bent axle shaft vibration

I agree. They test drove and said its normal stating engine vibration and cam shaft vibration may cause this. Doing the measuring with the backing plate off it was obvious. Those 18" wide Mickeys must have added to that if the axles are not true. Driveshaft balance issues can generally be felt at vehicle speeds over 30mi./h . This field is for validation purposes and should be left unchanged. New engine, trans, drive shaft, axle housing, yoke, brake drums, ring and pinion, bearings, posi clutches and tires. Call us today at (413) 314-2280 or schedule an appointment online. Bent rim? Road force balance did nothing. I wonder if you could use a plumb Bob and some chalk on a level surface to lay down a diagram. Posted on June 16, 2020 by Nicole Palange in Auto Repair. You need a dial indicator to check the axle flange. the effect of bent shaft on the vibration spectrum. Was the bolt pattern redrilled in the axles when they were cut? (photo source: STOCK4B/Stock4B/Getty Images) Even the slightest bend can be the reason for serious shaking, especially when the car speeds up. Is there any other noise...like a grind or a serious hum...a visible vibration would indicate either axles or bearings...in this case, if the bearings aren't bad and if the axles aren't true, the bearings will break down. Would that vibrate at a specific speed? Multiply the ratio by the first order tire frequency. Your 4.11 gears make the drive shaft turn at high RPMs, more than a stock drive shaft is designed for. I will pull them and get to a machine shop. If the floor of your garage is clean enough to eat off of, you also have the option of rolling the axle shaft to watch for wobble. Call us today at (413) 314-2280 or. Bent Axle Symptoms. Did a makeover in 09. For more details on our efforts to combat COVID-19, check out our letter by visiting this post: https://rb.gy/qvxbgw. At V&F, our certified mechanics use latest diagnostic equipment, and high quality CARQUEST auto parts, to make sure we get the job done right. Sometimes it will not show. They are re-drilled 5x5 to 5x4.5 . We love "car p0rn", One of the worst cases of building for looks instead of using sound engineering was a "Pro Street". Maybe take a point front and rear of each tire, and at each end of each axle … Unstable Driving. You might notice fluid under your car after you’ve been parked for a while, or stains that slowly become more prominent in your driveway parking spot or on your garage floor. Symptoms of a Broken Shaft Axle Shaft Wobble and Vibration. If wheel wobble becomes more severe, the brakes can also start to malfunction as the brake pads slowly become misaligned with the wheels and begin to drag on the rotors. Can't hear any bearing noise. The lateral runout on the Weld prostars is still .030 left and .070 right. Since you've spared no expense getting everything. Please know we have extended our PICK-UP and DELIVERY service to all customers to help minimize the impact and provide peace of mind! They are phirelli scorpions and they are warm weather only tires. If your running 18" tires, your rims must have been 12 to 15 inches wide...anything with an 8" or 9" depth or off set can look cool but, if it's driven regularly...hard on the axles. Now I am down to pinion bearings and wheels being the only things that are not new in the entire drive train. Plus, our auto repair services are backed by an industry-leading 3 year / 36,000 mile warranty on parts and labor. You can get a pinion bearing kit from Randy's Ring & Pinion that has Timken bearings, pinion shims, 2 crush spacers, pinion nut and seal for less money that you can buy the parts individually. The surprising fact is even a minor fender-bender or a small bump in the road can lead to the twisting of the axle. This will become more pronounced as you increase speed. At V&F, our certified mechanics use latest diagnostic equipment, and high quality CARQUEST auto parts, to make sure we get the job done right. A bent shaft predominantly causes high 1X axial vibration. As the problem gets more serious, the wobbling tends to become more apparent, and more dangerous, so repairing the axle as soon as you notice is very important. I could not get a good reading on the axle outer edge or the face because of the rough edges and dings. Vibration at Certain Speeds . Imagine that you are Superman with X-ray vision, and by looking at the driver side of the car, you can see the engine and transmission, rear axle assembly and all of the suspension components. For a better experience, please enable JavaScript in your browser before proceeding. I have had a vibration from 55-70 since I ran this combo the first time in 92. The entire vehicle or parts of it--especially the floorboards--may shake and tremble, and the vibration will often intensify and worsen at increased speed. The axles are stock Ford that have been shortened. A Bent Axle A bent axle could cause serious shaking. Worst at 60 but smooth after 70. Your email address will not be published. In any event, if the axle is bent, that has to be addressed