violent shake
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violent shake
I have a 85 F250 with a manual tranny. It starts fine and drives up to second gear but when I get it in 3rd or 4th the whole truck shakes violently were I can hardly keep it on the road and it stalls out. Then when I try and start it again if I don't keep my foot on the gas it will stall out. Also when it does this and I push in on the clutch and take it out of gear it still shakes the same. The guy I bought it from put an inline electric fuel pump on it. I checked to wiring and it is fine. I know the tranny needs a new clutch. It also seems like the tranny does not want to pull out of gear when this happens it feels like it is in neutral but the truck still jumps forward when I try to start it again. Is this a fuel problem or a tranny problem? Or both. I already put a new fuel filter on it.
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From: Pittsburgh
So it only shakes in third and fourth or over a certain speed? And it only shakes while moving, regardless of clutch position and keeps shaking regardless of gear?
If so, stick your head under the back of your truck and see if you have a 2 piece driveshaft. if you do check the center support bearing, what you describe is what they do when they start to go bad.
Not the fueling part directly, but i could see how one of these things could make it shake so bad that it would starve for fuel.
They can also shake badly enough that you can't get it in and out of gear while moving, but if you can't get it out of gear while sitting still that's a whole other problem all together that is probably not related to your shake.
Justin
If so, stick your head under the back of your truck and see if you have a 2 piece driveshaft. if you do check the center support bearing, what you describe is what they do when they start to go bad.
Not the fueling part directly, but i could see how one of these things could make it shake so bad that it would starve for fuel.
They can also shake badly enough that you can't get it in and out of gear while moving, but if you can't get it out of gear while sitting still that's a whole other problem all together that is probably not related to your shake.
Justin
Last edited by hoxiii; Sep 18, 2007 at 09:10 AM.
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It is not a 2 piece drive shaft. And it is only hard to pull out of gear after it does that. You have to play with it a little to get it to go into neutral. As far as speed goes about 35-40 mph. But it has gotten worse lately and I don't even make it to 4th gear usually before it starts to shake. It doesn't do it at idle or a stop and I can drive it in 1st or 2nd all day long. I already have the tranny pulled. I was planning on putting an auto back in it anyways (just not this soon). It was an auto before and someone converted it over to a standard. But I can't think of anything else it could be but the tranny.
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From: Pittsburgh
does it smooth out at all in 4th gear? It's odd for a transmission problem to manifest itself in 3rd and 4th since 4th is a straight through shot while 3rd shares it's power path with 1st and 2nd.
BTW- what manual trans is it?
Justin
BTW- what manual trans is it?
Justin
Last edited by hoxiii; Sep 18, 2007 at 10:22 AM.
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Does the shake occur if you rev the motor when the truck is stationary?
If so, does it do it both with the clutch engaged in neutral, & disengaged in gear (while sitting still).It's possible the clutch plate is disintegrating & out of balance; or that an incorrectly balanced flywheel was fitted with the manual trans.
But if the shake only relates to road speed, it's elsewhere - e.g. bent or unbalanced driveshaft
If so, does it do it both with the clutch engaged in neutral, & disengaged in gear (while sitting still).It's possible the clutch plate is disintegrating & out of balance; or that an incorrectly balanced flywheel was fitted with the manual trans.
But if the shake only relates to road speed, it's elsewhere - e.g. bent or unbalanced driveshaft
Last edited by Ken Blythen; Sep 18, 2007 at 02:03 PM.
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My manual '76 did this from 60kph (35mph-ish), and it was a dodgy tailshaft and uni. Got those two things fixed up and it was smooth from then on.
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Originally Posted by uh60
Also when it does this and I push in on the clutch and take it out of gear it still shakes the same.
If it shakes to the point you almost can't keep it on the road, and it continues with the clutch in, or in neutral, it almost sounds like front end stuff.
Check the ball joints, radius arm bushings (that come back to the frame from the front axle), wheel bearings, ect.
Also check the U-joints in the drive shafts.
Last edited by cowmilker; Sep 21, 2007 at 04:54 AM. Reason: spelling
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I just replaced the wheel bearings and that didn't fix it. I doesn't feel like it is in the front suspension. It is a rocking from side to side in the whole truck like there is a football team on each side rocking it back and forth.
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I also had a friend that had a problem he couldn't pin down, until he noticed the tread coming off one of his tires, (he actually got out and walked down the side of the road and watched the tires as his wife drove along slowly).
Another thing I've heard is that you can get water inside the tires (condensation from the air compresser at the gas station?), the tires will ballence out at the speed they are spun at on the spinbalancer, but when they are on the car they act different.
Of course these two things are kinda grabbing at straws.
Another thing I've heard is that you can get water inside the tires (condensation from the air compresser at the gas station?), the tires will ballence out at the speed they are spun at on the spinbalancer, but when they are on the car they act different.
Of course these two things are kinda grabbing at straws.
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Originally Posted by cowmilker
Another thing I've heard is that you can get water inside the tires (condensation from the air compresser at the gas station?), the tires will ballence out at the speed they are spun at on the spinbalancer, but when they are on the car they act different.
.
hope you get this figguered out soon. let us know what was causing this.