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  #1  
Old 11-01-2014, 04:42 PM
randyj68 randyj68 is offline
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front end vibration/shaking

I've had my 68 f100 for a few years now and only have driven it on short trips because of old tires. The truck was originally a 390-3 on the tree but now has a 5.0 5 speed..upgraded to front disc brakes. .new shocks and bushings in the front end. Finally put on a new set of tires and went out for a spin on the interstate. .....I have a vibration when I get above 70/75.....any suggestions
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  #2  
Old 11-01-2014, 05:34 PM
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How's the alignment of the tranny tail shaft to the rear pinion yoke.
Back in the 60's, I rough cut with a cutting torch my tranny cross member to move the mount back 4" cutting some off each side. And ended up being off center line about 1/2"got had a vibration around the same speeds.. I did not really notice it while working up close to it, but after raising *** end up. I could see how it was off center. Redrilled the tranny mounting holes to correct the problem. Fixed the it.

Rear tires may need balancing.
If you had a new drive line made have rechecked alignment and high speed balanced.

Orich
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1971 F250 4wd Nv4500-5spd O/D 416cid owned since 1978. Toured Vietnam 1968-70 15 months 512th Trans Co. Driver of the Iron Butterfly Gun truck http://www.youtube.com/watch?v=5H7U71KZEJw
http://www.youtube.com/watch?v=Lemll...r_embedded#t=0 & http://www.youtube.com/watch?v=119sc1w8J2Y#t=2
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  #3  
Old 11-01-2014, 05:35 PM
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Sure... check your pinion angles... they have to be equal or within 2° of each other. The closer ya get them the less likely it'll have a vibration.
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Old 11-01-2014, 05:40 PM
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I have the same problem. New shocks helped a lot, but I'm still trying to nail down exactly what it is. Not sure if it's in the front or rear. I suspect my front tires are what's causing it, but they have good tread left so I can't justify replacing them just yet.
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Old 11-01-2014, 09:40 PM
ultraranger ultraranger is offline
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U-joints that are bad or are going bad can also cause a shaking/vibration problem.
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  #6  
Old 11-01-2014, 11:14 PM
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I found that to stay a way from shops with older balancing Equipment.
You get a poor balancing job most the time..

Plus who's doing it. The younger the guy don't seem really to care.
As most people I've talked to just accept what the tech does when the vehicle rolls out of the shop.

But if you drive a truck and have some what large tires and return back to the shop the 3rd time with a week or so the older tire tech ends up balancing them with much better balancing job. Also in all the shop the have the newest balancing Equipment they just take spin at low rpm, up to about 100 rpm.

But hell, I don't always drive at 50-60 but 65-70 when a crappy balancing job is also real noticeable.
Since my truck is 4wd with 33" tall tires not real big. I can't seem to get a good first balancing job. Driving at 55-63 is when it is first noticeable then back 68-75mph

I now rotate my own tires with out getting them rebalanced since using these Centramatic Wheel Balancers front and back has smooth out my ride almost a good as my car 06 Murano ride at 70 mph.

Yes they are well worth it having a 4wd that no one like to balance tires on for driving over 50 mph..
Orich
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1971 F250 4wd Nv4500-5spd O/D 416cid owned since 1978. Toured Vietnam 1968-70 15 months 512th Trans Co. Driver of the Iron Butterfly Gun truck http://www.youtube.com/watch?v=5H7U71KZEJw
http://www.youtube.com/watch?v=Lemll...r_embedded#t=0 & http://www.youtube.com/watch?v=119sc1w8J2Y#t=2
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Old 11-02-2014, 06:20 PM
randyj68 randyj68 is offline
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Pinion angle is good as far as i know. . It seems to be concentrated in the front end.....shake seems more in the steering wheel....not in the seat. I've only drove it locally. ..not really getting above 65/70. I wanted to actually stretch/wind it out for the first time and disappointed/concerned on what it might be.
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Old 11-02-2014, 06:57 PM
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Check ur wheel bearing slop if you can shake the wheels at the top maybe you'll find it there. Check tie rod ends. Some guys try moving front tires to the rear then test drive.
trying to find the cause.. Or Take it into a shop and have them check the whole front end for looseness..
Orich
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1971 F250 4wd Nv4500-5spd O/D 416cid owned since 1978. Toured Vietnam 1968-70 15 months 512th Trans Co. Driver of the Iron Butterfly Gun truck http://www.youtube.com/watch?v=5H7U71KZEJw
http://www.youtube.com/watch?v=Lemll...r_embedded#t=0 & http://www.youtube.com/watch?v=119sc1w8J2Y#t=2
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Old 11-02-2014, 08:43 PM
CougarJohn CougarJohn is offline
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Try this:
When you feel the chop hold the throttle and gently apply the e-brake. If the chop goes away it is not rear tire balance.
Then touch the hydraulics. If it goes away then it is probably front tire or wheel imbalance.
Bad steering and suspension will not in itself cause a vibration. It will amplify what is there.
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Old 11-02-2014, 08:47 PM
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Quote:
Originally Posted by CougarJohn View Post
Try this: When you feel the chop hold the throttle and gently apply the e-brake. If the chop goes away it is not rear tire balance. Then touch the hydraulics. If it goes away then it is probably front tire or wheel imbalance. Bad steering and suspension will not in itself cause a vibration. It will amplify what is there.
Hmm, I'll try that too. My E brake doesn't do much, but it's worth a try.
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Old 11-03-2014, 08:03 PM
randyj68 randyj68 is offline
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all sounds great. I'll give them a try Saturday and post results
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Old 11-09-2014, 07:36 PM
randyj68 randyj68 is offline
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Well, I pulled the front wheels off.....no bearing play, re greased everything, checked kingpins and all is good. I can put it in neutral when the vibration starts and same thing, may have the tire shop re balance the tires, only been driven 40 miles since install but who knows
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Old 11-09-2014, 08:22 PM
bert cook bert cook is offline
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Question

you might check out your radius arm bushings
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Old 11-09-2014, 09:44 PM
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Quote:
Originally Posted by bert cook View Post
you might check out your radius arm bushings
Those can cause it but I replaced mine and it still does it.
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Old 11-09-2014, 09:44 PM
 
 
 
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