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#1 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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diff fluid questions?
I just popped the front and rear end diff to change fluids(and see what was up with the front) and found I have a posi rear. since Im planning on changing fluids I was wondering if I should go with a synthetic like royal purple or what?
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57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#2 |
Senior Member
![]() Join Date: Mar 2005
Location: weatherford,texas
Posts: 1,003
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Re: diff fluid questions?
whatever gear oil you choose i would suggest adding a bottle of GM differential additive to it. without it your posi may not work properly.
i run mobil 1 85/90 fs in my posi's... |
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#3 |
Registered User
Join Date: May 2009
Location: Eliot, Maine
Posts: 1,314
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Re: diff fluid questions?
i have RP in my saginaw 3 on the tree and plan to run it in the Ho52 rear when i get the third member swapped for the 4.10 unit i have ready to go. we all know the trans and rear end get worked hard and are often neglected.....good place to spend some extra folding green for the sake of dependability.
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#4 |
mini truck racer
Join Date: Aug 2006
Location: Baytown , texas
Posts: 3,010
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Re: diff fluid questions?
I just changed the ring and pinion and added a fresh rebuilt posi . I am starting with royal purple .
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1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583 |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: diff fluid questions?
synthetic is the way to go
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#6 |
70 Chevrolet=Obsession
Join Date: Jun 2009
Location: nice ca
Posts: 1,067
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Re: diff fluid questions?
In 1989 I put synthetic 80wt. gear oil (Amsoil) in my posi rear end. 100,000 miles later, a few months ago I had the oil changed. The guy at the garage who changed it swore the gears were brand new. Go synthetic. BTW, I used GM limited slip additive. That's the best.
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![]() ![]() ![]() I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner) |
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#7 |
gets board easy.......
Join Date: Mar 2009
Location: Colorado Springs
Posts: 717
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Re: diff fluid questions?
I like Synthetic, but not a MUST for a used rear end,
Reg old 75w90 or 80w90 or 75w140 will do fine with any posi additive for a used posi unit |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: diff fluid questions?
conventional oil will do... but if the funds are there, you are better off with better oil.
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#9 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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Re: diff fluid questions?
thanks guys I never knew you had to ad an additive, good thing I asked you all. tomorrow Ill get some royal purple and some additive and some gaskets as well
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57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#10 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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Re: diff fluid questions?
is there any special additive for the front or is just reg 80/90 do?
__________________
57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#11 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: diff fluid questions?
if you use royal purple theres no need for the posi additive
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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 |
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#12 |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: diff fluid questions?
You should ask GM or Dana what thy think of Amsoil, or any other component manufacture. NONE recommend it as a good synthetic lubricant
Last edited by vegaschevy; 01-05-2010 at 05:50 AM. |
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#13 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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Re: diff fluid questions?
I bought the royal purple but it says limited slip they didnt have one for posi. I bought the additive as well, should I need it or is there an actual posi fluid>?
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57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#14 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: diff fluid questions?
"Posi-traction" is just GMs word for limited slip, like a brand name. It's the same thing. And no, you don't need the additive, it's already there.
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#15 |
I had a V-8
Join Date: May 2003
Location: Phoenix AZ
Posts: 1,116
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Re: diff fluid questions?
GM recommends:
Gear oil: 1052271 and Additive: 1052358 You can use what you want, but that is what Generous Motors recommends.
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1972 K20 Suburban, 5.9L Cummins, Banks Power Pack, NV4500HD, NP205, H.A.D., D60/14FF ARB Link To Build: HERE. |
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#16 | |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: diff fluid questions?
Quote:
The hype with amsoil blows my mind.If it is so great, why does no manufacture recommend it? hmmmm especially one offering a no questions asked warranty..... |
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#17 |
Registered User
Join Date: Nov 2005
Location: Motor City
Posts: 45
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Re: diff fluid questions?
CDowns is right Royal Purple has the additive in it so if you go that route dont buy the posi additive. Oh and on the Amsoil thing in auto transmissions its ****, it soaks into clutches and can cause slipping which is why you will not see it recommended for any allison or many autos for that matter. Amsoil is horrible for almost any auto trans app and even worse in a streetbike application!
Last edited by chaosdsr; 01-05-2010 at 09:44 AM. |
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#18 | |
Account Suspended
Join Date: May 2009
Location: las vegas nv
Posts: 1,493
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Re: diff fluid questions?
Quote:
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#19 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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Re: diff fluid questions?
sahweet, do you guys use a diff cover gasket and some sealant or just some good form gasket stuff? dont wanna leak out all the good stuff lol
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57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#20 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: diff fluid questions?
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#21 |
Senior Member
![]() Join Date: Mar 2005
Location: weatherford,texas
Posts: 1,003
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Re: diff fluid questions?
many gear oil list "for limited slips" on the bottle, but that doesn't mean your posi will like it. before i added the gm ls additive to mine i used some from the local parts store and valvoline 80/90. posi chattered. drained, added gm ls, & mobil 1, no problems.
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#22 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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Re: diff fluid questions?
is there any tips on a sealant and gasket to use that prevent leaks?
__________________
57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#23 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
|
Re: diff fluid questions?
weird went to the parts store today and they dont have a gasket for the dana 44 front at all. It was the same store that was clueless with the motor mounts tho, so I shouldnt have expected any better. did they make on or was he just being lazy?
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57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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#24 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: diff fluid questions?
Yes, there is a gasket for Dana 44, front or rear doesn't matter.
__________________
You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() |
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#25 |
"something witty here"
Join Date: Apr 2009
Location: Salmo, B.C, Canada
Posts: 966
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Re: diff fluid questions?
thats why he couldnt find it, because he most probably was looking for a dana 44 front and all the had was the rear.
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57 chevy 4x4 70 swb fleetside 4x4 68 burb 2wd: 71 burb 2wd: 350 4spd 71 lwb fleetside 4x4: 350/sm465/205/3.07 eaton posi rear 72 lwb fleetside Cheyenne 454/th400 1991 GMC V3500 CC 4x4 |
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