Does it matter which way rear shocks are installed? - Ford Powerstroke Diesel Forum
Suspension & Steering Discuss OEM & aftermarket suspension, lifts, air ride suspension, shocks, steering components, etc.

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post #1 of 11 Old 10-28-2012, 07:40 PM Thread Starter
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Does it matter which way rear shocks are installed?

Put new Bilstein 5100s for 2-4" lift on my 350 after my 3.5" level with an aal. I put the bodies on top because the boot would be right next to the 5" exhaust and didn't want it to distort or melt the boot. At 45-50mph the rear bounces and is getting kinda annoying. It's not the tires, have had them balanced three times and still the same thing. I heard that the body of the shock should be down and this should help with the bounce. Is this true? Wouldn't think it would matter.
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post #2 of 11 Old 10-29-2012, 08:05 AM
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Originally Posted by blk450er View Post
Put new Bilstein 5100s for 2-4" lift on my 350 after my 3.5" level with an aal. I put the bodies on top because the boot would be right next to the 5" exhaust and didn't want it to distort or melt the boot. At 45-50mph the rear bounces and is getting kinda annoying. It's not the tires, have had them balanced three times and still the same thing. I heard that the body of the shock should be down and this should help with the bounce. Is this true? Wouldn't think it would matter.
MOUNTING POSITION/DIRECTION CAN BE LIFE OR DEATH OF A SHOCK

You may have already trashed those shocks. Gravity keeps the fluid where it is suppose to be, running them upside down moves the fluid and eliminates cooling. The stiff ride is your shocks trying to hydro lock from excessive heat, keep it up and they will rip the weaker of your two mounts out of the truck completely.

Dust boots are good for collecting sand and other garbage that will score your shock rod. Replace your shocks and leave the boots in the box. I've had aftermarket shocks on my truck for years, no boots, no failure, and I live in a dusty/sandy area.

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post #3 of 11 Old 10-29-2012, 09:54 AM
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Shocks are fine..I would remount them with the Bilstein name right side up. Exhaust isn't hot back there ..unless you have a latter truck with regin...

Also the boots have holes to let any moisture that may get in ...out up side down the holes are in top.
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post #4 of 11 Old 10-30-2012, 09:07 AM Thread Starter
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Just talked to Bilstein and they said the 5100 doesn't matter which way it goes since its a monotube design. If it was a twin tube design then it would matter. I may flip them anyways to see what will happen.
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post #5 of 11 Old 10-30-2012, 06:02 PM
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I have the 5100s on the rear of my truck with the body mounted on top. That's the way its supposed to be according to the directions. They said mount them where the writing is in the correct direction. Hope it helps.



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
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post #6 of 11 Old 10-30-2012, 08:09 PM Thread Starter
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Then what else could I do to smooth out the rear end?
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post #7 of 11 Old 10-30-2012, 08:12 PM
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I didn't like Bilsteins I went a different route

I found them too stiff ,, but tire PSI can play into the ride also

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post #8 of 11 Old 10-30-2012, 08:21 PM Thread Starter
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The rears are around 55 psi and they are in 325/60/20s. I do t know how low to set them and for them to not be too low for bad tread wear. The are duratracs.
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post #9 of 11 Old 10-30-2012, 08:36 PM
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I recently started to have a bounce in my rear end at 49mph( yes exactly 49), im suspecting the toyo mt are culprit because that's the only thing that's change.

Anyways to answer your question. To soften the rear end get a mini-pack to replace the lower overload spring. Or you can get full replacement springs like deavers.

I would try a better shock though to begin with. That's the route im going soon. The 5100s are a bit stiff. But 55psi sounds ok. I run 60 in the rear of mine. I was running 50-53 but the outside was wearing to fast



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
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post #10 of 11 Old 10-31-2012, 09:23 AM
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the 5100s are an IFP (independent floating piston) design. This means there is a floating piston withing the shock body that separates the oil and the nitrogen. This prevents cavitation and negates any effect of gravity on the oil within the shock. What "Karls03" is referring to is an emulsion shock in which there is no separation between the oil and nitrogen/air and cavitation is prevalent given the piston isn't always submerged in oil. Overall, nothing you have to worry about.
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