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Old 07-29-2009, 12:48 PM   #1
vegaschevy
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rear diff lube

I am going to change out the rear diff lube on the truck I just picked up. What is everyone finding works great how much and if it is a factory POSI does it need an additive?

Last edited by vegaschevy; 07-29-2009 at 12:50 PM.
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Old 07-29-2009, 01:02 PM   #2
CPNE
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Re: rear diff lube

Some info here
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67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
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72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
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81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
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Old 07-29-2009, 01:06 PM   #3
vegaschevy
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Re: rear diff lube

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Originally Posted by CPNE View Post
Some info here
thank you, headed to get some 90w oil and some GM additive...

any idea how much goes in it?
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Old 07-29-2009, 01:13 PM   #4
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Re: rear diff lube

Quote:
Originally Posted by vegaschevy View Post
thank you, headed to get some 90w oil and some GM additive...

any idea how much goes in it?
approx 2-3 quarts. The instruction on the additive may specify exactly
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Currently on or near the homestead:

67 Chevy SWB 2WD stepside 350/3 on tree (Pat's)
67 GMC SWB 2WD Fleet 402/auto (Brian's under construction)
67 Chevy 3/4 ton 2WD 402/auto (Business Hauler)
67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
72 Chevy 3/4 ton 4WD (Parts donor)
72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC)
81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
2011 2SS RS Camaro M6 Factory Hurst Shifter

Maybe I need to sell some of this crap

Yet another Bozo with a sawz-all
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Old 07-29-2009, 03:33 PM   #5
vegaschevy
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Re: rear diff lube

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Originally Posted by CPNE View Post
approx 2-3 quarts. The instruction on the additive may specify exactly
nope, just says one bottle per diff, is there a fill hole on the diff? I guess I could go look. Fill till it comes out?
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Old 07-29-2009, 03:36 PM   #6
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Re: rear diff lube

Thats what most people do. I'd put the additive in first obviously. IIRC the fill hole on a 1/2 to is on the passenger side of the diff somewhere. I deal with mostly 3/4 tons which have the fill hole on the diff cover.
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Currently on or near the homestead:

67 Chevy SWB 2WD stepside 350/3 on tree (Pat's)
67 GMC SWB 2WD Fleet 402/auto (Brian's under construction)
67 Chevy 3/4 ton 2WD 402/auto (Business Hauler)
67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
72 Chevy 3/4 ton 4WD (Parts donor)
72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC)
81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
2011 2SS RS Camaro M6 Factory Hurst Shifter

Maybe I need to sell some of this crap

Yet another Bozo with a sawz-all
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Old 07-29-2009, 04:04 PM   #7
gcburdic
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Re: rear diff lube

Hey vegaschevy....pick yourself up a Haynes manual too....has lots of good info in there too....BTW, my fill hole was on the passenger front side of the pumpkin....
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Old 07-29-2009, 04:41 PM   #8
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Re: rear diff lube

ROYAL PURPLE no need for additive with it
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Old 07-29-2009, 04:47 PM   #9
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Re: rear diff lube

i run 85-140 amsoil synthetic with gm additive if its a posi. . you,ll never have to change lube again as its good for 250k miles. 90w is too thin IMO. BEEN A MECHANIC FOR 40+YRS.
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Old 07-29-2009, 05:00 PM   #10
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Re: rear diff lube

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Originally Posted by BCOWANWHEELS View Post
i run 85-140 amsoil synthetic with gm additive if its a posi. . you,ll never have to change lube again as its good for 250k miles. 90w is too thin IMO. BEEN A MECHANIC FOR 40+YRS.
you couldn't pay me to run ANYTHING with AMsoil junk not even my lawnmower
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Old 07-29-2009, 05:04 PM   #11
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Re: rear diff lube

Mobil 1 and Valvoline make 75 or 80W-90 synthetic gear lube. probably a good idea as the pumpkin gets worked hard and the fluid usually doesn't get changed very often.

when i swap the ho52 in my 72 burb to a 4.10 (has stock 4.57) i will be running super expensive royal purple synthetic gear oil because my truck is going to do a lot of towing over the coming years!
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Old 07-29-2009, 08:16 PM   #12
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Re: rear diff lube

i run amsoil in all my semi trucks for over 20 yrs now without a single problem except its $$$$$$$$
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Old 07-29-2009, 08:49 PM   #13
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Re: rear diff lube

For what it's worth, I been running the same Amsoil 80wt. gear lube and GM additive in my GM corp. Posi that I put in twenty years ago and no sounds, no problems.
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Old 07-29-2009, 09:19 PM   #14
vegaschevy
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Re: rear diff lube

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Originally Posted by unclewatts View Post
For what it's worth, I been running the same Amsoil 80wt. gear lube and GM additive in my GM corp. Posi that I put in twenty years ago and no sounds, no problems.
alot of things would work in a diff or a motor for that matter.

however, a multi level marketed product that is endorsed by no one is not something I would run out and purchase. Not to mention most their oils are not approved by many if any companies
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