Thump sound coming from backend???
Thread Starter
Racer
Joined: Sep 2003
Posts: 261
Likes: 0
From: Hershey Pa
Thump sound coming from backend???
Hi everyone, I have a 2000 FRC 6 speed with 70k miles. Everything works great, no error messages ( traction control, ABS).
When I reverse, the car moves about 2 or 3 feet and I get a pretty loud "bonk" sound from the right rear. It almost sounds as if someone bonks the side of the car with their fist.
Any ideas before I start tearing into the suspension?
It drives and rides fine.
Thanks in advance
JZ
When I reverse, the car moves about 2 or 3 feet and I get a pretty loud "bonk" sound from the right rear. It almost sounds as if someone bonks the side of the car with their fist.
Any ideas before I start tearing into the suspension?
It drives and rides fine.
Thanks in advance
JZ
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
Sort of sounds like a half-shaft hanging up a little. Have you checked them to insure the grease boots are still in place? I would suggest getting the rear off the ground, trans in neutral, front wheels blocked of course then manually turn the rear wheels and see what you see.
Thread Starter
Racer
Joined: Sep 2003
Posts: 261
Likes: 0
From: Hershey Pa
Thanks Dgrant, It's finally warming up a little here in central Pennsylvania, so I will get to check it out.
It sat from Nov til now and the bonk in reverse was very pronounced the first 2 times I got it out. Today - not so much but it still had a sound as if something shifted and made contact inside the trunk when taking off in forward, as it did when I stored it 4 months ago.
Thanks
JZ
It sat from Nov til now and the bonk in reverse was very pronounced the first 2 times I got it out. Today - not so much but it still had a sound as if something shifted and made contact inside the trunk when taking off in forward, as it did when I stored it 4 months ago.
Thanks
JZ
Instructor
Joined: Feb 2005
Posts: 221
Likes: 0
Is your wheel turned to either side while backing up? Seems it's a common problem during colder months.
http://forums.corvetteforum.com/c5-t...-way-left.html
http://forums.corvetteforum.com/c5-t...-way-left.html
Thread Starter
Racer
Joined: Sep 2003
Posts: 261
Likes: 0
From: Hershey Pa
Thanks for the great links.
Mine does it when backing straight out of the garage. Now after driving it a couple days, after sitting 4 months, it went away. But it still thumps a bit when I take off forward.
Mine does it when backing straight out of the garage. Now after driving it a couple days, after sitting 4 months, it went away. But it still thumps a bit when I take off forward.
Racer
Joined: Jul 2010
Posts: 328
Likes: 0
From: Noblesville Indiana
Le Mans Master
Joined: Mar 2002
Posts: 8,466
Likes: 51
St. Jude Donor '17
Hi everyone, I have a 2000 FRC 6 speed with 70k miles. Everything works great, no error messages ( traction control, ABS).
When I reverse, the car moves about 2 or 3 feet and I get a pretty loud "bonk" sound from the right rear. It almost sounds as if someone bonks the side of the car with their fist.
Any ideas before I start tearing into the suspension?
It drives and rides fine.
Thanks in advance
JZ
When I reverse, the car moves about 2 or 3 feet and I get a pretty loud "bonk" sound from the right rear. It almost sounds as if someone bonks the side of the car with their fist.
Any ideas before I start tearing into the suspension?
It drives and rides fine.
Thanks in advance
JZ
It is not the bump sound when the tire is hoping in a slow turn.
My guess is the spline needs to be lubed or something going on with posi traction.
Last edited by Got uid0; Feb 15, 2011 at 10:49 PM.
Thread Starter
Racer
Joined: Sep 2003
Posts: 261
Likes: 0
From: Hershey Pa
IndyVette, the bowling ***** are in there to give it that lowrider look. I do have them contained in the cargo net though.
My guess was the spline also. Is there a drain plug for the diff? If so I'll start with a fluid change.
My guess was the spline also. Is there a drain plug for the diff? If so I'll start with a fluid change.
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