Expert help U joints =\

tehdwarvenn · May 6th, 2008, 08:19 PM

hey guys i need someone to tell me how to align u joints with the slip yoke. when my mechanic changed my ujoints (had vibrations above 60), i think he pulled the slip yoke out when he dropped the shaft (which is a big no no unless you know which teeth line up -_-) ANYWAYS...

is there any way i can get this realigned? and just as a personal opinion, he should fix this for free. but that wont be able to be done till another few days, so i was seeing if there is anything i could do.

this MIGHT not be the problem either, need some more insight from the people who know what they are talking about please.

the vibrations occur at anything above 40, and at 60, the vibrations are hard enough to make you hover over your seat.

Drick · May 6th, 2008, 08:21 PM

That must be way the hell out of line if its that bad. Are you saying he didnt put the yoke in the tail shaft right well that just slides in so that cant really be it.

Bent driveshaft

tehdwarvenn · May 6th, 2008, 08:24 PM

yea is freakin terrible. i ALMOST dont want to drive it even after not having it for 2 weeks. and thats sad. cute avatar 86gt, ur cat has awesome eyes >.<

Drick · May 6th, 2008, 09:10 PM

thanks

trueblue01 · May 7th, 2008, 08:34 AM

Bent shaft or out of balance.

White 89 · May 7th, 2008, 09:34 AM

My U-joints were bad. I had the violent vibrations. We replaced both U-joints and vibrations went away.

Did he replace yours?

trueblue01 · May 7th, 2008, 10:29 AM

Originally Posted by tehdwarvenn

hey guys i need someone to tell me how to align u joints with the slip yoke. when my mechanic changed my ujoints (had vibrations above 60), i think he pulled the slip yoke out when he dropped the shaft (which is a big no no unless you know which teeth line up -_-) ANYWAYS...

Says he did. How good is your mechanic?

saldoggs · May 7th, 2008, 01:15 PM

just a question how much did you pay for the new u joints to be installed usually it only a few $ more for a new FRPP drive shaft shipped from summit also is sounds like he did not bolt the drive shaft to the rear in the original holes there are eight holes he might have used the wrong set of holes also if he did not tighten the bolts the drive shaft will loosen up and vibrate like crazy

ryans88gt · May 7th, 2008, 01:21 PM

Since your yoke is now in a different orientation to the shaft, you may need to have the shaft rebalanced. That is about all you can do. you might want to make sure he tightened all the driveshaft bolts completely.

nolife · May 7th, 2008, 01:47 PM

Originally Posted by ryans88gt

Since your yoke is now in a different orientation to the shaft, you may need to have the shaft rebalanced. That is about all you can do. you might want to make sure he tightened all the driveshaft bolts completely.

Really? Are the yoke and drive shaft balanced as a set or individually. I would think if they both are balanced, both should remain balanced when attached together. Over time, do they form or degrade into a balance that only works as a "pair".

Maybe I missed this or I am confused but would it matter from a balancing standpoint, the exact tooth alignment on how the yoke was placed into the transmission? If so, that would make buying a new or used yoke a real PITA as you would have no reference.

tehdwarvenn · May 7th, 2008, 02:40 PM

well all he did was replace the ujoints, so i have no idea what could have gone wrong now. im taking it to him today.

ryans88gt · May 7th, 2008, 03:04 PM

Well it isn't usually a problem, but if you are noticing a vibration difference, then it can be that it was put back in 180 degrees different than it was. The same holds true for where the driveshaft bolts up to the pinion. Sometimes in one orientation it will vibrate, but if you rotate 90 degrees and bolt it back up it will be smooth. Drive line vibrations are no fun and it is almost impossible to get rid of all of them in a car that is 20 years old.

