Bilstein 5100's on F-350 DRW CC LWB 4x4 - Ford Powerstroke Diesel Forum
6.0L Exterior Discussion Body and Accessories Talk

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post #1 of 7 Old 09-15-2019, 10:18 AM Thread Starter
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Bilstein 5100's on F-350 DRW CC LWB 4x4

Hey all.

I have an '07 F-350 w/6.0PS, CC LWB Dually King Ranch FX4.

Struggling a bit with uneven tire wear (cupping). New Ball Joints, TRE's, Hubs, etc (entire front end suspension wear items has all been replaced). I installed New Bilstein 5100's when I did all the work.

I'm still seeing some cupping after replacing the 5100's under warranty. Tire shop said they were shot even though they only had maybe 7k on them. Tires were replaced a couple of months ago and the new tires are wearing in a similar fashion.

I'm wondering if maybe they're too soft.. anyone experienced this with the 5100's?

Tires are the new design Cooper Discoverer AT3 LT's, Load Range E running spec @75psi (front)

Should I go back to the Rancho shocks? OE ones were shot so I'd have to go with the RS5000.

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Last edited by 007matman; 09-15-2019 at 10:28 AM.
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post #2 of 7 Old 09-15-2019, 11:11 AM
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if anything the 5100 are stiffer than a Rancho 5000 but the shocks should not play into this cupping issues


are you running 75 psi even unloaded or do you haul often ?


i may try the chalk test to see if your running a good psi
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post #3 of 7 Old 09-15-2019, 11:12 AM
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5100's shot in 7000 miles is basically unheard-of under normal circumstances and proper application

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post #4 of 7 Old 09-16-2019, 10:25 AM Thread Starter
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I do run 75psi even when not loaded. The max the truck ever sees is my 7500lb travel trailer. I do use a WDH so, it does see a bit more than normal when towing.

Think I could drop it a bit? Think that would help?

I've been having trouble maintaining 75psi due to bad valve stems and/or seals. I think I have that fixed now (been maintaining 75psi for a week now).

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post #5 of 7 Old 09-16-2019, 12:38 PM
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F350 DRW towing 7500lbs. I would be less than 75psi for sure. Honestly bet way is chalk test and drive around. Air pressure is very subjective to the tire, truck, load, and more. For example. I have a f250 with 285/75r16 bfg at2s rated for 3750lb at 80 psi. I run about 50-55 empty otherwise very rough ride and barley few inches of contact on pavement from tires. I have only had them aired to 70ish psi even when towing a 35ft 5th wheel hair over 12k empty and the tires did not buldge, no sidewall roll on sharp corners etc.

I would air them down to say 65psi and drive around for a bit. OR if you have a nice fancy shop floor do the chalk test. I hate testing on gravel/asphalt but I probably just got the wrong chalk or something in the past.

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post #6 of 7 Old 09-16-2019, 03:04 PM Thread Starter
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I tried the chalk test.. looks pretty consistent @75 psi


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post #7 of 7 Old 09-17-2019, 11:38 AM Thread Starter
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Bump..

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