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Thread: 12 bolt issue, your thoughts
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03-28-2009 #1
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12 bolt issue, your thoughts
Today the rear end in my car developed a strange clunking sound at slow speed / leaving from a stop. It only does it a couple of times until I get up to speed and then it seems ok but I don't want to drive it now until this is figured out.
It almost feels like it is missing a tooth on the axle or ? something and I am noticing it on (what I think) the right rear.
Does anybody have any advice or thoughts they would like to share? Please!
Steve Martin
67 Camaro RS
66 Chevelle
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03-28-2009 #2
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Axle bearing going south?
Might be a good idea to pull the cover, remove the C-clips and take the axles out for a look at the bearings.
While the cover is off you can inspect the gears.
It would be best to try to see what's going on rather than continue to drive it, the cost to repair it will likely increase unless you take some action now.Bart F.
'64 Tempest - LS3/4L70E - Grandma's Poor-Touring car
'64 GTO - 455 HO/TH400 - Ex-bracket racer, street bruiser'02 WS6 convert - LS1/4L60E - Pure stock, pure pleasure
03-29-2009 #3
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Also if reaqr end had previous history of pegleg burn outs or has abused posi it can have spider or locking clutch issues, remove cover and maybe even pull axles to check bearings and axles.
$10 in seals and silicone and $15 in gear oil is much cheaper than total rebuild.
03-29-2009 #4
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Thanks guys, it looks like i'm going in....uuhggg!
Steve Martin
67 Camaro RS
66 Chevelle
03-29-2009 #5
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Hey Steve saw your car at GG on Sat nice looking job. WOW!!!
03-30-2009 #6
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Check the Differential Gears ( Spider Gears)
Jeff Tate
U.S.A.
"The best thing about participating in these events is that you get to hang out with a group of intelligent like minded people who live to achieve things in their lives. You won't find a lazy, mean, or dumb bone in their bodies." Bret Voelkel, RideTech
04-17-2009 #7
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Update: pulled the rear apart and inspected everything....all is good, just did not have enough additive in it!
Now I feel better...lolSteve Martin
67 Camaro RS
66 Chevelle
04-18-2009 #8
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Good for you !!
By the way , are you using synthetic rear-end gear oil ??
If you have a clutch type limited slip differential ( like an Eaton ), synthetic is not recommended.
Use regular rear-end differential lube and a bottle of limited slip additive.
DO NOT USE SYNTHETIC .....
The clutches will chatter....
EDIT : 4/21/09 . I did read some information that some synthetics contain friction modifiers that are suitable to the early
Eaton posi-units , so....... get another opinion...Last edited by JEFFTATE; 04-21-2009 at 05:01 AM.
Jeff Tate
U.S.A.
"The best thing about participating in these events is that you get to hang out with a group of intelligent like minded people who live to achieve things in their lives. You won't find a lazy, mean, or dumb bone in their bodies." Bret Voelkel, RideTech
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