Vibration 60-70mph

[brad65ford]

Proved your belief to be incorrect. Studied this subject intensely over the past month to the point I even worked with the engineers at Ridetech with multiple shims and icon axle brackets to achieve perfect angles (including ideal 2 degree working angles on both sides) While there is normally at least 5 degrees of axle wrap on a standard 2wd 5.0 when taking off under full load with the new fiberglass left spring, we set ours to have 0-1 degrees just to test this theory out with out putting load/axle wrap conditions of course. Sadly its not the correction for the vibrations. Still has the unusually vibrations at 66-75 as well as other speeds shaking the seats.

If Ford doesn't know how to fix it, its serious.


Edit: Just wanted to add, I had the stock drive shaft rebalanced then purchased a driveshaft-1 replacement just since I didn't know for sure.

Sponsored

 

[WhiteLightningnshitshadow]

Proved your belief to be incorrect. Studied this subject intensely over the past month to the point I even worked with the engineers at Ridetech with multiple shims and icon axle brackets to achieve perfect angles (including ideal 2 degree working angles on both sides) While there is normally at least 5 degrees of axle wrap on a standard 2wd 5.0 when taking off under full load with the new fiberglass left spring, we set ours to have 0-1 degrees just to test this theory out with out putting load/axle wrap conditions of course. Sadly its not the correction for the vibrations. Still has the unusually vibrations at 66-75 as well as other speeds shaking the seats.

If Ford doesn't know how to fix it, its serious.

It's very interesting yours is happening at a slightly different speed. What rear gears do you have? I have the 3.55s in a 2.7 CCSB. It's a one piece aluminum driveshaft. It's a weird oscillation that seems to be oscillating at roughly 1 cycle per second (guestimate).

 

[brad65ford]

Same rear I believe that's in our as well, do you have the electric locking read as well?

Agree with you regarding sound / cycling sound. Would be crazy if its the trans some how but no mustangs with 10 speeds mention similar issues. Unless our torque convertors are different than the mustangs.

If I had all the money in the world I'd have an S550 irs fitted to the frame lol

 

[WhiteLightningnshitshadow]

Same rear I believe that's in our as well, do you have the electric locking read as well?

Agree with you regarding sound / cycling sound. Would be crazy if its the trans some how but no mustangs with 10 speeds mention similar issues. Unless our torque convertors are different than the mustangs.

If I had all the money in the world I'd have an S550 irs fitted to the frame lol

Yeah I have the fx4 pack which is the only reason I have the 3.55s and locking rear.

 

[brad65ford]

Same rear I believe that's in our, do you have the electric locking read as well?

So yours if 4x4, so our setup is a little different regarding drive shaft length etc..

Wondering if anyone has tried this on their Gen14's, doubts its the torque convertors doing this weird vibration

https://www.amazon.com/Lubegard-196...d9f2a94ee29f0&language=en_US&ref_=as_li_ss_tl

 

[brad65ford]

Today I took the truck for a short drive, the first 2-3 mins is the worst, which makes sense if its tire related since the tires would have flat spots from sitting for days etc.. Turned the rear view mirror down aimed at the rear cab / tires and noticed how bad the rear bed shakes which is what I'm feeling in the cab.

Next up is looking at the rear axle alignment to see if something is off. Fun fun.

 

[5.0Screw22]

Next up is looking at the rear axle alignment to see if something is off. Fun fun.

So, did you find the rear alignment to be correct? I have also been chasing some vibration issues and the fiberglass springs are one of my suspects. Like you, I have balanced tires, upgraded the driveshaft and played with driveline and pinion angles, but I have not been able to totally eliminate all vibrations. Have you looked at the Ridetech traction bar system? That may be my next test. I suspect these springs allow too much axle wrap that puts the driveline angle too far out, which results in vibrations under acceleration. If I am correct, a set of traction bars may eliminate the vibrations.

 

[brad65ford]

Turns out its the front end doesn't like the tire setup. As if its more sensitive to in perfectly or harder tires 20's with low profile tires vs 17 with big squishy tires. Always thought it was the rear end, not till I took the stock 17's OEM wheels and tires and put them on the rear only and still had vibration, swap the aftermarket 20's setup to the rear and put the stock wheels/tires in the front and it was smooth as glass. Not sure if the Ridetech shock setup in the front doesn't function as well as the stock shocks but I've played with all the settings including tire pressure and shock adjustment. Its crazy all this time I thought my issues where in the rear end. Needless to say I'm living with it since I really like the look of my 20's setup. Only option is to find better/smoother riding 20's tires.

Sorry didn't see your other questions, yes I now have their sway bar and torsion bar setup, love them both, rear is not and planted!

Please do me a favor, if you have aftermarket wheels like me and still have the stocker oem/wheels/tires. Try running just the fronts and see if that makes your cab stop shaking and report back!

