Noob with Diff problems
Noob with Diff problems I dont know if I should be concerned or not, I am pretty mechanically inclined but I am new to these F-body cars please give advice...
I bought a 2002 M6 z28 w/69k bone stock w/stock 10bolt, stock gears, a few weeks ago from a private seller. I noticed a good amount of noise coming from the rear of the vehicle. It sounded to me like bad wheel bearings. I asked the owner during the test drive about it, the owner had the vehicle since 26k and said it always made that noise since he had it. It didnt seem clunky or make any grinding noise so I figured I would take they guys word still buy the car and take a gamble on wheel/axle bearings.
This past weekend I tackled the bearings. I inspected rotated the drive shaft to make sure all the teeth were present on the gears, the usual metal paste on the magnet, no chunks of metal and operation seemed smooth. Removed the axles and inspected them, no wear in the the bearing area.
I replaced the axle bearings and am still getting the noise. I backed the car in to a sandy area of pavement, gave a quick mash of gas verified both wheels spin and verified the limited slip was working.
Even though it seems to be operating properly is this thing gonna just grenade itself?
I bought a 2002 M6 z28 w/69k bone stock w/stock 10bolt, stock gears, a few weeks ago from a private seller. I noticed a good amount of noise coming from the rear of the vehicle. It sounded to me like bad wheel bearings. I asked the owner during the test drive about it, the owner had the vehicle since 26k and said it always made that noise since he had it. It didnt seem clunky or make any grinding noise so I figured I would take they guys word still buy the car and take a gamble on wheel/axle bearings.
This past weekend I tackled the bearings. I inspected rotated the drive shaft to make sure all the teeth were present on the gears, the usual metal paste on the magnet, no chunks of metal and operation seemed smooth. Removed the axles and inspected them, no wear in the the bearing area.
I replaced the axle bearings and am still getting the noise. I backed the car in to a sandy area of pavement, gave a quick mash of gas verified both wheels spin and verified the limited slip was working.
Even though it seems to be operating properly is this thing gonna just grenade itself?
Last edited by Scoobysnacks; Oct 26, 2010 at 12:01 PM. Reason: added stock gears
Sorry, yes, they are stock gears. I am starting to get the impression that 10bolts can have several issues from what I have read, and some have good luck with them. I was just concerned that this will grenade on me during normal driving conditions. Though the car is stock I was planning on doing some bolt ons in the future. I dont want to waste $$ on those if I should upgrade to a 12bolt or 9" first.
It depends really. Its the hard launches and sticky tires that hurt it faster. Due to tuition expenses I dont have 3k laying around to buy a whole rear end and all of the supporting nonsense. So I rebuild it and it holds up ok.. I dont go to the track though and I have 4.10s so im sure i will be due for a re build in the spring but I beat on my car. ha. It shouldn't grenade just when they finally go out it will be a terrible whine from the rear. Usually 4.10s will whine anyways which i why i asked if they were stock gears.
It depends really. Its the hard launches and sticky tires that hurt it faster. Due to tuition expenses I dont have 3k laying around to buy a whole rear end and all of the supporting nonsense. So I rebuild it and it holds up ok.. I dont go to the track though and I have 4.10s so im sure i will be due for a re build in the spring but I beat on my car. ha. It shouldn't grenade just when they finally go out it will be a terrible whine from the rear. Usually 4.10s will whine anyways which i why i asked if they were stock gears.
Yessir. I had my buddy put the car on an alignment machine and jacked only the rear of the car up and brought it to 30mph and the noise is present. Mine makes noise no matter what speed I am going.
Staging Lane
Joined: Aug 2006
Posts: 61
Likes: 0
From: Breaux Bridge, Louisiana
The original owner might have changed the gears and they were noisy from the start. It might have still been in warranty when the second owner purchased it with 26K. If so why didn't he have it fixed under warranty. What ratio is it supposed to be and have you checked the speed vs rpm to make sure it's correct?
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I dont know why the original owner or the guy I bought it from didnt have it fixed. Some people are strange like that and dont get things fixed under warranty its like they dont want to be bothered, my inlaws for that matter buy cars, never service em and drive them till there is no oil and the tires run flat 
I am not sure how to do the speed rmp ratio you are talking about, I will have to search it. For what I know its around 1,400rpms at 60-65mph in 6th.
I am not sure how to do the speed rmp ratio you are talking about, I will have to search it. For what I know its around 1,400rpms at 60-65mph in 6th.
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