jstephens129

i own a 2005 corvette convertible auto with 82k on her which I bought a few weeks ago.. I think I was so excited to buy it that I didn't really notice the rear end noise until I drove it when I got home .. I trailered it home by the way.. I have read many topics on rear end clunk noise but haven't really seen any constant noise topics.. my rear end or tires are making a loud whining noise regardless or speed.. almost sounding like bad wheel bearings .. I tried going in and out of lanes to see if the sound changed which It did not .. and the tires although are not new there certainly not bald.. today im going to change the rear diff fluid with some from autozone and see if it helps but has anyone experienced this noise?

sevinn

Does the noise change with speed or does it change with rpm? What kind of tires, some of them get LOUD when they are old.

jstephens129

When I turn to the left at low speeds in say a parking lot I hear a noise from the rear end. .clanking or rubbing of some sort

jstephens129

It's only when I turn the wheel to the left and the sound is coming from passenger side

Rick369

Make sure you use the correct rear differential fluid and additive in the correct amount.

Mad*Max

sounds like the differential

BearZ06

GM"s recommended is the best now.

jstephens129

I got Mobil 1 synthetic with additive

Rebel Yell

Dave S

Having owned my '05 since new, I'm familiar with just about all the foibles with these models. Rear end noise is usually caused by one of two issues. First are loose rear axle nuts; second is differential fluid with insufficient friction modifier. The DIY fix for either is pretty simple. For the axle nuts, check tightness using a 33mm socket. If any play at all, they should be replaced (GM p/n 10257766). Note that these nuts are "torque conditioned" & should not be reused, although you can tighten the existing nuts (140 ft lbs) to check if that solves the problem. Procedure is to remove the old nuts; apply Red Loctite (hi-temp) to the shaft threads; torque the new nuts to 140 lbs; allow the Loctite to dry overnight before driving. For the diff fluid, you want Dexron LS Gear Oil 75W-90 (GM p/n 88862624). Run the car to hear the old oil; drain & refill. Then run 8 or 10 "figure 8's" somewhere which drives the new oil into the clutch packs in the diff. Hope this all helps.

jstephens129

So your saying not to use the mobile 1 gear oil?well I did and it seems a lot better ..The problem is I don't drive it enough to know if it's really better but I went out in the street and did about 8 complete circles each way and couldn't hear it anymore..I think the constant wheel bearing like sound is the tires..

jstephens129

Never checked axle nuts I will do it tomorrow

Dewayne'sZ06

We had this problem with my wife's 06 convertible, I found that if I went to a Parking lot(Empty one) and did 15-20 Really tight and fast figure 8's it would fix the problem for a few weeks. But once we changed the differential and the additive the problem went away. But the figure 8's worked well for a quick fix

not08crmanymore

Change your rear end fluid first and see if that does the trick.

joeking

I had a 05 since new and changed the rear end fluid twice and there were no metal filings or anything in the fluid. I also added friction modifiers both times and tried Royal Purple Synthetic and the Mobil LS fluid. No problem there. I checked my end links and again no problem. Brought it to a dealer ...same story they couldn't locate the problem. About a week ago I found a link about the axle nuts. I bought 2 of them on EBAY for about $3.99 each and have not had a chance to install them since it snowed out. I am hoping it's the axle nuts too! I have 40,000 miles on the car now and hopefully the axle nuts will solve the problem.

blittle

aaaaah .....ok, i thought the title meant you were the first C6 owner to have a "rear end problem"....at the age many of us are, the possibility of "rear end problems" is fairly significant!!

SmileyOr

This could be used for that . . . other . . . quick fix

Just saying!

joeking

Dave S: Thank you very much for the detailed information. I finally had a chance to install the axle nut. It took a whole five minutes to remove the center cap and install the new axel nut which is the part number you listed. I had quite a difficult time finding a 33mm deep socket or a 1 5/16 socket. I finally located a used socket 1 5/16 from a local pawn shop. It was a 3/4 inch drive which I bought for $5 and I went to Sears and obtained a reducer from 3/4 inch to 1/2 inch and it worked great. The axle nut was easy to remove and was about as tight as a wheel lug nut. I torqued it to the 180 ft lbs and took it for a drive. I couldn't hardly believe my problem was solved. I bought this car new and it has taken me this long to finally pinpoint the problem. Nobody including a Chevrolet dealer could ever tell me what was wrong with the car. I knew it wasn't the rear end because when I drained and refilled the fluid twice I could tell there were no metallic particles in the fluid. Thank you again for the info and I am so happy to have finally fixed this bothersome noise on left hand slow turns. Excellant advice.

AORoads

Well, I hope I'm not telling you something new, Joe, but I hope that isn't the procedure you followed. The last time I read a thread on the axle nut procedure it included new axle nuts (non-reusable), Loctite, and somewhere around 140 ft. lbs. of tightening. There's got to be the most current thread on this topic somewhere...

rmiller86

I don't have any noise from my 05 yet, fingers crossed, but will keep all this in mind.