U joint - The 1947 - Present Chevrolet & GMC Truck Message Board Network

paaw · 05-17-2007, 09:58 PM

how do you know when they are bad, Have some vibration between 2500 and 3000 rpm, how can u tell if it is driveshaft, u joint, or what?

thanks paaw

Sport/Truck · 05-17-2007, 10:08 PM

They will clunk when you shift into gear usually. You can also grab it with your hand and twist it and see/feel movement.
I think it sounds like it’s your tires. Have you balanced them lately?
s/t

Jim_PA · 05-17-2007, 10:14 PM

I've had them cause vibes before they got to the point of clunking or feeling loose, but the only way to tell if they aren't obviously busted is to take them apart and look.

Sport/Truck · 05-17-2007, 10:20 PM

Quote:

Originally Posted by Jim_PA

I've had them cause vibes before they got to the point of clunking or feeling loose, but the only way to tell if they aren't obviously busted is to take them apart and look.

Was it only at a specific RPM range? Just wondering.
s/t

paaw · 05-17-2007, 10:20 PM

I don't hear any clunking, will take it to get tires checked

paaw · 05-17-2007, 10:22 PM

not really just once i got over 60 it will start vibrating

Sport/Truck · 05-17-2007, 10:22 PM

If they are the same size, you can have them rotated too.
s/t

Sport/Truck · 05-17-2007, 10:24 PM

Quote:

Originally Posted by paaw

not really just once i got over 60 it will start vibrating

Does it seem to go away if you go faster than the speed that is starts to vibrate?
s/t

lbpd719 · 05-17-2007, 10:26 PM

any noise? sure it's not in your rear diff??

Mine has a hum that starts at about 45'ish and gets louder as speed increases.. new rear gears is on my list because of it..

sodak69c10 · 05-17-2007, 10:28 PM

my truck vibrates over 60mph turns out i missing a tooth off the ring gear.

a kid in my class has a mustang that had about an 1/8"(no joke) of slop in the rear u-joint it vibrated

paaw · 05-17-2007, 10:38 PM

going to take it out on the interstate tomorrow and see if it stops after a certain speed and listen to see if it is whining(humming). did not vibrate, before changed trans, also had diffferent tires put on back. Don't think the guy balanced them. went from 235-70-15 to 275-60-15

Sport/Truck · 05-17-2007, 10:45 PM

Quote:

Originally Posted by paaw

going to take it out on the interstate tomorrow and see if it stops after a certain speed and listen to see if it is whining(humming). did not vibrate, before changed trans, also had diffferent tires put on back. Don't think the guy balanced them. went from 235-70-15 to 275-60-15

Look over your drive shaft for any dents, fresh signs of abrasions that could possibly have removed a weight from you drive shaft. I doubt it's that, but look to make sure.
I still think its your tires - especially since you don’t think they balanced them.
s/t

sodak69c10 · 05-17-2007, 10:57 PM

agree

Jim_PA · 05-17-2007, 10:57 PM

Quote:

Originally Posted by Sport/Truck

Was it only at a specific RPM range? Just wondering.
s/t

The ones I just replaced would give me some vibes under a light (yet specific) load condition. Going over a certain speed would make it worse, but it was more related to load and MPH than RPM.

GREASEMONKEY72 · 05-18-2007, 04:22 AM

it could be nothing, happened to me, i thought it was something with the drive shaft but the joints and the bearing are good so i balanced the tires, still there, the gears in the diff are fine and yet it still does it a bit, my brothers 05 f250 4x4 does it, my brother inlaws 95 nissan 4x4 does it, so it could just be something you didnt notice before and now for some reason you do, just like i did

sodak69c10 · 05-18-2007, 12:27 PM

could be harmonics to if it does it at a specific speed not above or below it maybe everything is just right and magnifies a smaller vibrations?

beats me,

well, time to go back to work now

05-17-2007, 09:58 PM	#1
paaw Registered User Join Date: Feb 2006 Location: nashville Posts: 217	U joint how do you know when they are bad, Have some vibration between 2500 and 3000 rpm, how can u tell if it is driveshaft, u joint, or what? thanks paaw __________________ 1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold

05-17-2007, 10:08 PM	#2
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: U joint They will clunk when you shift into gear usually. You can also grab it with your hand and twist it and see/feel movement. I think it sounds like it’s your tires. Have you balanced them lately? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

05-17-2007, 10:14 PM	#3
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: U joint I've had them cause vibes before they got to the point of clunking or feeling loose, but the only way to tell if they aren't obviously busted is to take them apart and look.

