Bad driveline vibration after manual trans UPDATED
#906634
01/16/11 06:23 PM
01/16/11 06:23 PM
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Joined: Feb 2003
Posts: 4,503 NJ
440challenger
OP
master
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OP
master
Joined: Feb 2003
Posts: 4,503
NJ
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I swaped out the auto trans in my roadrunner for a a833 4 speed setup. I used the same driveshaft from the auto and the correct year manual trans cross member. I now have a very bad vibration at anything 60mph or over. If i press the clutch in when it vibrates no change.
I did notice that my drive shaft is pushed into the tail housing almost all the way to the yoke. Could this be the problem?
Last edited by 440challenger; 03/14/11 09:28 AM.
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906635
01/16/11 06:53 PM
01/16/11 06:53 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
top fuel
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top fuel
Joined: Jan 2007
Posts: 2,212
Minnesota
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Vibration problems like that can drive you crazy. I'm not aware that the driveshaft length is different between manual and automatic transmission. Since it doesn't change when you depress the clutch it's probably a safe bet the problem is alignment or support.
Two thoughts: 1) double check that you got the u joint caps seated properly on the 3rd member yoke. 2) You didn't mention the condition of the 4 speed. I'd be concerned about the brass bushing inside the tail stock of the 4 speed which the slip yoke goes into. I've had high speed vibration issues because of those being worn, but often the vibration will over power the rear seal and you'll have fluid leaking out the back of the tranny.
Hope this helps.
Lead, follow or get the hell out of the way
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Re: Bad driveline vibration after manual trans install
[Re: DAYCLONA]
#906638
01/16/11 08:24 PM
01/16/11 08:24 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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remove the yoke from drive shaft slid it in the tranz till it bottom out measure from cent of cup to center of cups on the rear diff subtrac 1" to get correct length check pinion angles also make sure u-joints move freely in the yokes make sure they are greesed up good
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Re: Bad driveline vibration after manual trans install
[Re: Pacnorthcuda]
#906640
01/16/11 08:53 PM
01/16/11 08:53 PM
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Joined: Feb 2003
Posts: 4,503 NJ
440challenger
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OP
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Posts: 4,503
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Quote:
You did check the bellhousing alignment to the block right?
No i did not. This is like a serious vibration. It feels and sounds exactly like when a joint fails while driving and it bangs around
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906641
01/16/11 09:12 PM
01/16/11 09:12 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Same yoke/shaft/ujoints right? That only leaves angle/butted/bushing/mount EDIT I'd get the rear up w a stout hyd floor jack (stands would be safer) and have a helper run it in gear & you (carefully) see what you see
Last edited by RapidRobert; 01/16/11 09:17 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Bad driveline vibration after manual trans install
[Re: Chi_Town_Runner]
#906644
01/16/11 09:52 PM
01/16/11 09:52 PM
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Joined: Feb 2003
Posts: 4,503 NJ
440challenger
OP
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OP
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Quote:
Just a WAG
Did you change/replace the bushing in the crank?
Frank
Yes i replaced the bushing.
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906646
01/16/11 10:06 PM
01/16/11 10:06 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I think the prob is right there at the tail end of the trans at the yoke
live every 24 hour block of time like it's your last day on earth
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906647
01/17/11 12:00 AM
01/17/11 12:00 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I would ditch the balance ring on the shaft get you a long shaft and have it cut down and balanced for a perfect fit..its allways cheaper to shortin it cheap u-joints can wear fast with bad drive line angles/balance
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906649
01/18/11 06:24 PM
01/18/11 06:24 PM
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Joined: Mar 2006
Posts: 9,841 MI, usa
dvw
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master
Joined: Mar 2006
Posts: 9,841
MI, usa
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For what it's worth my Challenger has the same type of vibration. Bell housing is with-in .005" in both planes. U-Joint angle is 1.5 degrees at both ends of the drive shaft (one angle positive,one angle negative),new Dyno-tech shaft with less than .030" runout, 2 different sets of axle shafts. I've had 3 center sections in it,2.76,3.55,4.30. No vibration with the 2.76. Both the 3.55 and the 4.30 have been in my other car with no problems. I rebuilt the trans, no noise, shifts great. However back in the day I broke 3 drive shafts. One broke a bell housing, one broke the front driveshaft yoke. I'm wondering now if the input or output shaft/shafts are bent. I wouldn't have thought it posible,but. This summer my friends 66 Coronet lost a u-joint cap on the X-way at 55 MPH with 4.10 gears. It bent the output shaft at about a 20 degree angle. Though it was an automatic the shafts are similar in diameter. I haven't got around to checking it yet. Doug
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906650
01/18/11 06:33 PM
01/18/11 06:33 PM
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Joined: Jan 2003
Posts: 4,285 Ohio
64dodge572
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Ohio
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Quote:
I swaped out the auto trans in my roadrunner for a a833 4 speed setup. I used the same driveshaft from the auto and the correct year manual trans cross member. I now have a very bad vibration at anything 60mph or over. If i press the clutch in when it vibrates no change.
I did notice that my drive shaft is pushed into the tail housing almost all the way to the yoke. Could this be the problem?
Is the vibration MPH related or RPM? I didn't see you mention what engine you have, Is the flywheel the correct balance for the engine?
Brewers Performance Inc. 4-speed transmission and parts specialists PH 937-947-4416 or 937-698-4259 FAX 937-947-4419 www.brewersperformance.com
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Re: Bad driveline vibration after manual trans install
[Re: 440challenger]
#906652
02/06/11 08:44 PM
02/06/11 08:44 PM
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Joined: Feb 2003
Posts: 4,503 NJ
440challenger
OP
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OP
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So i checked it out today. Took it for a ride and and here is what it does. It is deffiently MPH related.In fouth gear at anything over 3k rpm is vibrates like MAD. Its smooth as silk UNTIL that speed(probably around 60mph). The vibration resonates thought the driveline and will not go away until the car starts to slow down. If I pop it in neutral it has 0 effect.
I tried checking my pinion angle,not really sure where to exactly measure but i ended up putting my angle finder on the drive shaft and got -3 and then i put it on the pad where the pinion snubber is and got +3. Not sure if thats good? I ended up flipping the drive shaft 180 degrees in the yoke that did nouthing. SO then i figured let me try and put some shims under the trans mount to move the tailshaft up, Put about 3 fender shims under the mount and took the car out, made NO difference.
Im really not sure where to go from here. This car was so smooth with the automatic right before i converted to the manual. When i converted to the manual i used the correct 68 crossmember and mount, the SAME driveshaft that I had with the auto. I used all correct Mopar fastners for the flywheel and pressure plate. A reconditioned flywheel from Brewers and a new DF Centerforce clutch , all new linkage etc.
Pilot bushing is new also. I did not do any alignment with the bellhousing, i just bolted it on using the factory dowels.
This is a CRAZY vibration,like when it starts to vibrate, you have to back RIGHT off the throttle. makes about the same racket as if you were in a car and it spit a ujoint.
Any suggestions Please help. Im not sure what to do next?
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