[turtle1025]

Correct. Only the rear driveshaft. You can do the front yourself if you want. Unless you plan to "haul ass" in 4x4 the balance isn't that important. Don't know how much the doorman one costs, or if it comes with quality spicer U-joints. I'd stick with your original shaft vice a Doorman. Better steel and one of the more important parts of your truck. However, if all things are equal, and one is cheaper, go for it.

Sounds good thanks. I'll pull it off and send it to the shop after I install my new steering pump. They said it would take 4-5 days turnaround, so that kinda sucks I won't have a car for almost a week.

 

[BroncMom]

Killing this hum has become a quest... You'll practically be halfway rebuilt after you do all this...

 

[turtle1025]

Killing this hum has become a quest... You'll practically be halfway rebuilt after you do all this...

Yea this is kind of frustrating. I've spent a lot so far (time and money) might give it a break for awhile. After the driveshaft and pump I'm just gonna relax for a bit and take it to a shop.

 

[BroncMom]

Yea this is kind of frustrating. I've spent a lot so far (time and money) might give it a break for awhile. After the driveshaft and pump I'm just gonna relax for a bit and take it to a shop.

You're doing great... It can be frustrating, but also so rewarding. You have the talent and the resources to figure this out. Imagine how much more frustrating it would be spending the extra money on a mechanic and still have a problem. Patience young grasshopper... We've all been there... You got this 😊

 

[turtle1025]

Correct. Only the rear driveshaft. You can do the front yourself if you want. Unless you plan to "haul ass" in 4x4 the balance isn't that important. Don't know how much the doorman one costs, or if it comes with quality spicer U-joints. I'd stick with your original shaft vice a Doorman. Better steel and one of the more important parts of your truck. However, if all things are equal, and one is cheaper, go for it.

Taking my shaft to the driveline shop on Monday. Will let everyone know if it fixes the noise once I get it back on. In the meantime I'll be checking the radius arms again maybe re-torque them to spec and re-torque the pivot bushing as well.

Bald spot forming from scratching my head.

Thanks @Siggy89

 

[BroncMom]

Bald spot forming from scratching my head.

😂😂😂 Let's not go and do that...

 

[turtle1025]

Installed my driveshaft today, drives exactly the same as before. While I was down there, I checked the radius arm nut and it was actually super loose although the threads were the same length as the passenger side. Weird. Will be replacing the bushings on both tomorrow with new nuts.
Sound is still there and definitely from the front. Can "slightly" feel it in the steering and the floorboard now when making a slow and wide right turn.

 

[Gunfixr]

So, you could not feel it before?
Was the nut loose, as in free turning, or was the radius arm loose in the bracket, but the nut was tight?

 

[turtle1025]

So, you could not feel it before?
Was the nut loose, as in free turning, or was the radius arm loose in the bracket, but the nut was tight?

No I dont think I felt it before. The nut was free turning, no torque on it. I basically re-tightened the nut from 0-120ftlb, trying to match the # of threads on the passenger side. The arm itself seemed stiff and I could not move it by hand.

The bushings seem fine but I'm going to replace them just to rule it out.

 

[Gunfixr]

Not feeling it before suggests it's getting worse.
Although i'm not sure how a loose radius arm would cause a humming, it would be interesting if that cured it.

 

[El Kabong]

The thread linked below is the most thorough, & most frustrating, vibration hunt I've seen. He gets a software app to narrow it down. In post 151 @miesk5 talks about the app.

High Speed Vibration - At a Loss

I’m thinking tannerite might be the only solution to this. :) Have you checked to see if the frame is square yet? If the above is right and your rear axle is tweaked it might be the frame. To check the rear axle, I would get something solid and straight and put it behind the front tire. Pull a...

www.fullsizebronco.com

 

[turtle1025]

The thread linked below is the most thorough, & most frustrating, vibration hunt I've seen. He gets a software app to narrow it down. In post 151 @miesk5 talks about the app.

High Speed Vibration - At a Loss

I’m thinking tannerite might be the only solution to this. :) Have you checked to see if the frame is square yet? If the above is right and your rear axle is tweaked it might be the frame. To check the rear axle, I would get something solid and straight and put it behind the front tire. Pull a...

www.fullsizebronco.com

Wow I read through a lot of it. I basically replaced almost everything on @Want2BS8ed list except for the rear end, engine and rotor/hub. Again I'm 99% sure its somewhere in the front drivers side. Other than the noise/slight vibration on wider turns, the Broncs drives like new.

I guess what's next for me is :

• Radius arm bushings
• Wheel balancing
• Motor mounts
• New hub/rotor/studs (although i've already replaced all manual hubs/seals/bearings, so i'm not sure it's worthwile)

 

[turtle1025]

Balanced all four wheels, needed weights on all of them. No help. @Siggy89 , I didn't notice at first but now I think the new driveshaft helped with the pickup on acceleration. Going uphill feels way less of a chore. Not sure if this is just a placebo effect but I sure feel like it did something. It's weird.

Have an appointment at a mechanic to diagnose the humming noise next Wed. Hopefully figure out what it is.