 

[5.0Screw22]

Please do me a favor, if you have aftermarket wheels like me and still have the stocker oem/wheels/tires. Try running just the fronts and see if that makes your cab stop shaking and report back!

I would if I could, but my stock wheels 20" do not clear my front brakes. I am using 22" Niche wheels. More sidewall will help to cover vibrations, but that does not correct them. The tread design of some tires will transmit more road vibrations as well. Sometimes that is part of a performance tradeoff.

My front suspension is not the Ridetech stuff. In the front, I use the Belltech adjustable coilovers with the SPC adjustable upper control arms. I also installed the SPC camber kits in the lower arms, so I have full adjustability for alignments.

 

[TN_Ryan]

Ok guys…let’s bring this back up. Who else has solved their vibration issue? I have had a vibration above 65 MPH since I did the Ridetech 3/5 drop. I have tried every pinion angle combination to no avail. I’ve even strapped a GoPro under the truck to watch pinion angle during driving. It doesn’t appear to be pinion related…but I don’t know what else it could be. I have had the truck aligned, tires are the same before the drop kit.

Has anyone measured their pinion angle that doesn’t have the vibration?? I’d be interested to know what your pinion angle ended up being.

 

[5.0Screw22]

Be sure that whoever helps you has a similar truck. Your RCSB is very different from my crew cab. The driveline angles may be different, your driveshaft is different, etc., so the same solutions may not work. Also 4wd vs 2wd matters. I recommend addressing the vibrations at coast before addressing the vibrations under load. Sometimes they can be the same solution, but they can also be two different solutions for those two types of vibrations.

It took me a few tries to work out my vibration issues and get the angles set properly. I believe my final issue was caused by the composite leaf springs used in my truck. I had a vibration under load that I believe was caused by spring wrap. I added the Ridetech traction bars and that cured the last of my vibrations. FWIW, I also run the Ridetech air bags at 12psi.

My final numbers were trans 5.25 degrees down, driveshaft 1 degree down and differential 4.5 degrees down (pinion pointing up). Some people don't have a clear understanding of the difference between differential angles "up" and "down", so always confirm with pinion up or down. That's something that people can more easily understand. To clarify, I have a 4wd crew cab with a 1 piece driveshaft and composite rear springs. You can see my operating angles are slightly outside of what's recommended, but raising the trans would reduce my driveshaft clearance. With a 5" driveshaft, I need that extra space. Even with traction bars, I should be seeing about 1-2 degrees of spring wrap under load, but It feels so smooth now, that I don't want to mess with it.

 

[MGF150]

Ok guys…let’s bring this back up. Who else has solved their vibration issue? I have had a vibration above 65 MPH since I did the Ridetech 3/5 drop. I have tried every pinion angle combination to no avail. I’ve even strapped a GoPro under the truck to watch pinion angle during driving. It doesn’t appear to be pinion related…but I don’t know what else it could be. I have had the truck aligned, tires are the same before the drop kit.

Has anyone measured their pinion angle that doesn’t have the vibration?? I’d be interested to know what your pinion angle ended up being.
[/QUO

Ok guys…let’s bring this back up. Who else has solved their vibration issue? I have had a vibration above 65 MPH since I did the Ridetech 3/5 drop. I have tried every pinion angle combination to no avail. I’ve even strapped a GoPro under the truck to watch pinion angle during driving. It doesn’t appear to be pinion related…but I don’t know what else it could be. I have had the truck aligned, tires are the same before the drop kit.

Has anyone measured their pinion angle that doesn’t have the vibration?? I’d be interested to know what your pinion angle ended up being.

I have a 2024 RCSB with the the Ride Tech and the vibration. Mine has a small growl all the time and it gets worse under acceleration. It really shakes about 65 to 67 up to 75.
My kit is set at the recommended setting at this point. I don't know pinion angle yet because I can't get under the truck when it is on the ground.
This weekend I will put it on a drive on lift, measure my angle and start trying to chase the vibrations out.

 

[SpaceWhiteF150]

Mines at 74!!

 

[5.0Screw22]

I have a 2024 RCSB with the the Ride Tech and the vibration. Mine has a small growl all the time and it gets worse under acceleration. It really shakes about 65 to 67 up to 75.
My kit is set at the recommended setting at this point. I don't know pinion angle yet because I can't get under the truck when it is on the ground.
This weekend I will put it on a drive on lift, measure my angle and start trying to chase the vibrations out.

I purchased 4 large paver blocks from Lowes. They are 8" x 12" and 6" thick. I place them under the four wheels and it allows me to get under the truck while it is sitting on the loaded suspension. That makes it easier to check the angles without a lift.

 

[MGF150]

I purchased 4 large paver blocks from Lowes. They are 8" x 12" and 6" thick. I place them under the four wheels and it allows me to get under the truck while it is sitting on the loaded suspension. That makes it easier to check the angles without a lift.

Thanks for the info. I will by some for my house.
This weekend I am taking it to a finds house with a lift.

Sponsored