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#1
11-07-2007, 02:43 PM
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What type of gear oil to use
I've replaced the posi unit in my 67 after blowing it out last week at the dragstrip. I've ordered an Eaton Posi 3 series differential. Question is what type of gear oil are you guys using? Eaton says to use a mineral based oil, not a synthetic, with a friction additive, such as the one GM makes.
What about Vavoline DuraBlend 80w-90? I understand that already contains friction additive.
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"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
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#2
11-07-2007, 03:52 PM
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The Valvoline will work fine but you may have to add the GM friction additive anyway.
Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters  , Hydro-Boost 4-wheel discs, 4 Speed, 3.23 posi.“Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill |
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#3
11-07-2007, 04:22 PM
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If you use the additive use regular gear lube.
My Pontiac 9-3/4" was slipping with additive and gear lube with additive. Brad at Fab-Craft sells a good additive. http://www.fabcraftmetalworks.com/ |
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#4
11-07-2007, 05:28 PM
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Lucas Oil diff lube. It comes with the positive traction additive already added. I use it in everything. Just pick the vescosity for your application. JD
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Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! 
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#5
11-07-2007, 07:51 PM
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Nick, we sell a LOT of Valvoline products here at my shop.
ALL Valvoline "DuraBlend" products are semi-synthetic, so I'd stay away from it. Personally, I use a name brand GL-5 rated 80W90 gear oil, with NO posi additives. If you experience objectionable posi "chatter" on turns, then add a bottle of the posi additive. Posi additives make the oil slipperier, decreasing the "breakaway torque" between the axles. NOT what I want out of a limited-slip diff!
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Regards, "455HO" Lloyd 2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98 
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#6
11-07-2007, 08:12 PM
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I use GM lube and GM additive,I stock piled some when i worked at a dealership
 I have 3 qts and 3 bottles of additive left.  .
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1977 Trans Am,400 4 speed,numbers matching car  1979 Bonneville ,1 owner car... 1997 Trans Am convertible,LT1/auto. |
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#7
11-07-2007, 10:38 PM
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Another vote for Lucas, nothing more needed. -Jim
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#8
11-08-2007, 12:10 AM
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Another Lucas vote here! I run some sort of Lucas product in everything I own. By the way, the high powered, diesel tractor pull guys all swear by their stuff...
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 "Trust me friend, a hundred years goes faster than you think." -Kenny Chesney "Go fast, turn left, hang on, go straight, go faster...who wouldn't wanna piss off 900 angry horses?" 1967 Pontiac Firebird 400 Coupe 1966 Chevrolet Corvair Monza 110 Convertible 1965 Oldsmobile F85 Cutlass 350 HO Coupe, soon to have Olds 403 1970 Chevrolet Nova 383 Coupe, NEW! 2007 GMC Sierra 5.3 Z71 Ext. 2007 GMC Yukon 5.3 SLT |
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#9
11-09-2007, 12:31 AM
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Currently running Mobil 1 plus additive......no problems, but perhaps I'm either in overkill, or the synthetic and additive may not be the best mix. I'm curious to see what others have to say here.
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#10
11-09-2007, 12:36 AM
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As usual there are varying opinions on this particular subject, not only here but on most of the other boards that I visit. I called Eaton today and they stated to NOT USE synthetics with their posi unit. They said use mineral based oil and friction additive. I'll play it safe and go with their recommendation.
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"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
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#11
11-09-2007, 08:45 AM
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I have a EAton posi in my 12 bolt and just run the Autozone brand gear oil with the GM addititive. That was 3 years ago and no problems......
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65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17 63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD) 67 Bonneville ragtop 74 Firebird - 455, e heads, TK0600 in process |
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