if you havnt changed you rear end gear oil since the 70's you may have this... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tkeduk8r** · 11-12-2007, 10:07 PM

Just doing new brakes, heater core, tranny flush and filter and rear lube as I do with any new vehicle I get... so I cracked the differentil conver on the Dana, and I get this... WOW!!!! thought I only read about this kind of thing....

corn · 11-12-2007, 10:11 PM

Ewwww. Looks like it needs some pepto...

Longhorn Man · 11-12-2007, 10:14 PM

like I ALWAYS say when ppl ask about gears.... drain the oil. It is even more neglected than brake fluid.

1969k10stepside · 11-12-2007, 10:14 PM

Yuck!That's why I always change the fluid in the differentials when I get one if I plan to drive it any,and also why I tell people when they want to know their gear ratio to pull the cover and get the numbers from the ring gear,and replace the oil!

SacramentoJoe · 11-12-2007, 10:20 PM

Just make sure to add some more sawdust in there when you add the new gear-oil. That way, it will still purrrr..

I had some chocolate milk in mine one time...I decided I would not back down into the lake anymore to unload the Jetski. None the less, a couple month later, new carrier bearings.

chev74 · 11-12-2007, 10:44 PM

Quote:

Originally Posted by SacramentoJoe

Just make sure to add some more sawdust in there when you add the new gear-oil. That way, it will still purrrr..

I had some chocolate milk in mine one time...I decided I would not back down into the lake anymore to unload the Jetski. None the less, a couple month later, new carrier bearings.

Sawdust... thats an old rear end remedy. makes em quite

bowtieboy93 · 11-12-2007, 10:50 PM

Quote:

Originally Posted by corn

Ewwww. Looks like it needs some pepto...

72BLUZ · 11-12-2007, 10:51 PM

Just Flush It All Out With Brake Cleaner. And Then Fill It Up With Lucas Oil. And Hope For The Best

Longhorn Man · 11-12-2007, 10:55 PM

I wouldn't bother with lucas... most of there products are snake oil anyways. I WOULD clean it up real good, I would consider pullin the axles too... but once I knew all the water and crap was gone... I'd go with a synthetic oil.

**special-K** · 11-12-2007, 11:00 PM

Did it run out of there or roll like a terd?

dan42 · 11-12-2007, 11:02 PM

I am swapping motors this weekend in my '67 and drained the oil in the SM465, and at least a quart of water came out the bottom. It hadn't been driven with the water (I think it was stored somewhere where the roof leaked) so it was not mixed with the oil, but some nasty chunks came out. We took the top off and blew it out pretty good with brake cleaner - hopefully it's good to go.

72BLUZ · 11-12-2007, 11:09 PM

Synthetic Oil Is Great Stuff, But You Will Find Using Synthetic In Old Gears Will Cause The Gears To Heat Up Quicker. Thats A Fact I Learned Working On And Around Gears In The Shop Where I Work.

Longhorn Man · 11-12-2007, 11:25 PM

to a point yes... but not overheat.

BHRS · 11-13-2007, 09:17 AM

Do the best you can to get the junk out, fill it with good gear oil, run it for 100 miles and drop it again. When you drop it the second time make sure the fluid is at operating temp so it will flow better and the contaminates will be suspended in the oil. Refill will good gear oil and keep your fingers crossed...

Good Luck!!!

72BLUZ · 11-13-2007, 10:38 AM

Let Me Explain It This Way, With All New Gears It Is A Wise Idea To Run Syn. But With Gears With Age And Miles On Them, The Strength In The Metal Has Weakened Over Time. So The Thicker The Oil The Less Heat It Builds. Lucas Works Well In Keeping The Gears Lubed And Keeping Down Heat For More Life

**oldgold70c10** · 11-13-2007, 11:51 AM

Pictures like that make me cringe when I hear my dad say things like "unless its leaking, don't touch it".

68gmsee · 11-13-2007, 11:58 AM

Quote:

Originally Posted by corn

Ewwww. Looks like it needs some pepto...

More like some Keopectate for the runs...

I just did mine on my 68 GMC and it still looked good. However, it only has 28K miles on it...

