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#26 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Ok just crawled under it and put several wraps around the center of the shaft. I tapped the housing with my finger and it sounds like a tuning folk. It rings like it's hollow! Is there anyway to put insulation in it other than cutting it open and inserting it. I figure not but thought I would ask.
I guess I need to call them and see what they would charge me to fill it.Can I drill a hole in it and put that wall foam stuff in it? ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#27 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: 2 piece drive shaft to 1
Quote:
For any noise issue you have to have three things: an input (aka "the hammer"), a responder ("the bell") and a noise transmission path (either airborne or structure borne). Take away any one of those elements and you no longer have a noise issue. So - if nothing is hammering on the shaft - then it will not respond and there is no ringing. I'd drive it and see if it's an issue before going too far down the path of filling it with foam. SIDEBAR: Just for fun - More science: if it is rear axle mesh frequency that you are hearing (aka "axle whine") then filling the shaft will not help. Axle whine is manifested by exciting the shaft torsionally (ie, it is oscillating like a rubber band, back and forth, while rotating at speed) so you need to kill the shaft by adding a torsional damper. Using the above "bell" analogy: Input: "non conjugate" meshing action between the rear axle ring gear and pinion gear Responder: the drive shaft responds torsionally in accordance with the number of teeth on the pinion gear. Said differently, for a 3.73 rear axle (41 teeth divided by 11 teeth) you can measure a frequency spike coincident with 11th order of propshaft rotation (11 "kicks" per rotation of the shaft). You can kill this response in two ways: a) Fix the axle mesh b) Add a torsional damper (like a harmonic balancer) to the shaft. Typically the front u joint is a more suitable location since the shaft amplitude is larger farther away from the input. You may have noticed some of these on C/K trucks as well as M/L vans (because I put them there). Transmission path: typically is structurally. You can make the noise go away in a Suburban or Van by disconnecting the rear suspension from the body/frame. That may not be a viable option in real life. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 03-19-2014 at 02:35 PM. |
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#28 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: 2 piece drive shaft to 1
...
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#29 |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: 2 piece drive shaft to 1
Well, Andy, I was going to volunteer to listen to your noise (read take ride in your sweet truck), but it seems you are leaving for to the beach just as I get to Greenville this weekend. My loss. Hope you find your noise.
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
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#30 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: 2 piece drive shaft to 1
^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!
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#31 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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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. ![]() ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#32 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#33 |
Registered User
Join Date: Feb 2014
Location: Tennessee
Posts: 282
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Re: 2 piece drive shaft to 1
Did you wrap the tape at the trans end or the diff end? I would go to Home Depot and buy some tar tape ( sound deadening tape ) wrap just one turn and then Some duct tape to hold it in place at the trans end. It would help a lot better.
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#34 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: 2 piece drive shaft to 1
If the tape changed it, the shaft needs to at least be checked by the builder. They should fix it for free.
Id call and bait them by asking what they use to stuff their shafts, when the say they don't stuff the shafts you can tell them that you know why your shaft is ringing. Sorry, we didn't meant to get all worked up. Some people are crazy enough to try "great stuff" in their shaft, ruining the ballance and voiding any type of warranty your driveshaft might have.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#35 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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This drive shaft is under warrinty so no I'm not going to do anything until I talk with them. Well I headed out to the car show so it will be late this afternoon before I'm back. A little video of the ride down. ![]() ![]() http://www.youtube.com/watch?v=2MZpBt70JVc
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 03-20-2014 at 07:09 AM. |
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#36 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: 2 piece drive shaft to 1
Quote:
I think some of the shafts had a cardboard liner as well. There's a lot going on there, for it just being a piece 'a pipe with some yokes on the end, eh? ![]() K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#37 | |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
|
Re: 2 piece drive shaft to 1
Quote:
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#38 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Ok thanks I know what I have to do now. When I get back to town I need to call them and setup a time to carry it over. Thanks.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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