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Popping coming from my 8-3/4"
#84994
07/06/08 09:27 PM
07/06/08 09:27 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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My 8-3/4" was rebuilt a year ago with all new bearings, seals, and a new clutch style sure-grip unit. It gives me a pretty heavy popping sound that you can feel when coming out of a slow speed tight corner. It never does it on a straightaway. At first I assumed it was the tight new sure grip unit struggling a little to slip around the corner. It also will turn over the inside tire a little bit on tight turns. But, its been a year or so now (approx. 2500 mi.) and its still making this noise. Could something be wrong in there? or is this normal? It was set up by a pro and I'd take it back to him, but it was a used gear-set and he said he wouldn't warranty it because of that. I may still end up taking it to him to check out, but what do you guys think of this....
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Popping coming from my 8-3/4"
[Re: StealthWedge67]
#84995
07/06/08 09:29 PM
07/06/08 09:29 PM
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Anonymous
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Anonymous
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are you using the GM hypoid additive?
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Re: Popping coming from my 8-3/4"
[Re: StealthWedge67]
#84996
07/06/08 09:53 PM
07/06/08 09:53 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
and a new clutch style sure-grip unit
I'm pretty sure the sound is the clutches sticking instead of slipping. I think it will grind itself to death without the correct sure-grip additive. 
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Re: Popping coming from my 8-3/4"
[Re: Lefty]
#84997
07/06/08 10:32 PM
07/06/08 10:32 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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OP
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Posts: 4,319
Puyallup, WA
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I'm using the Ford limited slip additive. Should I drain it & refill with fresh gear-oil & additive?
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Popping coming from my 8-3/4"
[Re: StealthWedge67]
#84998
07/06/08 11:46 PM
07/06/08 11:46 PM
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Anonymous
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Anonymous
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fords additive plain sucks. damage is already done IMO. time to tear it apart.
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Re: Popping coming from my 8-3/4"
#84999
07/08/08 11:30 AM
07/08/08 11:30 AM
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Joined: Jan 2003
Posts: 9,982
Ansonia, CT
CJK440
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master
Joined: Jan 2003
Posts: 9,982
Ansonia, CT
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I use Posi-X fluid from the major parts chain.
I had this problem before and all I did was jack up the pass side of the axle only. open the fill plug and dump another tube of additive in it.
All good now.
2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
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Re: Popping coming from my 8-3/4"
#85000
07/08/08 11:33 AM
07/08/08 11:33 AM
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Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
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Quote:
fords additive plain sucks. damage is already done IMO. time to tear it apart.
Actually Ford's additive is highly regarded. Its been a good choice for MANY years!
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Re: Popping coming from my 8-3/4"
[Re: CJK440]
#85001
07/08/08 11:38 AM
07/08/08 11:38 AM
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Joined: Jan 2003
Posts: 17,844
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,844
S.E. Michigan
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Quote:
I use Posi-X fluid from the major parts chain.
I had better results with that stuff than the Ford additive.
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Re: Popping coming from my 8-3/4"
[Re: DoctorDiff]
#85004
07/08/08 12:41 PM
07/08/08 12:41 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
That is a common problem. New, off-the-shelf clutch sure-grips are rarely assembled correctly. If a fresh change of gear lube and friction modifier doesn't do the trick, I would disassemble the unit, clean everyting then de-burr the casting around the clutch ears if needed. Be sure to pre-lube the clutch plates with straight friction modifier on assembly.
I prefer Ford friction modifier because it is actually rebranded OEM Spicer stuff.
how about the GM syntho stuff (w/ modifier)? That's what I just put in my unit.
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Re: Popping coming from my 8-3/4"
[Re: DoctorDiff]
#85006
07/08/08 09:44 PM
07/08/08 09:44 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Well, I'll try draining as much as I can out of it, then refilling it and adding another bottle of friction modifier. I'll report back when I get this done. Thanks guys (except the guy who wants me to rebuild it already.  For gods sake, man.... I'm glad you don't have my credit card!)
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Popping coming from my 8-3/4"
[Re: StealthWedge67]
#85007
07/08/08 10:01 PM
07/08/08 10:01 PM
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Anonymous
Unregistered
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Anonymous
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Quote:
Well, I'll try draining as much as I can out of it, then refilling it and adding another bottle of friction modifier. I'll report back when I get this done.
Thanks guys (except the guy who wants me to rebuild it already. For gods sake, man.... I'm glad you don't have my credit card!)
yah 2500miles still making noises, and you think a fluid change is the cure. 
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Re: Popping coming from my 8-3/4"
#85010
07/09/08 03:10 PM
07/09/08 03:10 PM
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Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
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Quote:
Quote:
Well, I'll try draining as much as I can out of it, then refilling it and adding another bottle of friction modifier. I'll report back when I get this done.
Thanks guys (except the guy who wants me to rebuild it already. For gods sake, man.... I'm glad you don't have my credit card!)
yah 2500miles still making noises, and you think a fluid change is the cure.
I would follow DoctorDiffs advice any day.
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Re: Popping coming from my 8-3/4"
[Re: Pacnorthcuda]
#85013
07/09/08 06:34 PM
07/09/08 06:34 PM
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Anonymous
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Anonymous
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Quote:
Quote:
Quote:
Well, I'll try draining as much as I can out of it, then refilling it and adding another bottle of friction modifier. I'll report back when I get this done.
Thanks guys (except the guy who wants me to rebuild it already. For gods sake, man.... I'm glad you don't have my credit card!)
yah 2500miles still making noises, and you think a fluid change is the cure.
I would follow DoctorDiffs advice any day.
good for you 
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Re: Popping coming from my 8-3/4"****update******
#85014
10/21/08 09:43 PM
10/21/08 09:43 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Just donned on me the other day that I never hear that popping sound anymore. draining and refilling with Napa friction modifier (as opposed to ford motorsport the first time) was all I did. It didn't stop immediately, but some months later now, & I can't remember the last time I heard it.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Popping coming from my 8-3/4"
[Re: Mr.Yuck]
#85018
10/22/08 01:04 PM
10/22/08 01:04 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
You have a broken tooth or teeth on the ring gear
Zing!  Reading is a lost art...
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Re: Popping coming from my 8-3/4"
[Re: 69Cuda340S]
#85019
10/22/08 01:08 PM
10/22/08 01:08 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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Long time ago when mine got noisy I did slow figure 8s (to work the lude into the clutches) in the parking lot after I put the additive in. Worked for me.
This was on a One ton chevy with a Dana.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: Popping coming from my 8-3/4"
[Re: HealthServices]
#85020
10/22/08 05:36 PM
10/22/08 05:36 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I have an 8 3/4 rear right like yours but with 410 gears. Mine did the same exact thing yours is doing. I put a bottle of the mopar snake oil additive in it and it totally stopped doing it.I would try it before tearing it apart.
Thanks Moparts
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