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Author
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Topic: Vibration in driveline - Help!!!
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ukracer
Gearhead Posts: 166
From: South Wales UK
Registered: Apr 2003
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posted 07-13-2004 11:57 AM
   
My 69 Mustang has a nasty vibration in top gear(toploader)from 3000 rpm upwards and by 5000 it's pretty bad. It's definitely in the driveline as it vibrates when the car is stopped and rear wheels are off the ground.
So far have tried:
1) Running with no wheels
2) Running no wheels and no drums
3) running no wheels, no drums, no axle shafts.
4) All of the above with a fresh rebalanced driveshaft (plus one new UJ).
Run out of ideas now, anyone think of anything else?
Cheers, Martin
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capri man
Gearhead Posts: 7249
From: doerun, ga.
Registered: Nov 2000
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posted 07-13-2004 12:04 PM
trans. tailshaft bearing/bushing??------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
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ukracer
Gearhead Posts: 166
From: South Wales UK
Registered: Apr 2003
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posted 07-13-2004 12:13 PM
Tailhousing bushing was replaced recently. Also, both rear axle bearings are new.
Cheers, Martin
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blackford
Journeyman Posts: 45
From: Corona, Ca
Registered: Jan 2004
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posted 07-13-2004 01:03 PM
Assuming it does NOT happen in the lower gears and only happens in top gear, its either a internal toploader issue, driveshaft issue, or rear end issue. If you leave it in 3rd and take the rpms up to within the mph where the problem occurs and the problem is gone...toploader. If its still there...toploader, driveshaft or rear end. ------------------
'65 "Black" ford FB, 331 with H beam 289 rods, KB322s, fully prepped 351w heads, 282S cam, C-4, 3.5 9" posi. Many Suspension and steering mods. 4.5 year restomod project completed in May '04. 297 RWHP and 307 RWTQ with mufflers, no tuning and timing off by 4 degrees retarded.
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ukracer
Gearhead Posts: 166
From: South Wales UK
Registered: Apr 2003
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posted 07-13-2004 01:35 PM
Ah! Mr Blackford. I have seen you over on FM (I am not a member) and admire your '65 very much. Pity about the 'racing seat', it looked good.
The vibration seems to be speed related but your toploader comments bear thinking about. I may try running with no driveshaft in the morning to rule out the toploader. I also have another driveshaft (borrowed) to try. It's disconcerting to get the car up to 5000/5500 rpm in 4th (3.25 rear) and have it shaking badly. I need to fix this before the next race.
Cheers, Martin
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coupe3w
Journeyman Posts: 83
From:
Registered: Mar 2004
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posted 07-13-2004 02:17 PM
I take it that it doesn't do it in neutral, so it's not clutch or engine related. I was chasing my vibration for years and I replaced the driveshaft and tailshaft bushing along with the pinion angle. Finally have it so I can drive it. Still have some vibration which could be in the T-5 or the rear gear back lash. Still working on it. Good luck with your's and let us know what you find.Coupe3w [This message has been edited by coupe3w (edited 07-13-2004).]
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Buster
Gearhead Posts: 1553
From: Hurricane alley
Registered: May 2002
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posted 07-13-2004 09:18 PM
Don't forget to take all the belts off and test it that way as well when it's up in the air.... I've found belts can cause a vibration as well.
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 07-13-2004 09:35 PM
Martin,I'd pull the center-section and see if you've got a missing tooth or two. SteveW
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ukracer
Gearhead Posts: 166
From: South Wales UK
Registered: Apr 2003
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posted 07-14-2004 11:38 AM
First to reply to above posts - teeth are good in the rear - recently rebuilt the TracLock so all was checked and good. Also vibration does not occur in neutral or lower gears as driveshaft not turning fast enough.Ok, little update after today's efforts.Tried running with no driveshaft - no vibration (well, just a little but OK) Tried the borrowed driveshaft - seemed much better than with my own DS. Had a good look at it and found the UJ caps are 1 1/16" on mine and 1 1/8" on the borrowed DS. Dug out some spare caps (right size) and it seems much better now and probably about as good as it can get. So, thanks for the replies guys and keep an eye on the UJ sizes when changing them. My excuse is this DS was with the car when I got it. HTH
Cheers, Martin. [This message has been edited by ukracer (edited 07-14-2004).]
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Big D
Gearhead Posts: 5480
From: WELLS, NEVADA USA
Registered: Nov 2000
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posted 07-16-2004 02:07 PM
My 6T6 always had a vibration at highway speeds and nothing seemed to cure it.. Then a partner of mine asked if the driveline was align perfectly straight with the differential?? When I told him it looked pretty straight to me,, he suggested to add a couple of wedges under the leaf spring perches,, putting a an angle (2-3 degrees down) at the 3rd Member/Drive Line..Tried it and the vibration went away.. When you accilerate,, torque will make it straighten back up,, but when cruising it always has a small angle.. Summit sells the wedges.. ------------------
Don
6T6 Fastback
[color=red]331 STROKER[/color=red],, WC T-5
Royal Blue Metallic w/Ghost Flames
http://mustangsandmore.50megs.com/MembersPics/BigD.html
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ukracer
Gearhead Posts: 166
From: South Wales UK
Registered: Apr 2003
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posted 07-16-2004 02:27 PM
Thanks for that Don, this is about the only thing left for me to check and I haven't done it yet because I can't find an angle finder anywhere! I will keep trying and as sson as I find one, it will be checked and adjusted as necessary. FWIW, it does *look* like it's right!
Cheers, Martin
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