Weird noise coming from Rear, need desperate help!!

[Zpeed]

hey

went for a long drive today, and this noise in the rear got sudenly louder...

it used to be tame and quiet but it suddenly got louder and now its to loud to ignore...

its a deh deh deh deh noise, only when in motion, and its the same speed as the rotation of the wheels etc coming from the rear area, it could be possible wheel bearings, but its more coming from the middle, and i'm pretty sure it isn't the differantial due to having the same noise, when i had my old 3.7 ratio diff in there, now i have a 3.9... i beleive my diffearntial mount is broken but can't see how it is causing such a noise, i've orderd one from nissan, i can't see any u-joints that are broken, with the movement or anything, my moustache bar is perfect, all bolts are tight, i've got slight movement in my main driveshaft, but i thought that was normal...

i really need to get this fixed, as the noise has got louder i can feel the noise now also... as i changed my diff, i know all the bolts are tight, and nothing that i could see was damage, except for the differantial mount, i'm getting one on tuesday, and hopefully its that, but is there anything else that would cause such a loud repeating, deh deh deh deh deh noise at the speed of the rotating wheels, and also my tyres are good pressure..

i think theres something small i have overlooked or something like that... please help,

[billcapp]

I assumed you have checked for foreign objects (such as Oakland Raider players) being stuck in a tire. GO BUCS!!!!!!!!!!

[billcapp]

I guess in all fairness I should at least try to help more than that. I would recheck the mounting bolts and by all means make sure there is gear oil in the diff.

[Zpeed]

theres plenty of gear oil in the diff, as i changed the diff around 2 months ago, and put new oil in it, and it has no leaks etc etc

any help, even if you think something is stupid. let me hear it,

i will recheck all the mounting bolts in the morning to see 100% that they are 100%, but i checked twice last time i did them, and they were pretty damn tight also

[mperdue]

I frequently have weird noise coming from the rear too - normally after too much Mexican food. Sorry I haven't figured out a way to help that too much!

Sorry - slow day at work....

Michael

[bonniec75209]

Michael, you are silly!!!

[mperdue]

I was also going to make a wisecrack on the "Best head" post but thought that may be going to far (or have I already?)

oh well...

Michael

[beandip]

Peed, If you have checked the half shafts closely and are sure the u-joints are good , the only other thing is the diff , or wheel berrings. Jack up a rear wheel and start the engine and IDLE it in gear and listen to the rear end , you said that y ou just installed the new unit , did you have it apart? Could something have come loose inside ? By spinning the wheel you can listen to both the wheel bering and gears at the same time. Then try the other side.

[ZmeFly]

by the way is it good with chips raising the rear of the car, of course being careful and chocking the front wheels let the car run in first gear at idle to listen to whats wrong with the rear

[Zpeed]

i found the problem, it was the wheel bearings, its all good now, bought some new ones and its fixed

[Walter Moore]

I had a Mercury that was making universal joint noise once. I took it to a dealer and told him I had a bad universal joint. They checked it and couldn't find one so suggested that it may be in the Differential... $80USD later... when they could find nothing wrong in the diff, they tried to re-connect the drive shaft and found that one of the U-joints was frozen.

They were looking for a loose or wobbling U-joint. This one was litereally rock solid. It would not move in one direction. It made a banging noise when it turned. Lucky for me I noticed it before it did take out the differential.

(Most of my passengers couldn't hear the noise I was complaining about...)

I have been told that wheel bearings "usually" make a rumbling noise, not a banging noise.

I also had a brake drum cut in half because I had replaced the pads once too often without having them turned... :stupid: but no one else on the planet is that stupid.

(I mention it because that made a banging noise also.)

[kinfish]

I have similar "deh-deh-...." noise on my '71Z with a used differential I installed. It also is in tune with revolutions. Did you find a specific bearing bad by visual inspection or did you just go in and replace both bearings each side and noise disappeared. How much trobuble did you encounter pulling the axles and removing the bearings.