first, before considering other things. I have a narrowed 9" ford. Old bearing were okay too. Bent axle or damaged wheel: Often, the only sign of a bent axle is a wobble in one wheel. The next most common source of vibration is improper powertrain angle, driveshaft angle and axle pinion angle. Last week I took the bike for the second time to have them properly test it and they came back with an answer than my front axle and front fork is bent from a severe impact that BMW will not cover under warranty. A bent shaft can occur as a result of damage during shipment, rigging, or operation. When you’ve bent or broken an axle shaft, like the one shown above, one of the first signs you’ll notice is a slight wobble at lower speeds. When I bent an axle shaft you could see the tire wobbling in the mirror. Like a kid jumping on a trampoline, if they jump at the right rhythm they’ll really go high, but if they jump at the wrong rhythm they’ll quickly come to a stop. The reasoning was usually "Ah hes just going to putter around the fairgrounds revving his engine" Post pics of your rebuilt ride. I agree. I also could move the pinion about .010 up and down. What you are doing in the video is not reliable. Shaft straightening methods, when properly applied, can sometimes be used to salvage damaged shafting. The vibration caused by bent shaft looks like the vibrations caused by misalignment. Has a buzzing feel to it like a bad u-joint. If the actual axle shaft is bent then the tire would wobble. There are several possible reasons behind a bad CV axle. Required fields are marked *, ©2021 • All Rights Reserved | Privacy Policy. Most often a "couple" type axial motion will be the symptom. Same vibration at the same speed. Switching the o/d off doesn't seem to change it. I can see the wobble and the vib is the same. A faulty axle shaft can also cause the outer brake seal to leak which, in turn, can cause the brake drum to become coated in oil from the gears and dust from the brakes. » MORE: Get an estimate for your CV axle replacement. That was the mileage on the truck when he bought it. I changed housing to Trac9 because the narrowing job was done wrong and had no support in the end of tubes. send your axles in to Mosier and have them build you some new ones . As per Mobius institute [1], the shaft may bend due to excessive heat, due its length, or it may be physically bent. Where as a vehicle with a bent or broken axle will be unstable, noisy, leak, and cause vibration in the vehicle and steering wheel. As I rotated from stud to stud the others were gradually off to minus .028 at the opposing stud. IIRC the axles were cut and pinned to shorten but I see no parting line so I may have dreamed that part. All that is left is axles and pumpkin from the original set up. JavaScript is disabled. Now the only thing not new is the Prostars. Your 4.11 gears make the drive shaft turn at high RPMs, more than a stock drive shaft is designed for. Probably after another set of rear tires he might have started to wonder why they lasted only 10,000 miles. Drive axle problems. Sure seems odd that would be it but worth a shot. An axle can be bent due to, for example uneven heat distribution in the rotor caused by a defect rotor bar. What is the right way to measure axle run-out? New engine, trans, drive shaft, axle housing, yoke, brake drums, ring and pinion, bearings, posi clutches and tires. #2. The noise is a vibration starting at 50. I should have asked Mitler Bros. to check them when they built the Trac9 housing and pressed on the new bearings. Here are some of the possible causes of a bad CV axle. Drive Shaft And Drivetrain Vibrations: Understanding The Order And Math Of Vibrations ... obtain the rear axle ratio. I did notice the reflection in both wheels were wobbling. Be sure that you set the pinion bearing preload correctly. Shaft deflection, runout, vibration, and axial motion Chapter D4 Page 6 Contact Kalsi Engineering Search this handbook Figure 5 Groove wall wear due to dynamic runout This photo shows wear of the environment-side wall of a seal groove that occurred during extensive operation at 346 ft/min with 0.010” dynamic runout. I had a rim straightened that we thought may have been bent a little too far from tolerance. So, 3.08 x 11.5 Hz gives us 35.42 Hz. Try removing the axles, check the bearings and take the axles to a machine shop to see if they are straight....if you can see a variation when running just drums...I'd put my money on bent or untrue axles. A deep off set or something far away from center can be stressful on axles. Wouldn't be something I could trust. Read More: 5 Signs and Symptoms of A Leaking Axle Shaft. While you can inspect the driveshaft for signs of damage, only a qualified driveshaft shop can check for true straightness and balance. I have tried pinion angles from 3 up to three down in 1/2 degree increments to no avail. IMPORTANT: A component that is out of balance will NEVER cause a second or higher order vibration, only a first order vibration. Update: New strange axles in and vibration is still there.