2 piece drive shaft to 1

[Andy4639]

Ok guy's I want to know if you have noticed any differances in noise from this swap?

Background:
I wear hearing aids in each ear so my hearing is not what it once was! That being said I need to know if what I'm hearing is just the harmonic's of the drive shaft as I was told buy the installer.

The truck drives fine the steering wheel is steady and no shaking at all. At about 75-80 though I can't stand the noise if I have my hearing aids in. Well if I take them out it's fine. That though doesn't answer the question. I want to know if there is a differant sound in your trucks since you swapped out the drive shaft's.
Thanks, not being able to hear sucks!

[LONGHAIR]

I have never heard of that one? Driveshaft harmonics would cause a vibration, but I don't see how it could make noise......assuming no bad joints.

I have heard countless numbers of dry joints over the years, but that is not the shaft's fault. It is a maintenence issue.

[Andy4639]

Originally Posted by LONGHAIR

I have never heard of that one? Driveshaft harmonics would cause a vibration, but I don't see how it could make noise......assuming no bad joints.

I have heard countless numbers of dry joints over the years, but that is not the shaft's fault. It is a maintenence issue.

This is all new stuff just installed 3-13-14 Thursday on my truck. I'm trying to tell if it's just a new sound with the new 1 peice shaft are is there something wrong with it. The installer say's it fine. I guess I need to get a rider with me and let them hear it and figure out what it is.

[FRANKENSTEINC10]

I have. one piece in my long bed and I don't hear any noise. havent had over 40 yet. I was having a noise at first but noticed a busted exhaust hanger rubbing against. fixed it no noise. I agree that having another rider night help you figure out if there actually is a problem or if maybe just your hearing aids picking up the sound. good luck

[Andy4639]

Originally Posted by FRANKENSTEINC10

I have. one piece in my long bed and I don't hear any noise. havent had over 40 yet. I was having a noise at first but noticed a busted exhaust hanger rubbing against. fixed it no noise. I agree that having another rider night help you figure out if there actually is a problem or if maybe just your hearing aids picking up the sound. good luck

This is my problem. I don't know if it's me are the truck. I was use to hearing my truck sound a certain way and noww it doesn't so I need to figure this out.

[FRANKENSTEINC10]

exactly. my buddy had surgery on his ears and also wears hearing aids in both. he work with heavy machines and he said that before the surgery an hearing aid upgrade the sounds didn't bother him but now he can't stand them in while he works because he can hear every little noise.

[Keith Seymore]

Maybe.

It wouldn't be noise from the U joints, because the frequency emitted by those (2nd order of shaft rotation) is not in the audible range.

However - sometimes a one piece shaft will transmit rear axle mesh frequencies through the air. It's perceived as axle whine, but you can hear it outside the vehicle rather than inside (the GMT400 trucks with a carbon fiber shaft were particularly bad about this). It will vary based on rear axle ratio but should be in the 370 hz range.

I have never heard of a steel shaft doing this but we've never discussed the hearing aid interaction either. (Maybe it's always been there but we didn't have 'bionic ears' to pick it up - lol)

Probably wouldn't be able to tell further without actual testing. But - the good news is you are not damaging anything so I wouldn't worry about it.

K

[Andy4639]

This is something I haven't really thought about. it could be the rear end winning. I have the 4:10 gears so running it at 70-80 MPH could be what I'm hearing.

[Custom 68]

Andy one thing to check would be your pinion, driveshaft and engine angles. I had started changing my rear suspension along with lowering it and the engine install and I had a bad pinion angle. I didn't feel bad or anything but I could hear a harmonic. I made sure my engine and transmission was correct to where I wanted it and finished my lowering and suspension upgrades then cut my perches off and fixed it. That noise went away. You might want to check that in case the shop did not.

[Custom 68]

I went and looked at your pictures again and you look to be ok as mine was obvious at the rear u-joint. You might still check it tho.

[Andy4639]

Originally Posted by Custom 68

I went and looked at your pictures again and you look to be ok as mine was obvious at the rear u-joint. You might still check it tho.

Yes I need to check it out and see. I hope it's just these dang hearing aids!

[Andy4639]

I called Carolina drive shaft who installed the new drive shaft. They said they were in tolerance on the angles. Per there install.

[chuckmc8]

Andy, have a few truck/car friends either ride or drive your truck and see if they have any input on the noise. Of course, dont mention the issue before hand. I've had a few long beds with 1 piece drive shafts and never any weird noise. Don't have any idea about the hearing aids tho...are they High Performance models? ;-)

[brad_man_72]

Driveshafts can ring like a windchime at audible frequencies if they don't have insulation inside them. Many " driveshaft builders" don't stuff their shafts. To check your shaft you can wrap 5-10 layers of duct tape in the center of your shaft to see if the noise changes or goes away completely.

