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Open Roads Forum  >  Fifth-Wheels

 > Please help me identify 5th wheel towing issue.

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TXiceman

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Posted: 08/07/19 11:15am Link  |  Quote  |  Print  |  Notify Moderator

Sounds like you are most likely a bit light on the pin. Weigh the rig and find out what your real pin weight is when loaded for travel. On a 5er you want to be around 20% of the loaded trailer weight. Lighter pin weights tend to have more chucking.

You can get chucking with any rig and it will very according to the road. We have a Demco Glide pinbox and a TrailerSaver TS3 air ride hitch. Most roads we do fine. every once in awhile get get some chucking. I just slow down a bit.

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laknox

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Posted: 08/07/19 02:43pm Link  |  Quote  |  Print  |  Notify Moderator

azdryheat wrote:

5th wheels are similar in design to see-saws, they pivot in the middle and the ends go up and down. Not gonna be any fix for that.


OP's talking about chucking, which is fore and aft movement. "Porpoising" is the up and down movement of the pin.

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thomas201

Eastern Panhandle WV

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Posted: 08/07/19 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

Since it hurts nothing, just ignore it.

ZeeLet50

Alden, New York

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Posted: 08/08/19 07:08am Link  |  Quote  |  Print  |  Notify Moderator

thomas201, if you drive for 3 or more hours with the fore and aft jerking, it gets old. Sometimes it makes my dog sick and she pukes. It only hurts the body not the rig. LOL


2017 Grand Design Reflection 303RLS towed by a 2016 GMC 2500HD gas with Andersen hitch and B&W turnover ball mount.

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Posted: 08/11/19 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

My GUESS would be that you are a little nose-high. When you head up a hill, the back end drops and the front raises. I'd suggest checking your level when hitched up. Need to be slightly nose-down, rather than slightly nose up.

Super_Dave

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Posted: 08/11/19 06:10pm Link  |  Quote  |  Print  |  Notify Moderator

Does the jerking feel like it is from the front or back? On uphill on ramps I get heavy jerking from my torque converter and gear shifts.


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ependydad

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Posted: 08/12/19 09:19am Link  |  Quote  |  Print  |  Notify Moderator

My experience with a pin light fifth wheel (15.5% measured) and the Andersen was exactly as you described. It was a nightmare for us and we ultimately replaced it after just a couple of months. It caused my wife significant pin while towing.

I first towed that setup with my B&W Companion and didn’t experience the same jerkiness. I traded that out for the Andersen due to the weight of my trailer (21k) vs the ratings on the B&W (20k for the post version).

I went crazy and switched to the TrailerSaver TS3. It’s comically heavy but the full air ride hitch is amazing.

Longest story shortest: ditch the Andersen.


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ZeeLet50

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Posted: 08/13/19 06:16am Link  |  Quote  |  Print  |  Notify Moderator

Super_Dave, feels like its coming from the back and I have suspicions that it might be somewhat to do with the trans. I only have 26k on the truck. Was going to have a full fluid change out to synthetic but $300 is pricey. ependydad, not ready to ditch the Andersen yet. I love the fact that its easy to hook up and lightweight.Want to exhaust all possibilities first. I plan on getting the rig weighed to help troubleshooting.

garyp4951

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Posted: 08/13/19 06:47am Link  |  Quote  |  Print  |  Notify Moderator

I don't think its the tranny, because I experienced the same thing years ago with a gas truck pulling a heavy load. It is a pulsing surging feeling that only stops when you back off the throttle.

94-D2

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Posted: 08/13/19 12:48pm Link  |  Quote  |  Print  |  Notify Moderator

This may or may not be related to your problem, however I will relate my experience with a similar situation.

I have @ 99 Dodge Ram Cummins 2500 with the 47re transmission. I had it heavy duty built for pulling with a triple plate torque converter. Is was so strong that I was warned to be carful when the converter locked up because it will break a shaft if your foot is I. It under a load. My problem came when I would climb a grade in over drive and locked. It would chuck, or buck like an engine miss but without the sound or the tach showing it. I learned that if I backed out of the throttle and got out of overdrive, the bucking would stop. I eventually learned that the condition was the torque converter slipping against the plate while in the locked position with a load on it. If I full throttled the rig while it was chucking, it would downshift out of locked and stop. However, if I stayed in it, I would end up going way to fast and That creates all sorts of other problems.

The answer to this problem is to increase pressure in the transmission to create greater physical contact against the plate while in lock up. Only way for that to happen for the 47re is to replace the entire throttle body with an after market and install a switch and fooler board to lock out torque converter lock up. I could do all that but I would effectively be building a manual automatic and further complicating the operation of my exhaust brake since it needs the torque converter lock up to operate. The cheap fix is to lock out over drive and go 50-55 mph up the grade, With 4:10 gearing in my rig with the gearing of the 47re, it is painfully low geared for the highway and very hard to only use about 1/4 throttle for that long a distance. Plus those rpm’s are tough on that Cummins which loves to run at 1800.

Food for thought. I suspect the transmission in the right path to your problem. In either case, the process of elimination is they way to figure it out. Start with the no cost options of elimination and work toward the costly.

Good luck with it.


2018 Ram 3500 Crew Cab Laramie 6.7L, Aisin, air ride, Ram puck prep, SuperGlide 20K auto slide.
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