11-12-2007, 10:07 PM	#1
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	if you havnt changed you rear end gear oil since the 70's you may have this... Just doing new brakes, heater core, tranny flush and filter and rear lube as I do with any new vehicle I get... so I cracked the differentil conver on the Dana, and I get this... WOW!!!! thought I only read about this kind of thing.... Attached Images __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

11-12-2007, 10:11 PM	#2
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Ewwww. Looks like it needs some pepto...

11-12-2007, 10:14 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: if you havnt changed you rear end gear oil since the 70's you may have this... like I ALWAYS say when ppl ask about gears.... drain the oil. It is even more neglected than brake fluid.

11-12-2007, 10:14 PM	#4
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Yuck!That's why I always change the fluid in the differentials when I get one if I plan to drive it any,and also why I tell people when they want to know their gear ratio to pull the cover and get the numbers from the ring gear,and replace the oil! Last edited by 1969k10stepside; 11-13-2007 at 10:39 AM.

11-12-2007, 10:20 PM	#5
SacramentoJoe Always Fixing Things Join Date: Mar 2007 Location: Roseville, CA Posts: 390	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Just make sure to add some more sawdust in there when you add the new gear-oil. That way, it will still purrrr.. I had some chocolate milk in mine one time...I decided I would not back down into the lake anymore to unload the Jetski. None the less, a couple month later, new carrier bearings. __________________ Just an Average Joe ‘68 GMC 307 3spd – My dad's original truck 310,000 miles

11-12-2007, 10:51 PM	#8
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Just Flush It All Out With Brake Cleaner. And Then Fill It Up With Lucas Oil. And Hope For The Best __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan

11-12-2007, 10:55 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: if you havnt changed you rear end gear oil since the 70's you may have this... I wouldn't bother with lucas... most of there products are snake oil anyways. I WOULD clean it up real good, I would consider pullin the axles too... but once I knew all the water and crap was gone... I'd go with a synthetic oil.

11-12-2007, 11:00 PM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Did it run out of there or roll like a terd? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-12-2007, 11:02 PM	#11
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: if you havnt changed you rear end gear oil since the 70's you may have this... I am swapping motors this weekend in my '67 and drained the oil in the SM465, and at least a quart of water came out the bottom. It hadn't been driven with the water (I think it was stored somewhere where the roof leaked) so it was not mixed with the oil, but some nasty chunks came out. We took the top off and blew it out pretty good with brake cleaner - hopefully it's good to go. __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

11-12-2007, 11:09 PM	#12
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Synthetic Oil Is Great Stuff, But You Will Find Using Synthetic In Old Gears Will Cause The Gears To Heat Up Quicker. Thats A Fact I Learned Working On And Around Gears In The Shop Where I Work. __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan

11-12-2007, 11:25 PM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: if you havnt changed you rear end gear oil since the 70's you may have this... to a point yes... but not overheat.

11-13-2007, 09:17 AM	#14
BHRS Registered User Join Date: Sep 2007 Location: Wylie TEXAS Posts: 81	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Do the best you can to get the junk out, fill it with good gear oil, run it for 100 miles and drop it again. When you drop it the second time make sure the fluid is at operating temp so it will flow better and the contaminates will be suspended in the oil. Refill will good gear oil and keep your fingers crossed... Good Luck!!! __________________ 1972 Cheyenne C10 Unrestored Original-3 Owner-RUST FREE Texas Truck Big Block-TH400-PS-PB-AC-AM/FM Radio

11-13-2007, 10:38 AM	#15
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Let Me Explain It This Way, With All New Gears It Is A Wise Idea To Run Syn. But With Gears With Age And Miles On Them, The Strength In The Metal Has Weakened Over Time. So The Thicker The Oil The Less Heat It Builds. Lucas Works Well In Keeping The Gears Lubed And Keeping Down Heat For More Life __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan

11-13-2007, 11:51 AM	#16
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,026	Re: if you havnt changed you rear end gear oil since the 70's you may have this... Pictures like that make me cringe when I hear my dad say things like "unless its leaking, don't touch it". __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel



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