Rear of overload springs touching pads while driving unloaded. - Ford Powerstroke Diesel Forum
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Old 04-19-2013, 07:12 AM
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Rear of overload springs touching pads while driving unloaded.

I've been having a rear shudder in this truck and when it's cold it doesn't shudder at all. But as soon as the truck warms up and gets some miles on it, then the shudder gets pretty bad. It only happens on take off and most of the time it's only while making a right turn. Although it can happen on a straight take off or making a left turn but it does it a lot more on right turns.

The other day I was under the truck and found that I've got about an 1/8" of slop in the rear drive shaft slip joint so I'll be greasing that up soon. And I'll be draining and refilling the rear diff with good gear oil and some friction modifier. Hopefully that will cure the problem.

Now, as I was looking around down there I noticed that the top rear of my overload springs were very clean/worn in one spot and that is just under the rubber contact pads. The front of the overload springs look rusty and like they've never touched the contact pad. There's a good many inches between the rubber pad and the top of the overload spring so it's not like they are always touching or within an inch of each other. There's definitely some good distance between them.

Soooooooo, in the worn/clean spot on the overload spring I put some white non-drying paint on it and took it for a long drive, unloaded of course. Lots of stop and go with lots of rear shudder, and nothing that would have made the suspension compress far enough to need the overload springs.

Sure enough when I got home and checked, the rear contact pads on both the driver and passenger side had white on them.

And so I was wondering if it's normal for the rear of the overload springs to contact the rubber pads under normal unloaded driving? Or do I have some really worn out springs and the shudder may be a combination of slip-joint slop and spring wrap?

Thanks!

Oh, and the suspension is completely stock except for some new Bilstein HD yellow/blue shocks and the Sulastic rubber shackles. I did the white paint test after I installed the Bilstein shocks and before installing the Sulastic rubber shackles.

Last edited by Soledad; 04-19-2013 at 07:20 AM.
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Old 04-19-2013, 10:38 AM
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I would check the Sulastic shackles to see if they are allowing the rear of the spring to move up higher than the stock shackles did.

Otherwise I would think that you are correct in thinking that your rear springs are worn out.
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Old 04-19-2013, 10:56 AM
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Thanks GregsSD. Actually I did this "paint" test before adding the Sulastic shackles so the rear springs must really be worn out. I'm trying to wrap my head around exactly how the axle is moving/rotating to allow the overload springs to touch the pads. Is the axle rotating upwards or downwards? Or could it be the springs are just compressing that far?

I've been wanting a GoPro so I might just take the dive and buy one and mount it to the truck to see exactly what the rear suspension and axle are doing.
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Old 04-19-2013, 11:04 AM
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A Gopro would definitely be your best bet for seeing what's going on!

When you accelerate, the pinion (front of the differential) tries to rotate upwards which would then be pushing down on the rear so this wouldn't the issue, but if you get enough shudder in the rear end maybe the axle housing is springing up and down quickly which could cause it to touch.

Just a thought!
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Old 04-19-2013, 02:07 PM
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the overload springs are just bent way up, iv seen this before
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Old 04-19-2013, 08:04 PM
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Ill take a look at mine tomorrow, but I think mine almost touch when parked. I think my springs are wore but to what extent I don't know. I do not think it takes much for the overloads to make contact. I am not sure how they sat when new either. Im pushing 200k and the previous owner hauled a trailer daily so im sure mine are somewhat wore
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