[Keith Seymore]

Originally Posted by brad_man_72

Driveshafts can ring like a windchime at audible frequencies if they don't have insulation inside them. Many " driveshaft builders" don't stuff their shafts. To check your shaft you can wrap 5-10 layers of duct tape in the center of your shaft to see if the noise changes or goes away completely.

Good thought, Brad -

K

[brad_man_72]

Originally Posted by Keith Seymore

Good thought, Brad -

K

I try

I figure between me and you we could figure out just about any driveline issue around here.


Any news?

[slikside]

Originally Posted by Keith Seymore

Maybe.

It wouldn't be noise from the U joints, because the frequency emitted by those (2nd order of shaft rotation) is not in the audible range.

However - sometimes a one piece shaft will transmit rear axle mesh frequencies through the air. It's perceived as axle whine, but you can hear it outside the vehicle rather than inside (the GMT400 trucks with a carbon fiber shaft were particularly bad about this). It will vary based on rear axle ratio but should be in the 370 hz range.

I have never heard of a steel shaft doing this but we've never discussed the hearing aid interaction either. (Maybe it's always been there but we didn't have 'bionic ears' to pick it up - lol)

Probably wouldn't be able to tell further without actual testing. But - the good news is you are not damaging anything so I wouldn't worry about it.

K

Originally Posted by brad_man_72

Driveshafts can ring like a windchime at audible frequencies if they don't have insulation inside them. Many " driveshaft builders" don't stuff their shafts. To check your shaft you can wrap 5-10 layers of duct tape in the center of your shaft to see if the noise changes or goes away completely.

Originally Posted by Keith Seymore

Good thought, Brad -

K

Originally Posted by brad_man_72

I try

I figure between me and you we could figure out just about any driveline issue around here.


Any news?

You two bring a lot of credibility to this site, and your opinions carry a lot of weight with me. All of us are lucky to have you guys around.

[Keith Seymore]

Originally Posted by slikside

You two bring a lot of credibility to this site, and your opinions carry a lot of weight with me. All of us are lucky to have you guys around.

Thank you; it's hard to know how much to share and your comments help me (...us...) get that dialed in.

K

[Motoxrrar]

I went with a one peice drive shaft. I went through 3 carrier bearings in a few years because of the vibrations so one peice eliminated that.

[brad_man_72]

A

Originally Posted by Motoxrrar

I went with a one peice drive shaft. I went through 3 carrier bearings in a few years because of the vibrations so one peice eliminated that.

That's what happens when you don't ballance any driveshaft after changing things, they vibrate. If your one piece shaft wasn't ballanced it would tear up stuff also.

" You two bring a lot of credibility to this site, and your opinions carry a lot of weight with me. All of us are lucky to have you guys around."

Thank you slikslide, its nice to know my efforts are appreciated.

[Andy4639]

I'm headed out to the garage and wrap it a few times with tape and see how it does going to the beach. Just in the middle of the shaft right.
Thanks I will report once I drive it again. I have been cleaning it up good for the show so I haven't driven it since last saturday. It's been raining.

[brad_man_72]

Originally Posted by Andy4639

I'm headed out to the garage and wrap it a few times with tape and see how it does going to the beach. Just in the middle of the shaft right.
Thanks I will report once I drive it again. I have been cleaning it up good for the show so I haven't driven it since last saturday. It's been raining.

Yeah, the middle would be the single most effective place. Make sure to get the tape thick.

[Andy4639]

Well I thught I was going out to the garage. Wife wanted me to help move furniture in the spare bedroom for painting tomorrow. I do it tomorrow night when I get home.

[brad_man_72]

^science!

They shouldn't charge you anything to stuff the shaft. If you tap on a shaft it will ring a little even if it is stuffed. Take it for a drive before you jump to too many conclusions.

D*&n you kieth! You know how many times those big a#% dampners smashed my fingers!

Some factory shafts have a short inner steel tube isolated by rubber as a dampner/suffing... those won't smash your fingers KIETH!

[Andy4639]

Man you all need to ease up. All I did was ask a question about filling the the thing up. It wasn't like I meant I was going to do it right then. I was just noting what i found.
I just drove the truck 289 miles to Myrtle beach. The tape made it a lot better but it's still there but not near as loud as it was before. At 60-70 it barely noticeable but over 75 and it starts being a pain again.