thump sound drive shaft

25

Asked by Dec 09, 2006 at 01:57 PM about the 1998 Chevrolet Tahoe

Question type: Maintenance & Repair

standing still at idle, when acceletaiong there is a "thump sound",(driver's side, maybe under rear passengers's seat.) one explantion has been a sliding shaft in the front drive components. (Vehicle is 4 wheel drive.)

3 Answers

30,115

It could be either the transfer case, transmission, or a crank problem. Any failures with any of those systems could result in a banging or thumping system. There is also the possibility it could be the rear struts but that would be more of a banging when you go over bumps.

1 out of 1 people think this is helpful.

I have had the problem 3 times and fixed it 3 times over a 130,000 mile period. Cost to fix- Almost nothing. The front end of the driveshaft has a sliding spline into the transmission. This spline goes dry and needs to be greased manually. Raise the rear end and make enough room to get under the car. Using a 12mm open end wrench, remove the bolts in the rear universal joint(keeping track of where they go back in, using chalk) and remove the driveshaft. On the front end of the shaft, clean the hollow end of the spline, and put several fingers-full of grease down in it, and make sure it is good and greasy. Reassemble the shaft into the transmission and reconnect the rear u-joint and the job is done. Mine reoccurred in 25,000 miles, so I greased it again. Permanent fix is to spend a couple hundred on a nickel plated yoke for the front end of the shaft. I prefer greasing the original one.

7 out of 7 people think this is helpful.
10

Chevrolet/GMC trucks/tahoes have had a problem since early 90s with trans. yolks sliding. Only fix is to pack with grease. I have 08 silverado. after braking feels like a bump from rear. The yolk slides out during braking. When brake is released the yolk slides or jumps back causing bump or slack.

1 out of 1 people think this is helpful.

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