10 bolt Eaton cover upside down? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71400lb · 07-14-2004, 10:20 AM

Okay, I hope this works...first check out this link and look at the picture of the 10 bolt Eaton and take notice of where the drain plug is

http://images.google.com/imgres?imgu...UTF-8%26sa%3DN

Now take a look at MY 10 bolt Eaton, and notice that the drain plug is up higher

http://cgi.ebay.com/ebaymotors/ws/eB...482137824&rd=1

Can it be that the pumpkin was leaking from the drain plug, so the guy put the cover on 180 rotated so that the drain plug was higher, in an attempt to stop the leak? It would make sense, since the drain plug is higher up,so if it's leaking, the pumpkin could only empty out to the point of the drain plug?

Rick

Dean · 07-14-2004, 10:32 AM

Not that it matters, but that is the "fill" plug. These do not have a drain plug. You could definitely get more lube in there with the fill plug up that high. I can't remember if you can put that cover on upside down. You would think I would have done that at least once if it was possible as many as I have torn down...lol

jostrans68 · 07-14-2004, 10:33 AM

that would over fill the rear if he filled it to just where you can touch it through the hole and it would foam out and leak

**COBALT** · 07-14-2004, 12:16 PM

Short answer is: Yes, it's upside down.

Does it matter? It's up to a professional to say. Yes, you don't want to over-fill your case. I believe gear sets need to (max) be 1/2 submerged at most, but that's just been a rule of thumb I've heard, but I would defer to someone who builds axles for a living.

71400lb · 07-14-2004, 03:08 PM

Thanks for the replies. Now the question is, was the cover put back purposely upside down to minimize a drip/leak situation, or was it done by accident?

I'll have to check it tonight more thoroughly to see exactly where it's dripping from.

Rick

Vince M · 07-14-2004, 06:10 PM

I would think the higher you fill it the more it would leak.

1969 GMC · 07-15-2004, 12:11 AM

I'll bet it was done on accident, to put it on upside down would be asking for more problems.

Chevyboy1962 · 07-15-2004, 01:52 AM

The cover is on backwards, mine is towards the bottom. I thought 1960-62's only had this rearend?

Did they have this rearend all the way until '72?

David

Fred T · 07-15-2004, 04:14 AM

GM built that 10 bolt for ages. Not sure when they discontinued it.

As far as the differential cove, filling it that full will cause problems. The oil will foam. Also when the oil gets hot it expands, and the vapor normally goes out the vent. But with that much oil in it, some will be forced out the axle and pinion seals because there won't be enough room.

If the owner wasn't smart enough to put the cover back on right (it will go on either way) you have to wonder what else he did wrong on the truck. I can't see flipping the cover around because the plug leaked, it's cheaper to buy a plug seal than a cover gasket, and a whole bunch easier.

**JIMs70GMC** · 07-15-2004, 04:53 AM

I've heard 47 to 72.

1969 GMC · 07-15-2004, 11:37 AM

I think you are correct Jim, 47 to 72 for the H0 axles.

07-14-2004, 10:20 AM	#1
71400lb 71400lb Join Date: Jun 2004 Location: Charlotte NC Posts: 74	10 bolt Eaton cover upside down? Okay, I hope this works...first check out this link and look at the picture of the 10 bolt Eaton and take notice of where the drain plug is http://images.google.com/imgres?imgu...UTF-8%26sa%3DN Now take a look at MY 10 bolt Eaton, and notice that the drain plug is up higher http://cgi.ebay.com/ebaymotors/ws/eB...482137824&rd=1 Can it be that the pumpkin was leaking from the drain plug, so the guy put the cover on 180 rotated so that the drain plug was higher, in an attempt to stop the leak? It would make sense, since the drain plug is higher up,so if it's leaking, the pumpkin could only empty out to the point of the drain plug? Rick

07-14-2004, 10:33 AM	#3
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	that would over fill the rear if he filled it to just where you can touch it through the hole and it would foam out and leak __________________ [CGTW Member former 67-72 now with a 96 silverado

07-14-2004, 12:16 PM	#4
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Short answer is: Yes, it's upside down. Does it matter? It's up to a professional to say. Yes, you don't want to over-fill your case. I believe gear sets need to (max) be 1/2 submerged at most, but that's just been a rule of thumb I've heard, but I would defer to someone who builds axles for a living. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

07-14-2004, 03:08 PM	#5
71400lb 71400lb Join Date: Jun 2004 Location: Charlotte NC Posts: 74	Thanks Thanks for the replies. Now the question is, was the cover put back purposely upside down to minimize a drip/leak situation, or was it done by accident? I'll have to check it tonight more thoroughly to see exactly where it's dripping from. Rick

07-14-2004, 06:10 PM	#6
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	I would think the higher you fill it the more it would leak. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.

07-14-2004, 10:32 AM	#2
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	Not that it matters, but that is the "fill" plug. These do not have a drain plug. You could definitely get more lube in there with the fill plug up that high. I can't remember if you can put that cover on upside down. You would think I would have done that at least once if it was possible as many as I have torn down...lol

07-15-2004, 12:11 AM	#7
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	I'll bet it was done on accident, to put it on upside down would be asking for more problems. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

07-15-2004, 01:52 AM	#8
Chevyboy1962 C10 now is a GMC Join Date: Jun 2003 Location: Modesto, Ca Posts: 740	The cover is on backwards, mine is towards the bottom. I thought 1960-62's only had this rearend? Did they have this rearend all the way until '72? David __________________ 1962 C10 swb fleetside, big window, custom cab 350/TH350 combo...Hot Rod 1963 C10 lwb fleetside, small window 230/4 speed...Blvd Cruiser *1931 Ford 5 window coupe (soon to be Hot Rod)... Father & Son project

07-15-2004, 04:14 AM	#9
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	GM built that 10 bolt for ages. Not sure when they discontinued it. As far as the differential cove, filling it that full will cause problems. The oil will foam. Also when the oil gets hot it expands, and the vapor normally goes out the vent. But with that much oil in it, some will be forced out the axle and pinion seals because there won't be enough room. If the owner wasn't smart enough to put the cover back on right (it will go on either way) you have to wonder what else he did wrong on the truck. I can't see flipping the cover around because the plug leaked, it's cheaper to buy a plug seal than a cover gasket, and a whole bunch easier. __________________ Fred There is no such thing as too much cam...just not enough engine.

07-15-2004, 04:53 AM	#10
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I've heard 47 to 72. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

07-15-2004, 11:37 AM	#11
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	I think you are correct Jim, 47 to 72 for the H0 axles. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650



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