What kind of lube do I use for my Rearend? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 Suburban · 01-21-2004, 01:56 PM

Not vasaline or KY.....

I noticed that there are basically 2 weights of gear lube. 80w90 and then there is a 85w140. I know the 80w90 will be better for the mileage, but will it offer enough protection?

I do plan to use a synthetic gear lube, so maybe the protection worry is not a problem?

Also, How many quarts do I need for a 12 bolt? Thanks

**CPNE** · 01-21-2004, 02:07 PM

I alway have used 80w90 here in cold country. Last time I did this I bought 3 qts and used a little over 2.

MrShelley · 01-21-2004, 02:08 PM

The title of this thread is just ASKING for trouble! LOL

cdowns · 01-21-2004, 02:09 PM

80/90 is the weight to use takes about 2quarts

68 Suburban · 01-21-2004, 02:10 PM

Quote:

Originally posted by MrShelley
The title of this thread is just ASKING for trouble! LOL

But, it got you to read the thread

71Chev · 01-21-2004, 03:20 PM

After I change the fluid I take it for a short drive and I check the level again, usually takes just a little more to top it off again.

Ole Blue · 01-21-2004, 05:45 PM

I'd check with the doctor on this one!

*rage'nrat638* · 01-21-2004, 05:54 PM

vasaline or KY.....

be a man.....use some SPIT

*67Fleetsidedream* · 01-21-2004, 05:55 PM

80-90w here also. No synthetic.

cochino12 · 01-21-2004, 07:01 PM

Quote:

Originally posted by rage'nrat638
vasaline or KY.....

be a man.....use some SPIT

thats funny

68 Suburban · 01-21-2004, 07:27 PM

All done lubing the rear. And might I say, my rear looked damn good

bow-tie-bandit · 01-21-2004, 08:37 PM

I'll stay away from this one.

Blue Beard · 01-21-2004, 09:53 PM

Why stay away from it, he just keeps asking for it................

FRENCHBLUE72 · 01-21-2004, 09:57 PM

I use 80/90 valvoline..

CG · 01-21-2004, 11:01 PM

now thats a bad case of hemroids

67gmcss · 01-21-2004, 11:18 PM

one person said no synthetic....any reason, or just preference?

68 Suburban · 01-21-2004, 11:34 PM

Quote:

Originally posted by 67gmcss
one person said no synthetic....any reason, or just preference?

I think he was just stating what was in his, not condeming synthetic.

*rage'nrat638* · 01-21-2004, 11:41 PM

Quote:

Originally posted by 67gmcss
one person said no synthetic....any reason, or just preference?

i would not just go use synthetic in a 30 year old, plus rear end with out putting all new seals in....
it's much thinner like motor oil and you are sure to get leak's...
synthetic is supposed to be the hot ticket for race rear ends..
less power loss....less wear.....

but in a old truck?????8.00 a qt.!!!!!!!!no new seals...i won't

68 Suburban · 01-22-2004, 01:18 AM

To late, and it was only $6.99 a quart

Those rumors of synthetic wiping out seals have been around for a long time. I have never had a problem in any older vehicle that I have run synthetic products.

Longhorn Man · 01-22-2004, 01:21 AM

I swapped my rear over to synthetic too, and haven't had any problems.
I think the axle seals on my truck ar ethe only seals that DON'T leak.

dinnut · 01-22-2004, 01:28 AM

its true that it is the only seal that doesnt leak, or at least on my truck

my oilpan, my rear main seal, my ps gear box, my tranny, all leak but not my rear end!

djracer · 01-22-2004, 01:30 AM

If its a posi don't forget to add the additive for the clutches!

**MJN** · 01-22-2004, 01:31 AM

I've never had a problem running synthetic and in rear ends and transmissions (manuals of course). I always check the manuals I have before changing fluids too just to get a good idea of how much to get and what weight. Usually 80w90 for rears, fronts and trannies. If you have posi, always run the GM additive, never had any problems with that stuff, it's a little spendy but it really works.

