Noise in Rear Returns!

[ColoradoSteve]

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?

[rb101]

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

[Slam]

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

[ColoradoSteve]

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 isHere'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?

[kdjones2000]

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

[jbaeng]

+ 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.