May 6th, 2008, 08:19 PM	#1
tehdwarvenn Regular Join Date: May 2007 Location: Columbia SC Posts: 301 iTrader: 0 reviews	Expert help U joints =\ hey guys i need someone to tell me how to align u joints with the slip yoke. when my mechanic changed my ujoints (had vibrations above 60), i think he pulled the slip yoke out when he dropped the shaft (which is a big no no unless you know which teeth line up -_-) ANYWAYS... is there any way i can get this realigned? and just as a personal opinion, he should fix this for free. but that wont be able to be done till another few days, so i was seeing if there is anything i could do. this MIGHT not be the problem either, need some more insight from the people who know what they are talking about please. the vibrations occur at anything above 40, and at 60, the vibrations are hard enough to make you hover over your seat. __________________ 1993 Mustang GT, catless h-pipe, bbk shorties, 40 series flows, bbk rear suspension, edelbrock front suspension, AUTOLITES!!! =), k&n, underdrives, 3.73's

May 6th, 2008, 08:21 PM	#2
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,336 iTrader: 1 reviews	That must be way the hell out of line if its that bad. Are you saying he didnt put the yoke in the tail shaft right well that just slides in so that cant really be it. Bent driveshaft __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

May 6th, 2008, 08:24 PM	#3
tehdwarvenn Regular Join Date: May 2007 Location: Columbia SC Posts: 301 iTrader: 0 reviews	yea is freakin terrible. i ALMOST dont want to drive it even after not having it for 2 weeks. and thats sad. cute avatar 86gt, ur cat has awesome eyes >.< __________________ 1993 Mustang GT, catless h-pipe, bbk shorties, 40 series flows, bbk rear suspension, edelbrock front suspension, AUTOLITES!!! =), k&n, underdrives, 3.73's

May 6th, 2008, 09:10 PM	#4
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,336 iTrader: 1 reviews	thanks __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

May 7th, 2008, 08:34 AM	#5
trueblue01 Enthusiast 1989 Mustang LX 10.98@126.7 NA Join Date: Feb 2008 Location: N.E. Ohio Posts: 698 iTrader: 0 reviews	Bent shaft or out of balance. __________________ Never fast enough.

May 7th, 2008, 09:34 AM	#6
White 89 Enthusiast Join Date: Oct 2007 Posts: 825 iTrader: 0 reviews	My U-joints were bad. I had the violent vibrations. We replaced both U-joints and vibrations went away. Did he replace yours? __________________ 1989 mustang GT 5.0

May 7th, 2008, 01:15 PM	#8
saldoggs Regular 1993 mustang lx convertib Join Date: Jan 2008 Location: staten island nyc Posts: 146 iTrader: 0 reviews	just a question how much did you pay for the new u joints to be installed usually it only a few $ more for a new FRPP drive shaft shipped from summit also is sounds like he did not bolt the drive shaft to the rear in the original holes there are eight holes he might have used the wrong set of holes also if he did not tighten the bolts the drive shaft will loosen up and vibrate like crazy

May 7th, 2008, 01:21 PM	#9
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Since your yoke is now in a different orientation to the shaft, you may need to have the shaft rebalanced. That is about all you can do. you might want to make sure he tightened all the driveshaft bolts completely. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

May 7th, 2008, 02:40 PM	#11
tehdwarvenn Regular Join Date: May 2007 Location: Columbia SC Posts: 301 iTrader: 0 reviews	well all he did was replace the ujoints, so i have no idea what could have gone wrong now. im taking it to him today. __________________ 1993 Mustang GT, catless h-pipe, bbk shorties, 40 series flows, bbk rear suspension, edelbrock front suspension, AUTOLITES!!! =), k&n, underdrives, 3.73's

May 7th, 2008, 03:04 PM	#12
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Well it isn't usually a problem, but if you are noticing a vibration difference, then it can be that it was put back in 180 degrees different than it was. The same holds true for where the driveshaft bolts up to the pinion. Sometimes in one orientation it will vibrate, but if you rotate 90 degrees and bolt it back up it will be smooth. Drive line vibrations are no fun and it is almost impossible to get rid of all of them in a car that is 20 years old. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

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