shaking f-150
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shaking f-150
hey guys,
I have a 1985 f-150 300ci with the manual 4-speed od tranny. When I engage it in gear and easy off the clutch the truck shakes pretty bad. When letting off the clutch, the shake is lessened when I increase the rpm during clutch engagment and take-off. The truck also shakes when braking. I have replaced the driver side motor mount and the transmission mount. I would have replaced the pass. side motor mount but it is a little hard to get to that upper bolt. I believe this mount is okay and was just replacing it since I did the other side. I really do not know how to check the condition of my u-joints. It has the single driveshaft. I got up under it to check the u-joints and the only thing that seemed wierd was that where the driveshaft connects to the tranny, there was a little movement. Also at this connection, there seems to be fluid (oil) seeping out passed the seal. Any ideas on why this truck is shaking at take-off and braking? thanx
I have a 1985 f-150 300ci with the manual 4-speed od tranny. When I engage it in gear and easy off the clutch the truck shakes pretty bad. When letting off the clutch, the shake is lessened when I increase the rpm during clutch engagment and take-off. The truck also shakes when braking. I have replaced the driver side motor mount and the transmission mount. I would have replaced the pass. side motor mount but it is a little hard to get to that upper bolt. I believe this mount is okay and was just replacing it since I did the other side. I really do not know how to check the condition of my u-joints. It has the single driveshaft. I got up under it to check the u-joints and the only thing that seemed wierd was that where the driveshaft connects to the tranny, there was a little movement. Also at this connection, there seems to be fluid (oil) seeping out passed the seal. Any ideas on why this truck is shaking at take-off and braking? thanx
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thanx for reply. It is possible that the rear crank seal is leaking. Would this cause the problem (the possible clutch issue you indicated). The same affect I'm experiencing with take-off is the same affect exhibited when braking which leads me to believe it is a related problem. Also the shocks are really old on this vehicle. Would this contribute to the problem? What about the previous question concerning the output shaft of the transmission where it comes together with the driveshaft moving a little bit? Others please chime in with your thoughts. Anyone in the Louisville, Ky area available to test drive my ride and troubleshoot the problem?
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Does it do it when you rev the engine in neutral in the driveway? If it does, I would say it's something wrong with the engine.
If the engine runs good and smooth, I would look at the rearend/springs. Make sure the rearend brackets and such are not rusted through, and make sure the spring hangers are not rusted. If the rearend is flopping around back there, it can cause the driveshaft angle to be out of wack.
If the engine runs good and smooth, I would look at the rearend/springs. Make sure the rearend brackets and such are not rusted through, and make sure the spring hangers are not rusted. If the rearend is flopping around back there, it can cause the driveshaft angle to be out of wack.
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Originally Posted by Franklin2
Does it do it when you rev the engine in neutral in the driveway? If it does, I would say it's something wrong with the engine.
Originally Posted by Franklin2
Make sure the rearend brackets and such are not rusted through, and make sure the spring hangers are not rusted.
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From: Texas
Originally Posted by inline6fanatic
The shaking primarily starts in the rear if the helps any of you gurus out there for diagnosis.
If everything seems okay, start the truck with the rear wheels off the ground, shift into first gear easing the the clutch as you normally would. Note if there is any grabbing or chugging noises. If yes, then your clutch surface may be contaminated as you suspected. The clutch should engage the transmission into gear smoothly and without any noises at all.
Last edited by 82F1507.5; Feb 23, 2007 at 03:47 PM.
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Check the Bell Housing!!! I had a similiar problem. I thought it was clutch related and it kinda was. When I crawled under the truck, the bell housing was completely cracked, get a flashlight and check, I had a crack all the way around, and only one bolt was holding me in place. Granted the flywheel and clutch got replaced. At the same time I did find 2 loose U bolts on the rear axle.
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Originally Posted by aj197816134
Inline, any luck with your problem?
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Keep me posted. I can tell you it was annoying, it would go away as i sped up, and taking off it shook, but it then got worse. Bell Housings are about 45 50 bucks or less at junk yards. Check everything out, could be something else, but its a process of elimination. Removing the tranny to check and do the clutch isnt too bad. Acutally you can disconnect the driveshafts, remove the shifter and slide the whole assembly back, I have dne this to repalce the clutch. Keep me posted
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The more I sit here and theorize about the situation, I think it has to due with my rear seal leaking. Where the bellhousing and the engine block meet, there is definitely fluid seeping out. So when I ease off the clutch, the clutch basically is "catching" and "slipping" due to the possibility of this fluid contaimenating (sp?) the clutch surface. Will keep ya'll posted on my findings.
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