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Author
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Topic: 9" vibration
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coupe3w
Journeyman Posts: 66
From:
Registered: Mar 2004
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posted 06-23-2004 03:32 PM
   
Anyone ever have a vibration from a 9" rear?
Can the carrier cause this? Is it common?
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capri man
Gearhead Posts: 6652
From: doerun, ga.
Registered: Nov 2000
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posted 06-23-2004 03:48 PM
boy, i can see this one going downhill in a hurry!!!  ------------------
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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Mooney
Gearhead Posts: 1691
From: Marietta, Ga
Registered: Oct 2003
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posted 06-23-2004 03:56 PM
I think you might need to be a bit more specific on your question; does it do it all the time, does it seem more signifigant at any point and time, when did it start... anything happen before it started.. what does it sound like etc. Anything you can think of, that might aid the guys here would be greatly appreciated I'm sure and will speed up your response time.
Luke
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capri man
Gearhead Posts: 6652
From: doerun, ga.
Registered: Nov 2000
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posted 06-23-2004 04:18 PM
dang, sometimes it is hard to be good!!!!
sorry coupe3w.------------------
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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Mooney
Gearhead Posts: 1691
From: Marietta, Ga
Registered: Oct 2003
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posted 06-23-2004 04:51 PM
quote:
Originally posted by capri man:
dang, sometimes it is hard to be good!!!!
sorry coupe3w.
Ain't that the truth! But someones gotta do it
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65ponycar
Gearhead Posts: 805
From: Dayton, OH
Registered: Jul 2003
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posted 06-23-2004 08:06 PM
Do you have the correct u-joints? Any play anywhere in driveshaft or surrounding areas? What speed do you get the vibration at?
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XR7
Gearhead Posts: 135
From: north Idaho
Registered: Mar 2003
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posted 06-23-2004 08:07 PM
Mine had a bad vibration! This was the cause
http://www.network54.com/Forum/message?forumid=74182&messageid=1087355558------------------
68 Cougar XR7, 428 4-speed, Best ET 6.82 @ 101 1/8, 10.69@ 127.44 with 1.51 60 ft. Street legal all steel car w/ full interior.
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coupe3w
Journeyman Posts: 66
From:
Registered: Mar 2004
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posted 06-24-2004 07:02 AM
Looking back at the post I guess it was funny, but I didn't mean it to be.
I put the car up on stands last night and ran it thru the gears. It is fine in 1st, 2nd, 3rd, and 4th, but in 5th (T-5) it vibrates at around 2500 RPM. I have 4:30 gears. With no load the vibration isn't as bad as when driving it. Also on the road it vibrates in all gears.
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65ponycar
Gearhead Posts: 805
From: Dayton, OH
Registered: Jul 2003
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posted 06-24-2004 08:36 PM
Try removing the wheels/tires and drums from the rear the next time you have it in the air. See what this does for your vibration....Object of the game is to eliminate possible causes. -Dan ------------------
'65 Coupe I6
5 Lug Front/8" rear(3.55) & V8 suspension conversion
TCP subframes
Soon to be, T-5 swap---or 302 now?!?!
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Bloose
Gearhead Posts: 692
From: Milwaukee, WI
Registered: Dec 2001
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posted 06-24-2004 10:50 PM
Sounds like ujoint angles to me. With no load the pinion does not wrap so the angle problem is lessend. Pinion should be up a few degree's less than the trans is down. You start to hear and feel the vibes when it hits the harmonic HZ, which is why you don't have a problem in the lower gears.B-loose
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n2oMike
Gearhead Posts: 2499
From: Spencer, WV
Registered: Jan 2001
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posted 06-24-2004 11:58 PM
quote:
Originally posted by capri man:
dang, sometimes it is hard to be good!!!!
sorry coupe3w.
And sometimes it's good to be hard! Heat treat, of course. You don't want your gears to wear out prematurely... Yea, save the softer pro gears for the guys doing the hardcore drag thing.  Vibrations generally come from the driveshaft, but can come from the rearend if something is really worn out. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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coupe3w
Journeyman Posts: 66
From:
Registered: Mar 2004
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posted 06-25-2004 06:40 AM
Bloose, I just adjusted my pinion angle trying to get rid of the vibration. I now have 4 degrees down at the trans, 4 degrees up at the pinion and the driveshaft is at 2 degrees. Does this sound correct?
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matt d
Journeyman Posts: 58
From: Coventry, CT USA
Registered: Mar 2003
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posted 06-25-2004 12:45 PM
A simple thing that was also referred to above....I had a vibration that I was sure was caused by my new 9" rear, since my wheels had just been balanced. It would show up at high speed.I took the same wheels to a better shop for re-balance and the problem disappeared. ------------------
66 coupe with: 351W, Comp Cams XE274R solid roller cam, Fox Lake Stage 2 Trickflow heads, Performer RPM intake, 750 DP carb, Tremec TKO, 9" rear w/ 3.70s and a True-Trac limited slip
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