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U-joints that vibrate? #1714366 12/22/14 10:27 PM 12/22/14 10:27 PM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	I have a new rear u-joint in a 74 B-body that may be the cause of a new vibration. The frequency of the vibration tells me it's comming from the drive shaft. I swapped in a known-to-be-good hogs head at the same time I replaced the u-joint. This was after the yoke broke. A Mopar friend said to use only Dana-Spicer u-joints to avoid the occasional bad u-joint that other manufacturers seem to produce. The suspect u-joint is a Precision 347(made in USA). How common are out of the box defects?

Re: U-joints that vibrate? [Re: 74RALLYE] #1714367 12/22/14 10:37 PM 12/22/14 10:37 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Any possibility when the yoke broke it tweaked the shaft? I'd pull it & move the front yoke thru both planes of travel and the rear one thru it's plane of travel & all should be smooth. Other than that I'd have the shaft checked/balanced but first share what happened with the yoke failure live every 24 hour block of time like it's your last day on earth

Re: U-joints that vibrate? [Re: RapidRobert] #1714368 12/22/14 11:45 PM 12/22/14 11:45 PM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	I swapped in a 4sp and rebuilt the 440. The 1st test drive didn't go well. I had my Edelbrock 800, complete with it's off idle dead spot, forcing me to rev it to take off. I hope it's not the drive shaft. The breakage occurred at low speed with high torque.

Re: U-joints that vibrate? [Re: 74RALLYE] #1714369 12/23/14 12:00 AM 12/23/14 12:00 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	All 4 "C" clips in place on each joint?

Re: U-joints that vibrate? [Re: 74RALLYE] #1714370 12/23/14 12:45 AM 12/23/14 12:45 AM
Joined: Aug 2005 Posts: 6,003 Salem Grizzly Moparts Proctologist
Grizzly Moparts Proctologist Joined: Aug 2005 Posts: 6,003 Salem	Quote: ............. A Mopar friend said to use only Dana-Spicer u-joints to avoid the occasional bad u-joint that other manufacturers seem to produce. The suspect u-joint is a Precision 347(made in USA). How common are out of the box defects? Your Friend is right. It took me a while to figure it out, but I will never run jobber greasables again. Nothing but problems no matter how often you grease them. All Spicer from now on. Mo' Farts Moderated by "tbagger".

Re: U-joints that vibrate? [Re: buildanother] #1714371 12/23/14 01:18 AM 12/23/14 01:18 AM
Joined: Feb 2014 Posts: 181 Spokane Washington P pro-streeter member
pro-streeter member P Joined: Feb 2014 Posts: 181 Spokane Washington	I had a vibration too. Traced it to the pinion angle. After correcting the angle the vibration was gone. After swapping in the 4 speed you should check the pinion angle at the differential. The Mopar performance spec is 5 to 10 degrees nose down at the differential with manual transmission. I set my Road Runner 4 speed car at 5 degrees nose down. IMO 5 degrees is plenty for street use and the occasional trip to the track. The recommended drive shaft runout should not exceed .015" this measurement should be checked at both ends and the center. This can be done with a dial indicator and magnetic base. The balance should be .3 in oz at both ends of the drive shaft.

Re: U-joints that vibrate? [Re: pro-streeter] #1714372 12/23/14 02:14 AM 12/23/14 02:14 AM
Joined: Jun 2005 Posts: 6,257 gulfport, ms, west mi rowin4 master
rowin4 master Joined: Jun 2005 Posts: 6,257 gulfport, ms, west mi	You say you broke the yoke? Do you mean the straps on the yoke ? I have never in close to 50 years of racing seen anyone "BREAK" a yoke. I have seen strap bolts break and of course spit out the u-joint. When this happens sometimes the yoke will spread causing the joint to not properly seat in the yoke causing the drive shaft to vibrate. What's the total story. Did you replace the yoke? or just the straps? it's ok to butt heads, just don't do it with a butthead

Re: U-joints that vibrate? [Re: rowin4] #1714373 12/23/14 02:35 AM 12/23/14 02:35 AM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	All C clips are in place. I rotated the drive shaft 180 degrees last weekend and it got a little worse. It sheered the whole ear off. I swapped the chunk w/yoke out and replaced the straps. 8371086-IMG_s2685.jpg (109 downloads)

Re: U-joints that vibrate? [Re: 74RALLYE] #1714374 12/23/14 02:46 AM 12/23/14 02:46 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: It sheered the whole ear off. replace the shaft (or have a shop check straightness & see if it can be taken care of) live every 24 hour block of time like it's your last day on earth

Re: U-joints that vibrate? [Re: rowin4] #1714375 12/23/14 04:35 AM 12/23/14 04:35 AM
Joined: Jun 2013 Posts: 870 Keizer, Oregon U.S.A. E elmor353 super stock
elmor353 super stock E Joined: Jun 2013 Posts: 870 Keizer, Oregon U.S.A.	In 1973 I had a 63 300 with a 413/auto and broke the rear yoke in half while power braking in my buddy's driveway.

Re: U-joints that vibrate? [Re: Grizzly] #1714376 12/23/14 10:43 AM 12/23/14 10:43 AM
Joined: Feb 2003 Posts: 12,675 Columbia, CT M moper I Live Here
moper I Live Here M Joined: Feb 2003 Posts: 12,675 Columbia, CT	Quote: [ Your Friend is right. It took me a while to figure it out, but I will never run jobber greasables again. Nothing but problems no matter how often you grease them. All Spicer from now on. x2. The tolerances stack up and even brand new joints will have too much slop once installed. It's slop between the joint's trunion and the needles/caps. Usually enough to see it if you have a good light under there. Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.

