bad vibrations
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Joined: Jul 2011
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From: forks
bad vibrations
my 81 f100 just started a new trick that I don't like.i put it 4th gear it and it bucks and viberates i checked the universals and they are good the only thing I have found is some slop in the yoke on the rear end.... 1st thru 3rd are normal
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
It is possible that you have an ignition problem. High load at low RPM puts max stress on the ignition components, so if something is failing, like plugs, plug wires, rotor, or dizzy cap that's when it would do it.
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From: forks
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pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I'm going to assume T-18.
That gearbox is 1:1 in top.
I don't think there should be a reason for it to cause this.
Are you lugging the engine in 4th gear?
That gearbox is 1:1 in top.
I don't think there should be a reason for it to cause this.
Are you lugging the engine in 4th gear?
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