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I have a 2000 f-150, 2wd, 4.6, extended cab, short bed, all stock. Noticed another post from back in August dealing with a vibration, mine only happens between 45 and 75 MPH and only when under acceleration. Feels like maybe a torque converter or transmission problem. Definitely NOT a tire problem. I have not taken it back to the dealer yet. Anybody have the same problem, or know what it might be? Also having a problem with the trans not wanting to shift upon hard acceleration and then letting off the gas. Might be the so called hard shift problem mentioned in other posts.
Sounds too familiar. I've got a 2000 reg cab auto 4.6. Had bad vibration and resonating at same speeds. Dealer wanted to balance, then swap tires. They did, didn't help. Swapped drive shaft, didn't help. Had wheels off too rebalance tires, then shop foreman thought about rechecking drive shaft. The replacement wasn't any better than original, so they replaced the replacement. Vibration free ever since. Sounds like a good place to start. Oh, dealer called me three days later to tell me he had just received a service bulliten telling how to fix it. Thanks Ford! Good luck.
Had a similar problem. Vibration only felt in the drivers seat, not in steering or peddles. Ford kept trying to balance the new set of Michelins. Took it, '98 Exped. 5.4 Limited Slip, to the Lincoln dealer. He had two F-150 with same problem. First thought it was in the rear axle. After several test replaced transmission, only 28K on vehicle, and vibration is gone... Lincoln dealer was much more thorough. This took about four months and a lot of patience, but it worked. There were engineers from Ford headquarters that came to the Lincoln dealer to assist in the problem resolution. Lincoln kept me informed of the progress and although they had the truck 4 seperate times, it was never longer than 24 hours. No, they didn't offer me a loaner, but I was so happy they agreed that I had a problem I overlooked it. Good luck and forget Ford and go to a Lincoln dealer. Ford never even road tested my truck and I had used the same dealer for routine service for 9 years. They will never see me again.....
An update on my vibration problem (original post). Truck has now been in the shop for 10 DAYS. Dealership called last night said it was ready. Went and test drove, it was NO BETTER than it was when I took it in. So far they have replaced the driveshaft and the motor mounts, both of which had to be special ordered. Took a drive with the shop foreman last night, at least he acknowledges that there is still a problem and agrees it is not the tires. He said he would personally work on it today, we will see. One positive note is I have been in a rent a car, thusfar supplied compliments of the dealership, even after the 5 days the extended warranty paid for it. Hope I get it back soon, will have forgotten what it was like to drive it. Will post final outcome when and if we ever get there.
Another update. Well they kept it 21 days (3 weeks to the day), called me again (3rd time) said it was ready. Test drove with shop foreman and service manager this time, they agreed it WAS NOT fixed yet. They gave up, and they are supposed to meet with the Ford District Engineer late next week. I heard if he cant fix it they will offer me a buy back deal. Do not really want to do that, just want the damn thing fixed. So much for the 100,000 mile extended warranty I bought, can't even get to 20,000.
So far they have put 3 drive shafts, motor mounts, rear end housing, checked the run out multiple times, loosened crossmembers and other mounts, something about cross tieing the bed, and not sure what else. I am tending to think it is in the transmission.
Anyway THEY paid for the renter F150 I had for the 21 days at a cost of over $800. They kept my ticket open and gave me my truck back until next week when the engineer gets in. This is really starting to P_SS ME OFF. Hope this does not happen to ANYBODY else.
I would go straight to the dispute resolution board. The address is in the owners manual. I went through this with my full size Ford conversion van. They didn't waste any time, I opted for the MSRP exchange and am picking up my new vehicle next week. Whole process took about 3 months.
If you want the dealer to take another shot at it, have them look at the front-end and the front brakes. My van vibrated like hell when the front brakes stuck. Ford is having one heck of a time with brake calipers. That twin I beam suspension in the vans and the F series trucks is a real pain in the butt to keep aligned.
I've seen many such vibrations at highway speeds on accel that are traced back to the pinion, either bad angle or runout. Most likely bad pinion angle since the angle changes as you accelerate. The runout will act just like a bad driveshaft since it bolts directly to it. The best driveshaft with a bad pinion face runout will cause a driveshaft speed vibration.
I have a 98 4.6 3:08 rear end 4 spd. auto and although I don't have the vibration I do have a high speed whine that you can hear at 35-45 mph then again at 70 mph and up. Two of the mechanics I have taken it to said that it is a bad pinion and or carrier bearing. I haven't had mine fixed since I am trying to get the guy I bought the truck from to at least pay for half of the repair bill.
George
Now I am really worried. I just bought a new truck. The choices were a Ford F150 or a Toyota Tundra. I went with the Tundra and have been having a terrible time trying to get Toyota to fix a driveline vibration. So I had just about decided to get rid of the piece of junk and by a Ford F150. Then I read these posts and begin to wonder if I would be trading one problem for another. You know, it is strange to me that these manufacturers can not get a simple subassembly down correct that they have been building in some fashion for the past hundred years. I also had a 1994 and 1996 Jeep Grand Cherokee and both vehicles had to have the rear axle assemblies replaced before 10K miles. And I only use the vehicles for going back and forth to work on smooth roads. Is there any way to get a solid driveline anymore?
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