Noise in Rear Returns!
 

About a month ago, I noticed a sound coming from the rear. It sounds like a helicopter rotor and increases in intervals as the car accelerates. Kind of a wump, wump, wump sound. Anyway, one of the boots on the cv was torn and I figured that had to be the problem. I decided to have both half-shafts rebuilt and just reinstalled them. Well guess what? The noise is still there! Wheel bearings seem to be fine and I just got new tires so I am stumped. I guess they could've screwed up the rebuild on one of the half-shafts, I dunno. Any Ideas?:confused:

Straight line wump, wump, wump can also be a bad tire

^+1. What tires are you running? I had BFGoodrich TAs at one time and they made a helluva racket.

The sound was there with the old tires ( Dunlops ) and I bought new tires ( Firehawks). Sound is still there. Really weird. I'm thinking that one of the cv axles that I just waited a month for is still bad. Maybe wheel bearings but there is no play in the wheels. Here's what I did. I put the rear wheels up on jack stands and started the motor. Put it in gear , the wheels turned and it was making the noise. Then I removed the right cv axle. I started the engine and put it in 2nd gear . No noise. Is that an accurate test? I hate to wait another month to get the stupid thing rebuilt again and I don't know for sure that's what the problem is:mad:Here's another thing; some idiot stripped out the fill plug on the transmission ( I know, should've checked that a year ago) but now I've got to get it out to change the gear oil. Any ideas on how to do that?

My vote is wheel bearings, even if you think they are good.

+ on the bearings. does the wump-wump change if you steer hard side to side or when going around turns? this loads or unloads the bearings (depending on direction you turn) and can verify a bearing problem. even if there is no play you could have a chipped bearing ball or race. good luck.