6 Spd Flapping Noise Under Load

[WCrovo]

Am preparing to do battle over the flaping noise in drive train up hill under 3/4 load. Any one have a resoloution for this problem? Dlr said he has had other complaints but dose know of a fix. The noise is weird.

 

[Larry Willard]

I, along with several others had what I think you are hearing, as if you have a bad tire? Carson Dodge relocated the heater hose in the head to the next tapping forward in the head. This took care of almost all the noise to the point that we no longer pay any attention to it now.

Larry

 

[joesoot]

Define flapping.

Mine growls like bias ply tires above 2200 RPM on a grade, once I crest the hill, the sound goes away till next grade.

 

[merryman]

Try a search under "flapping noise", Evan Beck provided what seemed to me to be a convincing and authoratative explaination for this noise--had to do with passage of air in the turbo. I have it often and had tried the earlier "fixes" such as removing the air box snorkel, and such. I have not tried the re-locate the heater hose, but one of our members earlier reported that as a cure.



Vaughn

 

[Happy Camper]

Sounds like a flat tire and I have learned to ignore it. Someday I will have a problem when it really is a flat tire!!

 

[WCrovo]

Yeah it sounds like a flat tire. I quess it could be the turbulance in the intake, my 99 auto didn't do it at all. I haven't heard of the heater hose relocation but I will give Carson a call in the AM. I could live with it if I knew it was coolant gushing around. Sounds like a chunk of tire is partialy torn off the caseing and every time it goes around it slaps the ground before the weight of the trucks rolls over it. WEIRD.

 

[klenger]

It's amazing that so many of us are hearing this noise, describing it the same way, but no one can seem to figure out where it's comming from. This is weird. I donate a 6 pack to the guy who figures it out.

 

[DarrellB]

That's what you get for having an extra gear.



Sorry had to say it



No flapping on my 5spd.



Big D

 

[Augustus]

I have the same flapping noise on my 5-speed, I thought it started after I put on new tires, from reading this I guess not. So far I have been able to ignore it. I hope someone can figure out where it is coming from.

 

[D White]

Had the same noise in our 3500, H/O. Only noticed it when pulling a hill with about 10K. Sounded like it was coming from the turbo, so out of curiosity I pulled the silencer ring. No more noise. Don't know if it's a cure-all, but it worked for me. Maybe the noise is still there and can't be heard over the extra whine!!



Hopefully it works for somebody else.



Doug

 

[Steve M]

This is copied from my reply on the RV site forum about the same subject. When sound waves crash into each other, they make strange noises...

I've heard this noise like a helicopter flapping overhead several times. As a long shot in the dark, I have to beleave it's accoustics of low frequency and high decibal sound reverberating off of the atmosphere. I have a db meter and have recorded sound waves too deep to hear but register 95db plus on the meter in the cab with the windows up. Our diesels are very loud in the low frequency ranges. While we hear the clatter at about 65-75db, the real noise is at lower hard to hear frequencies of 95+db. My Harley with straight pipes also does this at idle on hot humid days. From a distance it cackles but sitting on it gives that annoying helicopter bop. On cool dry days, it's a cackling ca-di-llac rythm. Ok, call my nuts!!!