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Still vibrating from 55up. Everything I can think of has been changed. Someone mentioned the yokes coming out of the transfer case or rearend causing the problem. Thanks for any ideas.
 

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95 5.8L MAF XLT, Hedman Shorties/MF SS Y & Muff, E4OD, Man hubs, KYB Quads, 31x10.5x15, 304K miles
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Go to the below Thread to get ideas what could be going on in your case.

 

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the only thing i havent tried is an anti sway bar. im in the same boat. been through EVERYTHING and just changes the speed at which the vibe comes on. my next assumption is that the pinion angle changes under load down the highway enough to cause the vibe........so maybe some traction bars/anti swaybar will keep the pinion angle from changing or changing as much?

literally, everything else has been changed or checked, shop after shop, taken apart in my driveway over and over and over, tripple checking stuff.........to no end, still does it. ive been able to move it up to about 60-63mph luckily but its makes hwy travel $#!ty......cuz todays cars are flyin......and ive got the power to keep up but my vibes keep me down.......
 

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Still vibrating from 55up. Everything I can think of has been changed. Someone mentioned the yokes coming out of the transfer case or rearend causing the problem. Thanks for any ideas.
So is there another thread on this? One that has everything suggested already?
 

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he put a link if you want to read through it, there are several people on here with this issue.
He as the OP? I don't see a link from him.

His first statement leads me to believe he's already posted on this subject once, but started a second thread. That's what I'm asking.
 

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He as the OP? I don't see a link from him.

His first statement leads me to believe he's already posted on this subject once, but started a second thread. That's what I'm asking.
Yo Scott,
Stevo440 was referring to a long Vibration thread by member Want2BS8ed @ High Speed Vibration - At a Loss
 

