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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

What would cause "lunging"?

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Old Aug 18, 2014 | 12:38 AM
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slashfan7964
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Fleet Mechanic
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From: Indian Falls, New York
Originally Posted by FordFETruck
Not sure. Maybe it's the 133" wheelbase?
No, because it happens in Broncos too, and they have a 108" wheelbase.

I would imagine it also happens on extended and supercab trucks as well, though I have no evidence to prove this to be true as I have never been in either of these 3 generations.

Originally Posted by Patrick Omally

Balancing doesn't work if there is water inside the tire. balancing also can't fix a slightly bulging tire.

What we need, is someone to test this with and without a heavy load in their trucks. same road, same speed, different amount in the truck bed. See if the problem gets better or worse. Also video!
These tires were balanced bone dry by my hand on a digital machine down to a 0/0 weight balance using steel weights after the state banned lead. They were definitely perfect balance when removed from it. I can understand what you are saying as how it could potentially cause this, but I can assure you it happens without either of those interfering, that's for sure.

I wonder if the TTB axle has something to do with it based on its design. Its done it on both leaf sprung and radius arm TTB front ends. I mean, its a long shot, but who knows. Its also done it with added leafs and aftermarket gas shocks.

If it also matters, all times I have experience it are with semi float axles, but I don't think that would make a difference.

Number of springs or stiffness must not make a difference as it does it on stock 1/2 ton, 3/4 ton and modified 3/4 ton springs.

It does seem to do it on even pavement more than bumpy, at least on smooth pavement is when I can feel it, of course because of no bumper interference.

I agree with your idea on the videos. The problem is, this seems to be more random than anything so capturing it on film may prove tough unless someone has a camera with enough memory to film an entire ride.
 
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