Question about Ford F-450

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REAR END STARTS TO WANDER AND FISHTAIL WITH TRAILER @ 60+ mph. Truck has 60,000 Miles, new 19.5 kellys, Had new set toyos for 4,000 miles same problem, Inside duallls went out round,all cupped???????? Truck empty when changing lanes acts like 68 Olds wagon that is overloaded, rear has floating feeling, Suspension has been ck, OK???? This truck is 2008,F-450 DRW 6.4 Twin Turbo diesel. let me know bgw@vfn-inc.com

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As I understand this question, your towing vehicle starts to sway back and forth at about 60 MPH when you have your trailer attached to the vehicle. If this is correct ... lets move forward. You don't say a word about your trailer but I will assume we are not talking about a small trailer, we are talking about something that weighs more than 3,000 pounds. You don't say anything about the hitch either. I am going to presume you have a weight distributing hitch and I am going to assume you have the proper springs attached and they are adjusted properly. My general comments will apply whether this is a travel trailer or a large utility trailer.

If your load is not properly distributed, you will experience this very dangerous situation. You must have between 60" and 70% of the weight in the front of the trailer wheels. When the trailer is heavy in the end, it wants to swing (the rear actually wants to be in the front. Think how an arrow travels. It is heavy in the front. If you put weight on the back of an arrow and shoot it, the rear will pass the front.)

The only way to stop this dangerous swaying once it starts is to slow the trailer or increase the speed of the tow vehicle. THIS IS A VERY SLIPPERY SLOPE! In an emergency, you would first apply the trailer breaks and gently apply gas until you regain control ... then bring the rig to a stop. NEXT, reload the trailer so 60 to 70 of the weight is at or near the tongue of the trailer.

If you have all the proper weight distribution, you need to check the tension on your torsion springs. You may want to consider dual cam anti sway from Reese. I suggest that if you have not been instructed in proper connection techniques of your very large trailer, go to your local Reese or Valley hitch distributor and have a chat with the technician. It might even be worth $20.00 for the lesson.

Please do not post personal identifying information at this web site for your own safety and security.

I hope this helps you ... let me know what happens.

Thank you for your interest in FixYa.com

Posted on Mar 14, 2011

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