Re: U-joints that vibrate? [Re: moper] #1714377 12/23/14 12:04 PM 12/23/14 12:04 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	make sure the caps are not spinning in the yoke. and the yokes are not spred/worn out

Re: U-joints that vibrate? [Re: rowin4] #1714378 12/23/14 02:34 PM 12/23/14 02:34 PM
Joined: Sep 2014 Posts: 1,408 Central Pa M moparjim79 pro stock
moparjim79 pro stock M Joined: Sep 2014 Posts: 1,408 Central Pa	Broke the pinion yoke on my 72 charger. 318 4 bbl w 3.91s. Downshifted to first doing 30 at full throttle. It was gnarly.

Re: U-joints that vibrate? [Re: rowin4] #1714379 12/23/14 08:22 PM 12/23/14 08:22 PM
Joined: Jan 2003 Posts: 10,585 Freeport IL USA poorboy I Live Here
poorboy I Live Here Joined: Jan 2003 Posts: 10,585 Freeport IL USA	Quote: You say you broke the yoke? Do you mean the straps on the yoke ? I have never in close to 50 years of racing seen anyone "BREAK" a yoke. I have seen strap bolts break and of course spit out the u-joint. When this happens sometimes the yoke will spread causing the joint to not properly seat in the yoke causing the drive shaft to vibrate. What's the total story. Did you replace the yoke? or just the straps? You obviously were not trying hard enough! I think, through the years, I've managed to break just about everything under a car. Some stuff was more difficult then other stuff, and some of it broke and it wasn't even fun. As I've gotten older, I break a lot less stuff, mainly because I'm too lazy and too cheap to keep replacing stuff. To the op, if you broke the pinion yoke, the driveshaft is in question, as is the pinion shaft in the rear axle. When you changed the yoke, you didn't mess up the ring & pinion setting, did you? Gene

Re: U-joints that vibrate? [Re: 74RALLYE] #1714380 12/23/14 10:03 PM 12/23/14 10:03 PM
Joined: Jun 2005 Posts: 6,257 gulfport, ms, west mi rowin4 master
rowin4 master Joined: Jun 2005 Posts: 6,257 gulfport, ms, west mi	Quote: All C clips are in place. I rotated the drive shaft 180 degrees last weekend and it got a little worse. It sheered the whole ear off. I swapped the chunk w/yoke out and replaced the straps. Ok, you changed out the chunk. If you swapped ends on the drive shaft and it got worse , I would think the drive shaft is bent some. it's ok to butt heads, just don't do it with a butthead

Re: U-joints that vibrate? [Re: rowin4] #1714381 12/23/14 10:33 PM 12/23/14 10:33 PM
Joined: Jul 2007 Posts: 11,836 Florida M mopar346 Let me tell ya about fat chicks!
mopar346 Let me tell ya about fat chicks! M Joined: Jul 2007 Posts: 11,836 Florida	Quote: Quote: All C clips are in place. I rotated the drive shaft 180 degrees last weekend and it got a little worse. It sheered the whole ear off. I swapped the chunk w/yoke out and replaced the straps. Ok, you changed out the chunk. If you swapped ends on the drive shaft and it got worse , I would think the drive shaft is bent some. I take it he rotated the shaft 180* in the yoke not swapped ends. Careful, your character's showing!

Re: U-joints that vibrate? [Re: 74RALLYE] #1714382 12/23/14 11:09 PM 12/23/14 11:09 PM
Joined: Feb 2009 Posts: 892 Illinois StrkrDart69 super stock
StrkrDart69 super stock Joined: Feb 2009 Posts: 892 Illinois	Hogs head?? Never heard that before.

Re: U-joints that vibrate? [Re: StrkrDart69] #1714383 12/23/14 11:53 PM 12/23/14 11:53 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	might have to check your sprag(over running clutch) in the trans to make sure it did not get damaged with the drive line failure. if the shaft came out of the yoke under power that shaft is BENT FOR SURE.

Re: U-joints that vibrate? [Re: scratchnfotraction] #1714384 12/24/14 01:37 PM 12/24/14 01:37 PM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	First I'm going to try a spicer u-joint ASAP. I hope it's not the drive shaft. I replaced it 2 years ago after another u-joint failure that happened shifting from 2nd to drive at 94mph with the automatic. That was scary. Hogs head may be the Ford word for "The chunk."

Re: U-joints that vibrate? [Re: 74RALLYE] #1714385 12/24/14 04:19 PM 12/24/14 04:19 PM
Joined: Jan 2003 Posts: 942 Virginia, US R RTDaddy super street
RTDaddy super street R Joined: Jan 2003 Posts: 942 Virginia, US	Quote: First I'm going to try a spicer u-joint ASAP. I hope it's not the drive shaft. I replaced it 2 years ago after another u-joint failure that happened shifting from 2nd to drive at 94mph with the automatic. That was scary. Hogs head may be the Ford word for "The chunk." For those of you who may not know, 74Rallye is a former Ford guy. "Forgive him, he knew not what he did." Obviously, he has returned "from the dark side." "IF YOU'RE UNDER CONTROL, YOU AIN'T GOING FAST ENOUGH."

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