05-17-2007, 10:20 PM	#5
paaw Registered User Join Date: Feb 2006 Location: nashville Posts: 217	Re: U joint I don't hear any clunking, will take it to get tires checked __________________ 1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold

05-17-2007, 10:22 PM	#6
paaw Registered User Join Date: Feb 2006 Location: nashville Posts: 217	Re: U joint not really just once i got over 60 it will start vibrating __________________ 1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold

05-17-2007, 10:22 PM	#7
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: U joint If they are the same size, you can have them rotated too. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

05-17-2007, 10:26 PM	#9
lbpd719 Zappaphile! Join Date: Apr 2007 Location: Los Banos, California Posts: 228	Re: U joint any noise? sure it's not in your rear diff?? Mine has a hum that starts at about 45'ish and gets louder as speed increases.. new rear gears is on my list because of it.. __________________ 1969 C20 LWB Camper Special - The Beater.. 1998 Cheyenne V6 - 4/6 Drop - For The Son Last edited by lbpd719; 05-17-2007 at 10:28 PM. Reason: forgot to mention..

05-17-2007, 10:28 PM	#10
sodak69c10 Registered User Join Date: Mar 2007 Location: Rapid City, South Dakota Posts: 285	Re: U joint my truck vibrates over 60mph turns out i missing a tooth off the ring gear. a kid in my class has a mustang that had about an 1/8"(no joke) of slop in the rear u-joint it vibrated __________________ ,Clint LOUD PIPES SAVE LIVES 69 C-10 short stepside 406 sbc, 02 YAMAHA WR250F, 07 SUZUKI SV650S, 81 Grand Prix 355 sbc, 81 XT 500 YAMAHA

05-17-2007, 10:38 PM	#11
paaw Registered User Join Date: Feb 2006 Location: nashville Posts: 217	Re: U joint going to take it out on the interstate tomorrow and see if it stops after a certain speed and listen to see if it is whining(humming). did not vibrate, before changed trans, also had diffferent tires put on back. Don't think the guy balanced them. went from 235-70-15 to 275-60-15 __________________ 1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold

05-17-2007, 10:57 PM	#13
sodak69c10 Registered User Join Date: Mar 2007 Location: Rapid City, South Dakota Posts: 285	Re: U joint agree __________________ ,Clint LOUD PIPES SAVE LIVES 69 C-10 short stepside 406 sbc, 02 YAMAHA WR250F, 07 SUZUKI SV650S, 81 Grand Prix 355 sbc, 81 XT 500 YAMAHA

05-18-2007, 04:22 AM	#15
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: U joint it could be nothing, happened to me, i thought it was something with the drive shaft but the joints and the bearing are good so i balanced the tires, still there, the gears in the diff are fine and yet it still does it a bit, my brothers 05 f250 4x4 does it, my brother inlaws 95 nissan 4x4 does it, so it could just be something you didnt notice before and now for some reason you do, just like i did __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

05-18-2007, 12:27 PM	#16
sodak69c10 Registered User Join Date: Mar 2007 Location: Rapid City, South Dakota Posts: 285	Re: U joint could be harmonics to if it does it at a specific speed not above or below it maybe everything is just right and magnifies a smaller vibrations? beats me, well, time to go back to work now __________________ ,Clint LOUD PIPES SAVE LIVES 69 C-10 short stepside 406 sbc, 02 YAMAHA WR250F, 07 SUZUKI SV650S, 81 Grand Prix 355 sbc, 81 XT 500 YAMAHA



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