68 Suburban · 01-22-2004, 01:37 AM

Quote:

Originally posted by djracer
If its a posi don't forget to add the additive for the clutches!

My rear is not a posi, but what I have read, it has the additives in it

01-21-2004, 01:56 PM	#1
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	What kind of lube do I use for my Rearend? Not vasaline or KY..... I noticed that there are basically 2 weights of gear lube. 80w90 and then there is a 85w140. I know the 80w90 will be better for the mileage, but will it offer enough protection? I do plan to use a synthetic gear lube, so maybe the protection worry is not a problem? Also, How many quarts do I need for a 12 bolt? Thanks Last edited by 68 Suburban; 01-21-2004 at 01:58 PM.

01-21-2004, 02:07 PM	#2
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	I alway have used 80w90 here in cold country. Last time I did this I bought 3 qts and used a little over 2. __________________ 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

01-21-2004, 02:09 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	80/90 is the weight to use takes about 2quarts __________________ 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

01-21-2004, 03:20 PM	#6
71Chev Senior Member Join Date: Dec 2000 Location: Indiana Posts: 3,074	After I change the fluid I take it for a short drive and I check the level again, usually takes just a little more to top it off again. __________________ 71 Chevy CST Long Fleet 350/350/3.07 leaf rear.

01-21-2004, 05:45 PM	#7
Ole Blue Registered User Join Date: Sep 2003 Location: Holts Summit, Mo. Posts: 58	I'd check with the doctor on this one! __________________ 72 Cheyenne Super waiting on 4/6 drop,BB and 700r4

01-21-2004, 02:08 PM	#3
MrShelley Too Many Clubs Club Join Date: Jul 2003 Location: Kilgore, Texas Posts: 443	The title of this thread is just ASKING for trouble! LOL

01-21-2004, 05:54 PM	#8
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	vasaline or KY..... be a man.....use some SPIT

01-21-2004, 05:55 PM	#9
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	80-90w here also. No synthetic.

01-21-2004, 07:27 PM	#11
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	All done lubing the rear. And might I say, my rear looked damn good

01-21-2004, 08:37 PM	#12
bow-tie-bandit Live life and be happy. Join Date: May 2003 Location: Spokane,Washington Posts: 266	I'll stay away from this one. __________________

01-21-2004, 09:53 PM	#13
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	Why stay away from it, he just keeps asking for it................ __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

01-21-2004, 09:57 PM	#14
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	I use 80/90 valvoline.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

01-21-2004, 11:01 PM	#15
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 20,019	now thats a bad case of hemroids

01-21-2004, 11:18 PM	#16
67gmcss Registered User Join Date: Jan 2002 Location: somerset,kentucky,usa Posts: 154	one person said no synthetic....any reason, or just preference?

01-22-2004, 01:18 AM	#19
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	To late, and it was only $6.99 a quart Those rumors of synthetic wiping out seals have been around for a long time. I have never had a problem in any older vehicle that I have run synthetic products.



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01-22-2004, 01:21 AM	#20
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I swapped my rear over to synthetic too, and haven't had any problems. I think the axle seals on my truck ar ethe only seals that DON'T leak.

01-22-2004, 01:28 AM	#21
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	its true that it is the only seal that doesnt leak, or at least on my truck my oilpan, my rear main seal, my ps gear box, my tranny, all leak but not my rear end! __________________ 70 longbed 496/th400/Ford 9"

01-22-2004, 01:30 AM	#22
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,892	If its a posi don't forget to add the additive for the clutches! __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!

01-22-2004, 01:31 AM	#23
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	I've never had a problem running synthetic and in rear ends and transmissions (manuals of course). I always check the manuals I have before changing fluids too just to get a good idea of how much to get and what weight. Usually 80w90 for rears, fronts and trannies. If you have posi, always run the GM additive, never had any problems with that stuff, it's a little spendy but it really works. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

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