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1999 Convertible driveline vibration

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Old 12-14-2010, 08:32 AM   #1
Join Date: Dec 2010
Vehicle: 1999, Ford, Mustang Convertible
Location: WV
Posts: 1
Question 1999 Convertible driveline vibration

I just bought this 1999 Mustang Convertible, V6 automatic. When I get to 50 MPH a vibration occurs that can be felt through the seats. It's a low frequency rumble that is from 50 to 60 MPH only. You can feel it though your whole body. Also, it only does it under power. As soon as you back off the throttle it disappears. I don't detect any clunking, thinking it was a bad u-joint but I've only driven it 300 miles mostly on the highway. I originally thought it may be tires but when I noticed the pattern of vibration under load, no vibration under no load it got me concerned. I never owned a Mustang before so any feedback/help is greatly appreciated.
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Old 12-14-2010, 10:43 AM   #2
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Join Date: Aug 2008
Vehicle: 08 GT Vert, 02 GT Vert
Location: Panama City, FL
Posts: 1,214

First of all, I would have the tires balanced and checked for bent rims or separated tires. This would eliminate a common source. If that does not change the vibration, you might try rotating the drive shaft 180* on the mount to the rear end. Easy to do and could change how thing vibrate. Bad u-joints do not always "clunk" either. Do one thing at a time to see what makes a difference.
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I wake up in the morning with nothing to do and by supper time, I have half of it done.

2008 GT Vert, stock
2000 Lightning, s/c, tuned, Basanni, built tranny
Previous Mustangs:4 - '66 Coupes(silver/blue/grey/red) '87 GT HO, '00/'02/'07 GT Vert(red)(grey)(black), '68 Coupe, '11 GT/CS
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Old 12-14-2010, 05:56 PM   #3
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Vehicle: 99 GT 35th LE auto
Location: Maryland
Posts: 1,503

it's definitly the drivetrain but don't think it's u-joints. Probably doing it after the tranny shifts into OD, that's when there's more torque on the drivetrain. Flawed, or loose, engine or transmission mounts are my guess.
'04 Mach 5 spd: bolt-ons, n/a.....12.09 @ 113...SOLD
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Old 12-14-2010, 05:56 PM
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00, 1999, 60, automatic, drive, driveline, gt, line, load, mount, mustang, transmission, v6, viberation, vibration

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