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#1 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Eaton posi making noise.....
I installed this unit about a year ago and it was fine as I added the friction modifier at the same time. I recently pulled the cover off to fix a leak. I installed Valvoline 85/90 weight and some friction modifier and it seemed fine. After a few months it seemed to leak out again and start making noise. I'm wondering if the friction modifier never really meshed with the gear oil and that is what's leaking out. In any case, last night I drained it again and put some Lucas 80/90 in it. It says on the label that no friction modifier is needed. Now it is making all kinds of noise when I turn.
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#2 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Eaton posi making noise.....
What you are hearing is the fiber clutches grabbing and releaseing. Go to GM and get their additive. Should fix it.
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#3 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Eaton posi making noise.....
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#4 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: Eaton posi making noise.....
Would it be correct to assume that the posi additive you can pick up at Autozone for example, is not adequate? Should I only use the GM additive?
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#5 | |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Eaton posi making noise.....
Quote:
I'm going to go with the GM stuff or maybe try to pick up some of the Eaton additive. |
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#6 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: Eaton posi making noise.....
That is good advise! I just rebuilt my differential and am using the Transx product. I think I will replace the fluid...quickly! Btw...where is the leak in your differential? Reading your post it seems that you believe the Transx product and the leak are related. Is that what you are implying?
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#7 | |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Eaton posi making noise.....
Quote:
Also, I just talked to the guys at the local perfromance shop and they recommended what I did when I first put the posi unit in. Circles and or figure 8's in a big parking lot to "un-glaze" the clutches. I'm going to try that before I give up on the Lucas oil because it's supposed to be pretty decent. I'll post after lunch to see if it worked. |
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#8 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Eaton posi making noise.....
i use royal purple in rears its worth the few dollars more and doesnt require an additive for posi or locker rears
as far as the leak problem next time you remove cover check to see if the bolt holes are dimpled out causeing the leak from overtighting(10-15ftlbs MAX) by far the most common cause of 12bolt leaks cure by getting new cover
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 08-22-2007 at 12:21 PM. |
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#9 | |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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#10 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Eaton posi making noise.....
If it is growling, it is not your posi unit. More like a bearing.
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#11 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Eaton posi making noise.....
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#12 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Eaton posi making noise.....
So I just called the Lucas Oil tech support line and they said depending on the application, wear....etc I may still have to add some sort of modifier. He recommended their oil stabilizer which I already have at home so I'll try that and cross my fingers.
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#13 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Eaton posi making noise.....
Ok add the Gm stuff (stinks like the devil)
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#14 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Eaton posi making noise.....
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#15 |
Registered User
Join Date: Jul 2006
Location: Fair Oaks, CA
Posts: 475
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Re: Eaton posi making noise.....
Use the GM stuff it sticks good and keeps the gear oil from foaming aftermarket anything does not compare. If that wasn't the case GM would just use the aftermarket stuff and put there label on it if it worked better. If you have a newer car under warranty with a posi and you use any aftermarket additives or oil no more warranty, I use GM's 75-140w synthetic with the GM additive with my stock torsion locker in my 97 it has 134,000 and the posi is brand new looking and works great.
__________________
1968 Short Fleet 350/700r4 http://67-72chevytrucks.com/vboard/s...d.php?t=249435 1997 Bagged XtdCab Vortec350/4L60e http://67-72chevytrucks.com/vboard/s...44#post2286144 1993 XtdCab Longbed 4x4 6.5Turbo/NV4500 "Daily Driver" 1985 Toyota XtdCab 4x4 22re/W-56/Dual T-cases, Doug Thorley Header, Homebrew front and rear spring packs, Tons of Mods to suspension and drivetrain, 35" boggers, coming soon ARB's and 5.29's, Possible 4.3/700r4 swap |
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#16 |
Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,756
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Re: Eaton posi making noise.....
Do you have the steel clutches or the carbon fiber clutches?
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'05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer |
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#17 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: Eaton posi making noise.....
Bryan, what is your status on the differential? Did the GM additive solve any problems. JHOW is right....as I was putting the additive in I kept looking around for where the dog had crapped.
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#18 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Eaton posi making noise.....
The GM stuff completely fixed it. Lucas and Redline are amoung the best and state on their label that you don't need to add an additional additive. It was not true in this case. I will from here on out swear by the GM stuff.
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#19 |
Registered User
Join Date: Jul 2006
Location: Fair Oaks, CA
Posts: 475
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Re: Eaton posi making noise.....
right on GM stuff is always better but thats not to say lucas and redline arent a bad product
__________________
1968 Short Fleet 350/700r4 http://67-72chevytrucks.com/vboard/s...d.php?t=249435 1997 Bagged XtdCab Vortec350/4L60e http://67-72chevytrucks.com/vboard/s...44#post2286144 1993 XtdCab Longbed 4x4 6.5Turbo/NV4500 "Daily Driver" 1985 Toyota XtdCab 4x4 22re/W-56/Dual T-cases, Doug Thorley Header, Homebrew front and rear spring packs, Tons of Mods to suspension and drivetrain, 35" boggers, coming soon ARB's and 5.29's, Possible 4.3/700r4 swap |
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#20 |
"Trucks with Class"
![]() Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,133
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Re: Eaton posi making noise.....
Even the genuine GM stuff isn't always a cure-all. My Blazer has the stock original low mileage Eaton posi. The clutches popped on turns, so I cleaned it out and put in new GM rearend lube and posi additive..........it still pops, so I give up & just drive it.
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