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Author Topic:   vibration problem
thedave66
Gearhead

Posts: 244
From: mountain home, idaho
Registered: Sep 2001

posted 03-25-2002 05:17 PM     Click Here to See the Profile for thedave66   Click Here to Email thedave66     Edit/Delete Message   Reply w/Quote
This last week i've had a drivetrain vibration and I can't track it down.
It started when my driveshaft fell off after one of the straps failed. I put a new u-joint in, bought new straps, and went on my way.
Ever since then though, once I get to about 65 and up I get a vibration in my drivetrain. It's not constant but it repeats about once a second or so. I thought it was overfull of fluid, so I checked, was fine, still vibrated. Rotated the driveshaft 180 degrees, didn't work. Adjusted the clutch, still vibrating.
I was told the driveshaft was probably out of balance so today I went ot the local salvage yard and picked one up out of a 84 mercury cougar. I pulled the old one out and swapped u-joints to the new shaft. It still does it, but it now vibrates between 60 and about 75, then smoothes out.
I'm about out of ideas. I was told that the yoke might have gotten tweaked, but I wanted to check before replacing it. The current drivetrain setup is 289 V-8 with a 5 speed tranny and 8" rearend with 3.00:1 gears. The yoke is an externally balanced one. Any advice I can get would be greatly appreciated.

dave

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 03-25-2002 09:38 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
YOu probably bent the yoke and driveshaft when you dropped it. Have the entire unit balanced and checked for run out.

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thedave66
Gearhead

Posts: 244
From: mountain home, idaho
Registered: Sep 2001

posted 03-25-2002 10:24 PM     Click Here to See the Profile for thedave66   Click Here to Email thedave66     Edit/Delete Message   Reply w/Quote
thanks, I already replaced the drivesdhaft and that did signifigantly reduce the problem, now it only vibrates between 60-70, then it smoothes out. I'll try a new yoke, see if that helps.

dave

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