strange thumping when under power.. need help
04-16-2012, 02:51 PM
#1
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strange thumping when under power.. need help the vehicle is a 00 WS6 with a t-56. after market mods include a PST carbon fiber drive shaft and a moser 12-bolt
The issue I am having started today. I went to switch gears and when i went into 3rd I got a loud thumping. It was almost like the tire got a huge nail in it. As i went faster it got louder and quicker and vise versa. The strange part is when I push the clutch in or take it out of gear, the noise stops. I jacked up the car and ran it, and found the noise to be coming from the drive shaft (or so it sounded like). I disconnected the drive shaft and ran my car though the gears, no noise. I spun the rear wheels manualy, no noise. I even drained the rear gears and found clean oil. I inspected the drive shaft and found normal minor wear. I'll admit i'm not an expert, but i am pretty stumped here.. any thoughts?
Ps no nail,
The issue I am having started today. I went to switch gears and when i went into 3rd I got a loud thumping. It was almost like the tire got a huge nail in it. As i went faster it got louder and quicker and vise versa. The strange part is when I push the clutch in or take it out of gear, the noise stops. I jacked up the car and ran it, and found the noise to be coming from the drive shaft (or so it sounded like). I disconnected the drive shaft and ran my car though the gears, no noise. I spun the rear wheels manualy, no noise. I even drained the rear gears and found clean oil. I inspected the drive shaft and found normal minor wear. I'll admit i'm not an expert, but i am pretty stumped here.. any thoughts?
Ps no nail,
04-17-2012, 04:17 AM
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I.agree in that i have herd that too, but i have put a compleatly.diffeent.drive shaft in n have votten.the exact same noise... ill check.the u-joints on the diff tomorrow but dont remember seeing anything wrong with them.
04-17-2012, 01:13 PM
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I would hold the driveshaft steady and try and turn the joints and see if there is any free play. Even a little bit of play can make a big difference when all the torque is going through there - that was true with my car for sure. My understanding is that most of the time the U-Joint itself looks fine, but inside where the little teeth are, if not kept lubricated it can dry out and those can break or wear out.