being slightly deformed from all the axle wrap, nothing looks out of the ordinary when the truck is sitting still. No one is willing to drive the truck down the road while I hang off the side of the bed watching the leafs/axle for me to really get an idea of what it's doing while I drive.
 
If it's moving 12-18 inches i would check the spring center pic and ubolts first. I have had track bar bushings go bad on a semi truck and the axle moves front to back depending on acceleration or coasting. but it never moved almost a foot, just about 6 inches.
 
The springs are VERY soft. 4 leafs out of a normal 1 ton 56" pack. Whats getting me is the truck drove fine for almost 3 weeks, and this issue popped up suddenly. I'm wondering more and more if it is due to uneven tire inflation, as I had to add air to one of the rear tires a few days ago.
 
After I bent my old leaves I noticed the leaves rolled over more easily but I never really had the symptoms you are describing.
 
yeah,,I can't believe some suspension part would move around 10-12 inches and not be noticeable with a visual inspection of the springs and axles......
 

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