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Popping sound from Differential. Binding?

P

Piet

Guest
So... finally got the vette on the road last night.
Very Fun!

I notice that I get a popping sound from the rear end. It sounds similar to a wheel hop from a 4X4. Kinda like the differenttial is binding up. I also hear this when comming to a stop. I tends to go away when under way.

Any Ideas?
 

gmjunkie

Well-known member
Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
So... finally got the vette on the road last night.
Very Fun!

I notice that I get a popping sound from the rear end. It sounds similar to a wheel hop from a 4X4. Kinda like the differenttial is binding up. I also hear this when comming to a stop. I tends to go away when under way.

Any Ideas?
The clutches are sticking in the differential from setting!!!It may clear up on it's own!!! Heres something to try,take it to a big parking lot and and back it around in figure 8's 6-8 times and see if that fixes it!! If not change the rear end fluid and put some GM posi-trac additive in and do the same,I'm sure that will take care of it!! It's purdy common after storage!!:upthumbs :D
 

Vette79

Well-known member
Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
I have the same exact issue. We were thinking it was the parking break binding a little with the rotors when moving very slowly. It goes away when pulling on the parking break. I did just put new synthetic limited slip differential fluid in along with a conditioner. Don't know if this has helped yet. I will take gmjunkie's advice and back up a few times and then check. Will keep you posted. Thanks Junk...
 

GTR1999

Well-known member
Joined
Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
Sounds typical of posi clutches. Try the additve you may need 2 bottles. The 71-79 clutches are not very good and I have found many that were broken while blueprinting them. If the additive doesn't work try sucking out all the old oil and using fresh oil and additive. Otherwise you may need to drop the diff if it get worse.
 

HammerDown

Well-known member
Joined
Jan 23, 2003
Messages
473
Location
Glenolden Pa
Corvette
1981 White/ Red int.
Mine has done this for the past 20+ years. When I service/chanks out the Fluid and add 2 bottles of GM additive it goes away for a short time but, back it comes. clump-clump-clump only when coasting to a stop.:eyerole
 

THORIN

Well-known member
Joined
Nov 19, 2004
Messages
98
Location
Minneapolis
Corvette
1976 coupe
I just had my differential rebuilt. He filled it with a synthetic, plus a bottle of additive. After driving a few hundred miles mine started to do that. I took it back in, He removed enough fluiid to add a second bottle of the additive and that seems to have solved the problem
 
P

Piet

Guest
I added one bottle..... I still makes a creaking sound from time to time... going to add another bottle.
 

GTR1999

Well-known member
Joined
Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
On another vette forum I have posted a how to in rebuilding these. Look it over in case you need to go into it deeper
 

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