hello. shaking viberation?
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New User
Joined: Jul 2010
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hello. shaking viberation?
hi im new. looked for a into but did not see, i have a 66 shortbed f100 that has been swapped with a 460ci, auto tranny from a 78. at idle my vehicle is fine and smooth, with just a little rise in rpm the vehicle shakes pretty violently then will smooth out when higher rpms are reached. has only had this same problem or know a possible cause. i have been told balancer or flex plate would be first things to check out. i have been on the site for year but never a login member untill now.
Elder User
Joined: Nov 2003
Posts: 778
Likes: 2
From: southeast Idaho
They are right, find out if you have an externally balanced engine or not, or an internally balanced one, and make sure you are using the according flexplate and balancer. Unless its missing or something as you rev it up a little
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
Like 'wdfp' said , balance maybe. my 79 has a balance weight behind the timing cover, if it has been left out it will shake. I thought FMCO started putting them in about78 or 79,not sure. Somebody will know for sure. You can't mix up the flex plates and front crank balancers.
Senior User
Joined: May 2010
Posts: 154
Likes: 0
From: Alaska
Is this when the engine is under load or just sitting, parked?
I'd look through the ign system, especially plugs, which can miss only at certain rpm's sometimes.
My truck shuddered bad under load, and it was a u-joint, and the yoke from the t- case. The worn yoke through me off because I checked the joints first thing and couldn't find any wobble. The joint finally blew, shredding the little u-bolts, and replacing the joint only helped for a week before it blew again. I sent the driveline off to have it balanced, and ordered a new yoke.
My wobbling completely stopped when I replaced the joint, but came back 5 days later because of the yoke
I'd look through the ign system, especially plugs, which can miss only at certain rpm's sometimes.
My truck shuddered bad under load, and it was a u-joint, and the yoke from the t- case. The worn yoke through me off because I checked the joints first thing and couldn't find any wobble. The joint finally blew, shredding the little u-bolts, and replacing the joint only helped for a week before it blew again. I sent the driveline off to have it balanced, and ordered a new yoke.
My wobbling completely stopped when I replaced the joint, but came back 5 days later because of the yoke
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New User
Joined: Jul 2010
Posts: 23
Likes: 0
Is this when the engine is under load or just sitting, parked?
I'd look through the ign system, especially plugs, which can miss only at certain rpm's sometimes.
My truck shuddered bad under load, and it was a u-joint, and the yoke from the t- case. The worn yoke through me off because I checked the joints first thing and couldn't find any wobble. The joint finally blew, shredding the little u-bolts, and replacing the joint only helped for a week before it blew again. I sent the driveline off to have it balanced, and ordered a new yoke.
My wobbling completely stopped when I replaced the joint, but came back 5 days later because of the yoke
I'd look through the ign system, especially plugs, which can miss only at certain rpm's sometimes.
My truck shuddered bad under load, and it was a u-joint, and the yoke from the t- case. The worn yoke through me off because I checked the joints first thing and couldn't find any wobble. The joint finally blew, shredding the little u-bolts, and replacing the joint only helped for a week before it blew again. I sent the driveline off to have it balanced, and ordered a new yoke.
My wobbling completely stopped when I replaced the joint, but came back 5 days later because of the yoke
Posting Guru
Joined: Sep 2003
Posts: 2,313
Likes: 12
From: Northeast LA
If it does it parked, it's not the drive shaft, because that doesn't move till the truck does. My .02, check the balancer to make sure the rubber part isn't squishing out or has deteriorated and let the outside ring weight slip.
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New User
Joined: Jul 2010
Posts: 23
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good idea. i wasent even thinking when i said drive shaft. well i grabbed the balancer of another 460 i have. might install tomorrow and see. cant hurt anything worse. if all else fails ill rebuild it when the body goes to blasting and paint
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Freshman User
Joined: Feb 2010
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From: chana,il
who put the motor in it you or someone else? if it wasn't you i would pull the inspection cover off the flywheel and see if it has a weight on it. if it is a 78 motor it shouldn't have a weight on it, they were internally balanced. in 79 they went to externally balanced and weighted the flywheel and balancer. if it has hthe wrong flywheel on it, it will shake just off idle and drive you nuts. mine had a 73 460 with a79 flywheel on it ,it finally broke the center out of the flywheel and sounded like a wrist pin went out. i changed the flywheel and it runs smooth as silk.
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