I done blame you, mine make a knocking sound at low speeds. I’d go back to factory before I’d recommend Energy…

 

I may as well follow up too. I have nothing to report since I had sold the truck with the kit.

 

Mine are creaking and popping a little bit, mostly creaking. But the bouncing in the rear of the cab is out of control.

 

Did you ever find a fix to your creaking and popping noises? I just installed Energy Suspension cab bushings on my 05' F250. The rear mounts are rattling/creaking like crazy....drives me nuts! Wondering if you found a way to tighten things up?

 

Sorry, I'm just getting to this, I didn't know someone asked a question. Earlier on I took the lower parts out and lubed them. That stopped some of the creaking but the passenger side 2 and/or 3 mounts would NOT stop creaking.

I did buy the S&B Filters kit which is a really nice kit with new Ford bolts included. A buddy of mine helped me install them about 3 weeks ago and they don't creak, pop or anything. The cab feels more solid than before. I notice a little bouncing but not like with the Energy Suspension mounts. I hope that doesn't get worse.

 

I've had the S&B mounts on for five months and love them.

 

Nice, I hope mine are in there for the long run. I also wonder if there would be a difference in how the cab would behave being a SuperCab on yours versus my Crew Cab. I had a little bouncing this morning on the way to work and it almost seems like they're starting to bounce a little more.

What torque did you use on yours? The directions said 60 for mine.

 

Your cab is heavier but you also have two more mounts, so I would suspect not much difference in behavior. I torqued mine to 60 ft-lbs.

That said, I have had a bouncing going on since about the time I did the bushings, but I also replaced tires and front leaf springs with x-codes which are stiffer on the super cab than I bargained for. I notice it on certain sections of road that I drive everyday, sections with ripples and cracks and dashed skid marks. It only happens in speed range of 45-55, and only when cruising at a mostly constant speed. Take my foot off the gas or accelerate and it goes away. When it happens it feels like a cylinder is missing or the tranny is slipping, but the rpms don't change. I was hoping rebuilding the rear end would fix it, but no dice.

I really don't think its the cab mounts. I'm leaning towards the x-codes and tranny shift points as the source, or maybe even a plugged up muffler. Cruising at that speed range feels like the engine has no guts, like driving when the engine is cold, or like it should be in a lower gear.

 

Wow, that description is pretty much exactly what is going on with mine except I have the stock suspension; same speeds, same cruising condition and the same things to make it go away. I actually had my U joints, swing bearing changed out hoping that was it, but that was a couple of years ago. The guy even recommended a front yoke for the rear shaft as he said it was worn. I thought great no more bouncing but it didn't solve the problem.

 

Did the bouncing start right after you installed the cab mounts, or did you change them in an attempt to solve the problem?

If you haven't been keeping up with my rebuild thread, I have replaced the entire front end (ball joints, springs, shocks, hubs, bushings, end links, steering stabilizer), had the driveshaft professionally rebuilt, replaced the rear end with one that I rebuilt with a trutrac, rear shocks, and of course cab mounts. And I still have that damn bouncing sensation.

Discount Tire replaced replaced two tires, rebalanced multiple times, and finally replaced the whole set with another brand. It did help but it's still there. And I just noticed last week during the rear end swap, that the right tire has 4oz of lead all lined-up right next to each other on the inside of the rim. So maybe its still the tires, but I can't ask them to replace anymore of them.

I do feel the bouncing in my seat, which suggests the source is the rear of the truck. My truck doesn't have a rear sway bar, so if it is just a poorly balanced tire, it makes sense that the addition of a sway bar might help, if it doesn't cause the other wheel to start bouncing too. That would be the next cheapest fix attempt for me. Probably pick one up at a junk yard for $50. And I haven't replaced the rear leaf springs so there's that.

The other thing I'm actively looking into is exhaust upgrades. This truck has always had a whistle at idle. It's so loud I can hear it in my house when the truck is in the driveway running. I also noticed last week that the muffler is spitting soot on the right shock through a weep hole. So now I'm thinking the muffler is plugged-up, and maybe adding to the bouncing sensation under minimal load, but then it seems that would affect engine RPMs and also affect EBP readings.

I guess we'll see how it goes as I throw more parts at it.

 

Well, the first attempt in replacing the bushings was just because the factory ones were shot. I think I remember a little popping from one or two of them but I don't remember which ones.

I had the motor upgraded with ARP studs, the upgraded turbo drain, STC fitting etc. so the shop cabbed it and I thought that would be a great time to go ahead and replace the mounts. I also had a pinion seal replaced and the upgraded Ford differential cover installed. This place was about 4 hours from me and rode fine pretty much on the way back. But within a week, I noticed the truck bouncing or what I thought was the truck bouncing. I called that shop because I thought they messed something up with the rear end. I never even thought about the mounts. I started checking the driveshaft because the bouncing was toward the center of the truck. I removed it and had it rebuilt like I said in the previous post. It needed servicing anyway and that yoke replacing. It's that weird feeling where you don't want something to be wrong but you're glad you found something that could cause the problem.

After that, the bouncing had pretty much gone away or so I thought. I called the shop and told them it was the driveshaft and they were relieved but were also willing to help me out in any way. But after about a month or so the bouncing started again, on the certain stretch of road, at a certain MPH range, at a certain RPM range just like you described. I didn't know it was JUST THE CAB until I looked behind me during the bounce and I could see the cab bouncing but the bed wasn't moving.

I've toyed with the idea of having some delrin mounts made for the rear. My brother is a machinist and he could cut some up pretty quick I'm sure. I just don't know the height. I'm sick of this bouncing.

 

The delrin bushing idea would be good to rule out cab mounts, but I wouldn't want zero flexibility between the frame and cab. The Energy Suspension mounts I put on my last 6.0 (03 F250 short bed crew) were stiffer than stock and I wouldn't want to go any stiffer than that. If I was doing that as a test, I would use polypropylene rod that's half the cost of delrin. I would get my lengths by measuring between the cab and frame as it sits with the S&B's installed.

One thing I've been thinking about but forgot to mention is motor mounts as a possible source. I haven't done any research and have no experience diagnosing or replacing them, but it might be something to look into.

When the ice thaws and I can get back on the road, I'll have to look for the bouncing. If I see it as plainly as you describe, I'll be calling S&B and maybe see what their lifetime warranty is worth.

Have you observed any correlation between outside temps and degree of bounciness?

 

Delrin is just the first thing I thought of but you're right, I'm sure there's better stuff out there to substitute. I haven't thought about the motor mounts. Mine are original. The S&B mounts are definitely better than the Energy Suspension mounts. I'm not entirely sure they'll get worse, but the Energy Suspension mounts did and that's what I'm going off of. Although the S&B mounts are "silicone" instead of polyurethane. They don't bounce much but more than I would like. I would like NO bouncing actually.

I haven't noticed any correlation between temps and bouncing, but I wasn't looking for it either. I'll try to pay attention to that and see if I notice anything.

 

Just as I suspected, more bouncing on the way to work this morning. The solid ride didn't last long. Now I'm thinking about what other ways I can stop it. I saw another poster write about modifying the bottom bushing, maybe stiffening it up with extra spacers or something. That would be an easier, least invasive option I might try.

 

I drove through town yesterday at 35-40 and didn't see any cab movement independent of the bed. Would it be possible to post or email a video of what you're looking at?