Don't know, I must have sat in wrong, lol..but it demonstrates that they do harden more over time, and can deteriorate.

I’ve used poly bushings in suspension work as well. No squeaks. As above lots of silicone grease on install. And in some cases, it is a much better application than softer oem style rubber bushings.

On suspension, I’ve noticed it is much harder with much less flex than oem rubber, such as leaf springs and shackles twisting and deforming as the oem style rubber bushing would, but will not with poly. (Which, means it will not absorb as much either.) I have pics of that as well. Night and day difference on flex.

I do like the S&B for body mounts. I like the softer silicone in that application. I also think they will stay more plyable in cold temps, than poly bushings, and will absorb better.

I also agree some of them do not have the surface area as mentioned above. The last ones I bought, energy suspension (body mounts) are narrower than oem or S&B.

Anyway, that’s my 2c and experience. Good luck with it either way OP. I wouldn’t sweat it too much, either way they will both hold your cab on.

Not to highjack this thread.. but I’ll post these for demonstration purposes the difference in hardness/flex between oem rubber and poly bushings. Big difference in my experience. Polyurethane is a much harder compound than oem rubber, or the S&B silicone. And will continue to harden over time.



Overview - this is a TTB setup, with heavier than stock springs, a lot of twisting force on these springs through the spring bushings. The actual shackle bushing inside the frame rail with oem rubber bushings (which I don’t have a pic of handy) deformed to the point of hard metal on metal contact between the frame and upper shackle sitting static. The poly did not deform at all. (That I have a pic of).

Over view. All parts are new and defect free.


OEM bushing. Hard over metal on metal. Bushing has completely deformed. Upper oem rubber shackle bush failed inside the frame rail. Shackle is hard over on the frame.


Poly, held the leaf in place with little deforming.



Upper shackle bushing. Unfortunately I don’t have a picture handy of the oem rubber. The Poly did not deform. OEM had deformed to the point of shackle and frame hard contact. The oem would not support it at all. It deformed to the point of failure. (If you look close in the two previous pictures, you can actually discern that deflection.)

 

Guess Energy Suspensions changed their design then. Here is an Energy Suspensions poly mount in a stock mount cup. When you tighten the mount, they bulge out a little over the cup sides like the stockers. This particular set was from 2019 or maybe 2020 (somewhere in there) and went on a 2008 F350



Here are the stocker's they replaced. Looking at the stocker, it appears to have about the same little gap between it and the mount material before tightening the bolt.



Gotta wonder why Ford didn't make all the body mounts out of the black rubber material. The two black rubber stock mounts were fine, only the orange ones had fallen apart.

 

Don’t know? The ones I bought were for a different truck, and they were definitely smaller in diameter as mentioned earlier in this thread. Those black rubber mounts look good!

I think we hijacked the OP’s thread and beat it to death enough.. Sorry about that OP.

Back to our regular scheduled programming. S&B vs Poly body mounts…

 

hey thanks for that fleet. i think i seen a blurb about that while i was doing my u tube research. Just bearing grease then? what brand of O.E. shocks does ford run ? or is there an equivalent that most buy. i will be selling her this coming spring i don't want to spend an arm and a leg, but i also don't want to put someone in a trash truck either. and then what like there's gas and what other options if you don't mind picking your brain thanks.

 

I don't think we ever really got off topic, we were discussing the pros and cons of poly mounts,,, which is relevant to the thread topic.

I've went with Energy suspensions poly body mounts for two trucks so far and have another set in my garage ready to go into a third truck when the Dorman mounts the previous owner put in give out. The Energy suspensions poly mounts fit and work fine, and I'll been able to replace the body mounts on three different trucks for the less than the cost of doing one truck with S&B.

While I'm sure the S&B mounts are good pieces as they generally make good stuff, but the price is just outrageous. Ferrari and Porsche make good cars too, but I can't see myself paying the asking price for one of those either when I can buy three Fords that do the same thing for the price of one Ferrari.
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