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Old 05-11-2009, 06:34 AM   #1
Phil Eyler
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Rough Ride

I have a question for you long time pullers. I was pulling my 3400 along highway 60 on the way to Rough River Dam State Park in Kentucky this weekend,and it got to porposing, bouncing, chucking, or whatever it's called so badly I couldn't drive over 50 mph.I pull with a Chevy 2500 HD with Duramax/Allison. I've had air bags installed and had about 35lbs of air in each, but that didn't seem to help much.

I had the same problem on certain parts of I26 around Ashville, NC.
Is there something I need to do to my truck or is it something I'll just have to live with?
Thanks for your comments
 
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Old 05-11-2009, 06:42 AM   #2
PowellsMonty
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I-26 is just a terrible road in Asheville, 26 N & S of there is fine. It is the road.
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Old 05-11-2009, 07:23 AM   #3
akf15e
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You might try increasing the pin weight a bit. My pin accounted for about 16% of the total 5er weight. By emptying the rear fresh water tank I was able increase that to over 18%. Keystone recommends 20% minimum. I still get some bucking when crossing expansion joints on bridges, but not nearly as bad as the first time I went out.

You might also try decreasing the air bag psi a bit.
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Old 05-11-2009, 08:13 AM   #4
richfaa
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Pin weight to light could be a part of the Problem. A Mor-Ryde or other similar type pin box will help. Note that you can chuck on a really rough road..pin box ot not...
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Old 05-11-2009, 09:04 AM   #5
Phil Eyler
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I have the Mor-ride, and I don't have any water in my fresh water tank. I could ask my wife to sit on the tongue, but I want to live a little longer. I'll try adding some more weight up front another way. I'll try some of your other suggestions and see if they help. Thanks for your comments.
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Old 05-11-2009, 09:50 AM   #6
jjackflash
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I carry the 50 amp cable coiled in a bucket stored in the Gen. compartment. That'll add some weight to your pin!
I consider our selfs lucky so far,We've had our 3400RL for about a year and a half and have gone about 10,000 miles and have yet felt any chucking or any kind of bad ride.
Jack
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Old 05-11-2009, 11:09 AM   #7
Exnavydiver
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Phil, I drove that road, it doesn't matter what hitch or suspension you have. The way that road is paved it has just the right frequency of rises and dips to set up a synchronized bounce with the truck and the rig hitting rises and dips at the same time. The only solution I have found is to slow down and find another route. That is what we did... Dave P.S. I-95 used to be that way in SC and GA south of Savannah. They are better now..
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Old 05-12-2009, 11:50 AM   #8
indy roadrunner
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I am confused. Pulling with a 2500 - on any other thread you would have comments that the pin weight is too much for a 2500 and here you are advising to add more pin weight!!!!
Oh well in my experiences that has helped some but since I travel pretty light I don't have a lot of weight to shift so I just slow down and take it easy. I have the trailair and air bags also but concrete roads like south of Louisville on I65 there is just nothing to take the chucking out with the different levels of slaps in the roadway.
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Old 05-13-2009, 05:53 AM   #9
PowellsMonty
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I-26 in Asheville by the airport will bounce you without the Montanna.
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Old 05-22-2009, 10:07 AM   #10
sreigle
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I agree with the pinweight and the road comments. If you have the onboard compressor and gauge for your airbags, you might try adjusting the psi while on that road. We did that when we had airbags on our prior truck. It helped a lot although on that particular road, nothing may help much.
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Old 05-22-2009, 10:48 AM   #11
richfaa
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I think Indy has it. A really rough will cause anything to chuck We are on the road and sections of I-70 In Indiana and Illinois caused the 3400 to chuck with the Mor-Ryde pin box and nearly caused Helen and I to Upchuck. Doubt if you need any more pin weight. The inside of the camper looked as if a tornado hit it.
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Old 05-25-2009, 09:55 AM   #12
sreigle
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Phil, I don't suppose you tow on that road often enough to experiment with different psi settings in the airbags? Before you head back home over that road you might try bumping the psi up to 50 or more. On our Ford I had the airbags with compressor incab and could adjust on the fly. On roads like that I'd sometimes bump the pressure up to around 60 before getting rid of most of the movement. I'd have to lower it again when we got back to smoother road or it would be too harsh a ride.
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