Ford - F150 :: Occasional Vibration When In Gear - Scraping / Squeaking Sound
Oct 12, 2013
Vehicle: 1998 F150, 158k mi. MT (M5OD), 4.9l I-6.
Description of problem: About 2 weeks/500 miles ago, truck developed a scraping/squeaking sound. I thought maybe something was rubbing on the driveshaft, but inspection revealed no likely candidate, nor disturbed metal on the shaft.
Over the course of the next 500 miles, it's gotten worse, so that current symptoms exhibit themselves (to one degree or another) 80% of the time. The symptoms are:
- Worst on first drive of day, on first mile.
- Sound produced somewhere between scrape and squeak.
- Vibration noticed throughout cab and through steering wheel ONLY when foot off clutch...smooth as soon as clutch depressed.
- Giving it a little gas (at constant speed) usually smooths out symptoms somewhat.
- Recently had bed loaded to gross. Vibrations went away, to return once bed empty.
- MT fluid found to be full, in good condition, and with 15k mi since change.
So, what's up? Given that a load in the bed improves things, I was thinking U-joints: but the driveshaft spins in neutral, too, so why would pressing the clutch change anything? I also thought about tired clutch bearings, but everything I've read says pressing the clutch makes things worse, not better.
Is it worth examining the tranny-to-engine bolts?
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I have a 2004 F150 4x4 Fx4 supercrew with 5.4 engine and 46,000 miles. For the past three weeks now I have a periodic Grinding /scraping sound that seems to be coming from the front passenger's side of the truck. It can come on with light driving and braking in town or start while driving 70 mph down the interstate without even touching my brakes. The thing is I just about always have to come to a complete stop to make it go away. 10 Minutes later it comes again. It's loud enough for everyone around me to start staring at my truck. Sounds like metal scraping concrete and gets deeper as I slow down and when I fully press my brake pedal it goes "curchunk and the sound is gone for a while. I thought maybe my caliper was sticking or maybe the truck is trying to go into 4x4. One friend even suggested me to check the dust cover behind the brake for rocks.
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Noise is there at start up and when hot. Noise went away for about 1000 miles after changing the oil, but them came back. Truck runs, shifts, and drives great, with no other issues.
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FDST usually starts to squeak after the car has warmed up.
It is not constant, but does seem to be consistent as a the tire rotates (as if it is the same spot(s) per tire revolution).
It is audible mainly during acceleration at low speeds (less than 50 km/h).
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I have a 2000 F150, 94k miles, manual transmission, 2WD
About 6 months ago a slight squeaking sound started when only backing up. Now its progressed to a sort of grinding metal on metal sound with regular driving as well as in reverse. I can hear it the most when its in gear and I take my foot off the gas. I changed the breaks, checked the wheel bearings, did a clutch test, and the u joints look fine. Something weird happened yesterday, while raining out, it didn't make a peep. My drive shaft and u joints have a layer of rust on them...could that be a cause of the noise, and it went away when wet?
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when it happens, it sounds like if I dragged a big sheet of metal on the road behind the truck. I'm sort of suspicious this sound is from the rear limited-slip differential. Could it be the diff clutches are corroded? Coming loose from their moorings? A differential bearing on the fritz?
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1. When present, the vibration comes in very mildly at 50 MPH and peaks at 65 MPH, then dropping to barely discernible at 85 MPH.
2. The car shudders under the vibration, at worst resonating interior items and can be felt through the seat.
3. The vibration ceases IMMEDIATELY at any speed when coasting with the throttle backed off.
4. Curiously, the vibration seems to be much more noticeable after about an hour's drive. Before that, not so much.
5. VAG-COM does not indicate any misfires... I was sure I have a bad coil/plug... but the controller shows no such evidence. The throttle-on shake feels like a miss.
6. Brakes on/off makes no difference.
7. Road surface does not make any difference.
8. Near new (2K miles) Yokohama YK 580 all around, stock rims. If it's balance, I doubt it would decrease at higher speed (being sub-critical). Likewise for belt bubbles or other tire flaws.
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Is this just because I have lowered the car and have not yet gotten an alignment done? I'm waiting a few weeks for the suspension to settle before I do that. It does look like my front camber is off a bit, but it's hard to tell for sure. I haven't had this happen before, and it doesn't happen continuously. Will an alignment remedy this?
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82000 kilometres on my 2012 v. 16 inch wheels. Serviced at the dealership right on schedule since new. Last service at 80000 they said the tires are at 2/32 tread depth and recommended replacement. Michelin energy savers, original tires. My monthly driving is only around 600 km so I decided to wait till the spring to change them.
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