Bucking or jerking when towing

[Brian06350]

I have a 2006 F350 Crew cab long box 4X4 SRW. I do have firestone air bags that due help. But it is still there just not as bad. I have looked at a lot of threads and have not seen any fixes to this. My thoughs are bushings for leaf springs, leaf spring to weak, angle of the drive shaft, or something else. Let's see if we can get this one figured out. My question is has anyone got to the bottom of this?

[2006PSDSD]

I have no clue what you're trying to describe. What is jecking???

[Brian06350]

As I said in the title "When Towing". Not light loads. Heavy loads. Like 10,000lbs and more. Some people call it bucking some call it jerking. It is like steping on and off the gas really fast or somthing like that. Seem to be only on the CCLB trucks.

[2006PSDSD]

I've heard it called porpoising too. Maybe too much air in the bags. Trailer weight not distributed right, too much tongue weight?

GN/5th wheel or bumper pull trailer? Maybe a weight dist. hitch for a bumper pull

[2006PSDSD]

I fixed the title for you

[Brian06350]

My 5th wheel camper weights in at 12,000 lbs fully loaded. Hitch weight is 1520 lbs. If I have 50 lbs in the air bags it is not that bad but it is there. I have tryed less and more. 50 is about the best. Just looking I see if anyone fixed this issue.

[lubbock guy]

i have a 36 ft toy hauler fifth wheel, i tow with my 07 F 350 DRW CCLB truck, having two extra tires does help with the bucking, but still depending on the road surface, some bucking is present. the only solution i know of to fix the "bucking" is a "trail air" type of fifth wheel hitch for the trailer. i dont have a trial air type of hitch, so i just live with a little "bucking" now and then when towing.

Originally Posted by Brian06350

My 5th wheel camper weights in at 12,000 lbs fully loaded. Hitch weight is 1520 lbs. If I have 50 lbs in the air bags it is not that bad but it is there. I have tryed less and more. 50 is about the best. Just looking I see if anyone fixed this issue.

[colfaxent]

I have a 2009 SRW 350 CC and it will do it towing my 14,000 lb Cameo 5 th Wheel. Mostly at slower speeds low gears when really putting the coal to it. The only cure I know of is traction bars. It is caused by axle wrap. If losing traction it is even worse. I pulled my 5ver up my road today , about a 1000 ft climb in 1 and 2nd gear and it did it all the way. Lookin in to Traction bars, these long spring trucks all have this tendency. JF

[Brian06350]

I have thought about getting traction bars too. With the springs sitting on top of blocks on the rear axle kinda make this more noticeable. If Ford would have use a leaf springs with more arc in them I don't think this would have been a issue. Anyone towing with traction bar have any axle wrap or bucking or jecking?