F150 "jumps" when pulling a trailer
#17
Also in Austin... Also new to trailering and have a 2002 FX4. Mine was doing the EXACT same thing until I realized that the pin was a Class II pin and the receiver a Class III/IV. The pin diameter is completely different. That little difference prevented the ball mount from slipping in and out the extra 1/8th inch and made the difference. Maybe that is all there is to it?
#19
#20
Check your tongue weight and your hitch height. Are the trailers you are pulling tandem axle? With a tandem axle trailer if the hitch height is wrong it will unload one set of wheels and beat you around when you go over bumps and stuff. If the tongue is too light it will bounce the truck up and down and that could be construed as a jerking motion. The fix for that is more tongue weight or adjusting the hitch height to make everything happy. If you are using a weight distributing hitch try loosening the bars a bit to put more load on the tongue. If you can post more info on the kind of trailer (axles and such), and maybe we can narrow it down a little more.
Whoops!!!..... didn't see that last post saying you got it. My bad.
Whoops!!!..... didn't see that last post saying you got it. My bad.
#23
Just came across your post, I had the same problem. My problem was the springs, I know you have HD springs but you may have stressed them. I had the whole drive line either replaced or balanced. I added some Helwig HD springs and that solved the problem. What was happening was the rear end was sagging on take off and the pinion angle changed causing vibration.
#24
#25
Ok, a friend of mine had a similar issue.
the pin that secures your reciever hitch comes in two sizes. He was using the smaller size in a hitch that required the larger size. This left alot of "slop" in the receiver hitch and was extrememly noticable when towing.
Just a thought.
good luck!
the pin that secures your reciever hitch comes in two sizes. He was using the smaller size in a hitch that required the larger size. This left alot of "slop" in the receiver hitch and was extrememly noticable when towing.
Just a thought.
good luck!