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Yo jsb767,
See
Section 00-04: Noise, Vibration and Harshness
1996 F-150, F-250, F-350, Bronco and F-Super Duty Workshop Manual​
DIAGNOSIS AND TESTING
Symptom Charts
ROAD TEST DIAGNOSIS
ConditionPossible SourceAction
  • Noise Is the Same on Drive or Coast
  • Road noise.
  • Vehicle OK.
  • Tire noise.
  • Front wheel bearing noise.
  • INSPECT/REPLACE front wheel bearings. REFER to appropriate section in Group 04 (2-wheel drive) or Group 05 (4-wheel drive).
  • Differential bearings.
  • INSPECT differential bearings. REFER to appropriate section in Group 05.
  • Pinion bearings.
  • INSPECT pinion bearings. REFER to appropriate section in Group 05.
  • Noise Changes with Type of Road Surface
  • Road noise.
  • Vehicle OK.
  • Tire noise.
  • Noise Tone Lowers As Vehicle Speed Lowers
  • Tire noise.
  • Driveline noise.
  • INSPECT driveshaft, U-joints and rear axle universal joint flange. REFER to Section 05-00. For removal of driveshaft, REFER to Section 05-01.
  • Similar Noise Is Produced with Vehicle Standing or Driving
  • Accessory noise.
  • Transmission noise.
  • INSPECT transmission and mount. REFER to appropriate section in Group 07.
  • Engine noise.
  • Noise Most Pronounced on Turns
  • Front or rear wheel bearings.
  • INSPECT front/rear wheel bearings. REFER to appropriate section in Group 04 (2-wheel drive) or Group 05 (4-wheel drive) for front and rear wheel bearings.
  • Differential side gears and pinion gears.
  • INSPECT/REPLACE faulty gears or clutch packs (if equipped with limited slip). REFER to appropriate section in Group 05.
  • Drive Noise, Coast Noise
  • Wheel bearings.
  • INSPECT front/rear wheel bearings. REFER to appropriate section in Group 04 for front wheel bearings on 4x2 vehicles or Group 05 for front and rear wheel bearings on 4x4 vehicles.
  • Ring and pinion gear.
  • PERFORM Pinpoint Test G. INSPECT ring and pinion gear. REFER to appropriate section in Group 05.
  • Clunk on Acceleration or Deceleration
  • Inoperative throttle damper.
  • REFER to appropriate section in Group 03.
  • Loose suspension components.
  • INSPECT suspension. REFER to appropriate section in Group 04.
  • Worn and/or loose driveshaft U-joints/rear axle universal joint flange.
  • Worn driveshaft slip-yoke splines or sticking slip-yoke.
  • Loose engine mounts.
  • Excessive ring and pinion gear backlash.
  • Transmission (backlash).
  • REFER to appropriate section in Group 07.
  • Noise Is Different When Transmission in Drive During Coasting and When in Neutral During Coasting
  • Axle.
  • Transmission.
  • INSPECT transmission. REFER to appropriate section in Group 07.
  • Gear Howl and Whine
  • Ring gear runout.
  • Insufficient bearing preload.
  • Ring and pinion gear backlash.
  • Worn ring and pinion gears.
  • Chuckle Noise
  • Broken gear teeth.
  • Ring and pinion gear clearance.
  • Knock Noise
  • Axle shaft end play.
  • INSPECT and repair axle shafts. REFER to appropriate section in Group 05.
AXLE DIAGNOSIS REAR
ConditionPossible SourceAction
  • Vibration and Boom
  • Ring gear and pinion.
  • Rear Axle Noise
  • Differential carrier.
  • Axle shafts.
  • Lubricant.
  • Loud "Clunk" in the Driveshaft When Shifting from Reverse to Forward
  • Driveshaft.
  • Rear axle shaft or carrier.
  • On Turns, the Rear Axle Has a Chattering Noise (Limited Slip or Traction-Lok® Axles Only). Slight Chatter or Groaning Noise on Slow Turns After Extended Highway Driving Is Considered Acceptable and Has No Detrimental Effect on the Limited Slip Axle Functions.
  • Lubricant.
  • Differential.
ACCESSORY DRIVE DIAGNOSIS
ConditionPossible SourceAction
  • Excessive Noise
  • Seized accessory.
  • Belt Squeal
  • Loose belt.
  • Noisy Accessory
  • Worn accessory bearings.
  • Loose bolts/brackets.
  • Rattle
  • Loose pulley, accessory or bracket.
  • Noisy Tensioner Pulley Bearing
  • Worn bearing.
  • Belt Chirp
  • Misaligned power steering pulley.
  • Severe Belt Flutter
  • Loose belt.
  • Binding tensioner arm.
NOISE, VIBRATION AND HARSHNESS DIAGNOSIS
ConditionPossible SourceAction
  • Shake/Vibration in Drive Under Acceleration/Deceleration
  • Tires/wheels.
  • Loose or misadjusted wheel bearings.
  • Brake rotors/drums — brake imbalance.
  • Suspension/steering linkage.
  • Engine/transmission.
  • Tip-In Moan
  • Air cleaner.
  • Engine mounts.
  • Exhaust.
  • Idle Boom/Shake/Vibration
  • Engine control cables or hoses.
  • Engine mounts.
  • Exhaust.
  • Drive belts and pulleys.
  • Engine Accessory Vibration
  • Drive belts and pulleys.
  • Mounting hardware.
  • Accessories.
  • Driveshaft Vibration
  • Driveshaft — runout indexing (axle/transmission), rear axle universal joint flange, and balance.
  • Tire/Wheel Runout
  • Imbalanced tires.
  • Damaged tire/wheel.
  • Brakes — Vibration/Shudder
  • Brake shoes/pads.
  • Brake rotors/drums.
  • Brake calipers/wheel cylinders.
  • Axle Gear Noise
  • Improper or low axle fluid lubricant.
  • Axle shaft splines.
  • Differential gears.
  • Broken ring gear bolts.
  • Broken teeth on gears.
  • Incorrect clearance between axle gears (ring and pinion).
  • Worn pinion gear/bearings.
  • Noise or Vibration — 4-WD Vehicles
  • Wheels/tires.
  • Wheel bearings.
  • Driveshafts/U-joints.
  • Hubs, automatic or manual locking.
  • Engine/transmission mounts.
  • Transfer case.
  • Engine/transmission.
  • Driveshaft Joint Noise and Vibration
  • Worn U-joints.
  • Center bearing support (driveshaft).
  • Worn slip-yoke.
  • Worn or damaged driveshaft.
  • Non-Axle Noise
  • Grille whistle.
  • Trim moulding.
  • Roof top luggage rack (if equipped).
  • Drive belt squeal or chirp.
  • Tires.
  • A/C system.
  • Exhaust.
  • Aftermarket add-ons (running boards, grounding body to frame, antennas, visors, bug deflectors, etc.).
  • Axle Noise
  • Bent or damaged axle housing.
  • Axle shafts.
  • Bearings.
  • Wheel End Vibration Analysis
  • Tires/wheels.
  • Worn or damaged wheel bearing.
  • Brake drum/rotor imbalance.
  • Engine or transmission mounts.
  • Engine Run-Up Check
  • A/C system.
  • Exhaust.
  • Transmission.
  • Engine.
  • Drive Belt Check
  • Drive Belt and/or pulleys.
 
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