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  #1  
Old 03-17-2011, 06:16 PM
Riq21 Riq21 is offline
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Default shaking at speed

Saw many posts on the shaking phenom when the truck is going between 65 and 70 ish. In order of probability, what do you think would be the most common cause if I already know my tires, wheels and brakes are in good shape. Vibration seems to come from the seat and not the steering wheel.

Rear end
Drive shaft
U joints

Seems like my u joints are ok, but appears to be significant lash in rear end when I rotate elevated wheel back and forth-sort of clunking noise to be exact. If the thought is that I am experiencing a rear end issue, what are the most common issues that could cause the clunking back there. (really don't hear it clunk when I am driving the truck)

Truck runs great otherwise, but a pain to drive at speeds on the highway as the vibration is significant to say the least.
TIS
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  #2  
Old 03-17-2011, 06:37 PM
DieHard4rd DieHard4rd is offline
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Default Re: shaking at speed

Buddy of mine with an 02 Ranger had the same thing. His was U joints even thou my guess was tires.
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  #3  
Old 03-17-2011, 07:20 PM
FFSHOKE FFSHOKE is offline
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Default Re: shaking at speed

i just had this problem and it turned out to be warped rotors, i didnt make sense to me at first but new rotors and pads and its stopped so its prolly worth looking into it
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  #4  
Old 03-19-2011, 06:41 PM
KC2001 KC2001 is offline
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Default Re: shaking at speed

ive got the same problem in my 01. Starts shaking around 65-up. almost like driving on a rumble stip on the side of the interstate. i replaced u-joints and it didnt help. im planning on balancing the driveshaft and check the trans mount. im hoping there is nothing wrong with the rearend
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  #5  
Old 03-21-2011, 08:08 PM
zekew64 zekew64 is offline
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Default Re: shaking at speed

I've got something similar going on. However, the one thing that I notice nobody says anything about might be rear bearings, in that they may be worn or need to be regreased.

Also, I notice the rumbling more with the driveshaft at the front end, under my seat, so I'm thinking that the output shaft for the trans is worn, and letting a bunch of play happen, which in turn is transferred to the driveshaft. But it could also be a balance of the driveshaft issue; however, I'm not completely sure. But, if you have a manual trans like I do, I also notice most of it goes away if I only stay in 4th gear, and don't shift to Overdrive until I'm at least at 60 MPH.
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  #6  
Old 03-22-2011, 04:17 PM
Riq21 Riq21 is offline
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Default Re: shaking at speed

Went to another shop yesterday and had them check the balance of the tires. They stated that 3 of the 4 tires had too much runout in them and could not be balanced. This is not the tire shop where the tires were originally purchased. Went back to original shop today and had they found two tires that did not pass their runout spec. After the two were replaced, I hit the highway and got it up to speed. (all the way to 85) There is still some vibration at the 65-70 range, but I would say it is about 50% better than what it was. Think I might change the u-joints before I harrass the tire store anymore, but if that does not improve it some, I see two more new tires in my future. Way too much time spent on this shit!
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  #7  
Old 03-22-2011, 06:43 PM
WildlandFirefighter WildlandFirefighter is offline
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Default Re: shaking at speed

Also check your driveshafts nut that holds it to the rear axle. You have to unbolt the driveshaft and there will be a bolt in the flange.
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  #8  
Old 03-23-2011, 12:52 PM
Riq21 Riq21 is offline
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Default Re: shaking at speed

Not being one to safisfy easily, I changed out the u-joints today. Interesting stuff I learned today.... Got the parts from Advance and got home to dis-assembly. Marked everything properly and pulled the drive shaft to the basement where I have better work space. Removed old u-joints with little problem, but when I went to install the new one, I found that two of the caps were oversize and would not fit any of the holes in the drive shaft of the spline sections. Two caps were approx 1.162 and the other caps were 1.775 or so. 1.162 is what is needed all around. Went back to Advance and did some searching and found out the the driveshaft was for an automatic rather that a standard.... Not sure is this is an issue, so go the appropriate u-joints for the job. Went back together easily and went for a quick test ride. The car really rides more smoothly through the gears and gave me just a slight shake when I was about 70 mph. I went up to 85 and it really was pretty smooth. All things considered, I think I have eliminated about 85% of the vibration from the truck. (Not sure how much is inherant with this vehicle) I think I am going to drop air in the tires to about 32 pounds from the 35 that are now in them and see it that matters. Just wanted to share that I am making progress and what I have done so far.

