I've research the forums and gotten some info but I thought that I needed to post my particulars.
After I reached about 85-90 mph, I can hear a moan - a hollow moan (resonance) - but not a vibration coming from the rear. If I drive normally to 85-90mph I don't really hear the moan but if I go WOT to 85-90 I really feel or hear the moan. I don't think it's the drive shaft. I've had bad U-Joints and now they can shake you out of the car. The moan was there for awhile but not really noticeable until I recently installed the upper (FRPP stock replacement) and lower control arms (MM w/spherical end) along with the complete coil over kit, now the moan is even louder. I had 3.73s installed back in 1995 or 1996. I read that these particular LCAs would create road noise but I think l something going on in the rear differential but need a sanity check. Oh by the way, the car is lowered as follows (wheel fender well to ground) Rear = 26.25", Front = 25.875". Also, when the car is in the air, I notice that there is play in the rear wheels when rocking the wheels front to back (i.e. a little slop). I think this is normal but not absolutey positive.
Now during my research, these were 2 responses that caught my attention. These were responses to particular posts.
1. If the rear gears are installed incorrectly, noise and vibration would be felt all of the time thru out the rpm range and not sometimes.
2. Folks suggested removing the dogbone (mine still exists) after installing aftermarket gears.
Below are my questions:
1. Should I remove the dogbone?
2. Could the pinion angle be screwed because the car has been lowered?
3. Is the statement in in No. 1 true or not?
4. What diagnostics should I try?
Thanks for your help and insight
After I reached about 85-90 mph, I can hear a moan - a hollow moan (resonance) - but not a vibration coming from the rear. If I drive normally to 85-90mph I don't really hear the moan but if I go WOT to 85-90 I really feel or hear the moan. I don't think it's the drive shaft. I've had bad U-Joints and now they can shake you out of the car. The moan was there for awhile but not really noticeable until I recently installed the upper (FRPP stock replacement) and lower control arms (MM w/spherical end) along with the complete coil over kit, now the moan is even louder. I had 3.73s installed back in 1995 or 1996. I read that these particular LCAs would create road noise but I think l something going on in the rear differential but need a sanity check. Oh by the way, the car is lowered as follows (wheel fender well to ground) Rear = 26.25", Front = 25.875". Also, when the car is in the air, I notice that there is play in the rear wheels when rocking the wheels front to back (i.e. a little slop). I think this is normal but not absolutey positive.
Now during my research, these were 2 responses that caught my attention. These were responses to particular posts.
1. If the rear gears are installed incorrectly, noise and vibration would be felt all of the time thru out the rpm range and not sometimes.
2. Folks suggested removing the dogbone (mine still exists) after installing aftermarket gears.
Below are my questions:
1. Should I remove the dogbone?
2. Could the pinion angle be screwed because the car has been lowered?
3. Is the statement in in No. 1 true or not?
4. What diagnostics should I try?
Thanks for your help and insight