Rear End knocking noise
Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,770
Likes: 33
From: Cohasset MN
2017 Corvette of the Year Finalist
2016 C1 of Year Finalist
Rear End knocking noise
My '86 with 88K miles and automatic has developed a rear end noise that sounds like a knock at several times a second. It is not a grinding or higher frequency noise. I notice it at higher speeds (30 or more MPH) whether accelerating or coasting. It is not particularly loud but still annoying.
Just wondering if it could be universal joints or a rear bearing. I cannot tell if it is coming from one side or both. Any ideas?
Just wondering if it could be universal joints or a rear bearing. I cannot tell if it is coming from one side or both. Any ideas?
Melting Slicks
Joined: Jan 2014
Posts: 2,178
Likes: 380
From: Lunenburg MA
The only way to tell is to get under there and see if anything is loose. At 88K it wouldn't be the worst idea to change the 6 U-joints anyway. Could also be a wheel bearing or even a brake issue.
Melting Slicks
Joined: May 2014
Posts: 2,857
Likes: 583
From: New Port Richey FL
If you have the car Properly supported start the car drop into gear and give a look no touch inspection (we don't want an episode of the day I did something dumb) listen for your noise
Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,770
Likes: 33
From: Cohasset MN
2017 Corvette of the Year Finalist
2016 C1 of Year Finalist
I jacked up the rear end today and checked for looseness on the rear wheels. There was excessive play. I started it up and ran in gear and definitely heard the familiar knocking noise. While under there, I checked the U joints on the drive shaft and half shafts. Everything was tight.
Looks like I will be replacing the rear bearing assemblies. From what I have read, it is not a particularly difficult job.
Looks like I will be replacing the rear bearing assemblies. From what I have read, it is not a particularly difficult job.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
I jacked up the rear end today and checked for looseness on the rear wheels. There was excessive play. I started it up and ran in gear and definitely heard the familiar knocking noise. While under there, I checked the U joints on the drive shaft and half shafts. Everything was tight.
Looks like I will be replacing the rear bearing assemblies. From what I have read, it is not a particularly difficult job.
Looks like I will be replacing the rear bearing assemblies. From what I have read, it is not a particularly difficult job.
Even look at 36mm spindle nut...it should be around 164 ft/lb for mine is that dont know your year