Comments are welcome.
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  #9  
Old 03-23-2011, 02:22 PM
Acroma Acroma is offline
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Default

When I first got my truck I had to rotate the tires because the shaking was so bad. Come to find the 15 year old tires were worn on the inside. After the rotation, shakes went away. Should last one more year before I need new ones.
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  #10  
Old 03-23-2011, 05:43 PM
GSev61 GSev61 is offline
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Join Date: Mar 2011
Posts: 2
Default Re: shaking at speed

Just signed up tonight - I've had similar issues.

Mine started with occaisonal "clunk" when coming to stop, and starting forward from stop. Ford dealer said u-joints on the furthest rear drive shaft (double-shaft type) bad. Replaced joints and carrier bearing (elsewhere), and EXTREME vibration. Rotated axle 180 degrees, better. Took to shop, lifted and ran in drive while on lift - sounded like wheel bearing.

Then got into the rear differential - problem not the wheel bearings, but bad spider bearings (okay, getting a bit over my head now). Plus brakes in bad shape. Oh, rear leaf spring shackles almost rusted out, so replaced them while at the shop.

My concern now is, I bought recently for $1000. Paid about $350 for the 3 u-joints, spark plug replacement, and carrier bearing. Shackles, oil change, check of other drive train oils for metal bits (they were fine), and tire rotation was about another $600. My $1k deal is now a $2k toleration, but the rear differential system needs rework.

What's most effiecient and cost effective at this point - rebuild the system (how much time/$ ?), or perhaps locate (somewhere) a used diffy system in fair shape (how?). I really don't want to get rid of the truck - new tires/exhaust, engine runs tight (maybe 200k miles), body in good shape. Just having trouble turning my $1k truck into a $4k truck to keep it going. HELP?!?! Suggestions?
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  #11  
Old 03-23-2011, 05:43 PM
GSev61 GSev61 is offline
Guy
 
Join Date: Mar 2011
Posts: 2
Default Re: shaking at speed

Just signed up tonight - I've had similar issues.

Mine started with occaisonal "clunk" when coming to stop, and starting forward from stop. Ford dealer said u-joints on the furthest rear drive shaft (double-shaft type) bad. Replaced joints and carrier bearing (elsewhere), and EXTREME vibration. Rotated axle 180 degrees, better. Took to shop, lifted and ran in drive while on lift - sounded like wheel bearing.

Then got into the rear differential - problem not the wheel bearings, but bad spider bearings (okay, getting a bit over my head now). Plus brakes in bad shape. Oh, rear leaf spring shackles almost rusted out, so replaced them while at the shop.

My concern now is, I bought recently for $1000. Paid about $350 for the 3 u-joints, spark plug replacement, and carrier bearing. Shackles, oil change, check of other drive train oils for metal bits (they were fine), and tire rotation was about another $600. My $1k deal is now a $2k toleration, but the rear differential system needs rework.

What's most effiecient and cost effective at this point - rebuild the system (how much time/$ ?), or perhaps locate (somewhere) a used diffy system in fair shape (how?). I really don't want to get rid of the truck - new tires/exhaust, engine runs tight (maybe 200k miles), body in good shape. Just having trouble turning my $1k truck into a $4k truck to keep it going. HELP?!?! Suggestions?
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  #12  
Old 03-25-2011, 05:07 PM
Riq21 Riq21 is offline
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Posts: 151
Default Re: shaking at speed

More follow up; after dogging out the tire dealer for new tires and changing the U-joints, I dropped the pressure in the tires to about 32 from 35 LBS and about 99% of the vibration is gone. I think I can stop now and be happy with what I have. Bottom line was it was several things causing the vibration, mostly neglect from the previous driver (college student son of mine) and faulty parts and workmanship from the tire dealer that created the problem. I don't not know how normal working folks would ever resolve issues like this with the amount of time it has taken me. I am retired and am just playing around enjoying the challgnge.
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