Rear differential oil - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JointTech · 03-19-2013, 02:49 PM

mine didnt have a drain hole. Had to just crack the cover and let it drain.
The fill hole is the square bolt on the back. I had to use the extension hose/straw thing to get it filled.

Lattimer · 03-19-2013, 02:49 PM

Quote:

Originally Posted by Mister-B

Guys I need some quick help. I'm ready to do this, but can't locate the drain or fill plugs. I may have located one that's a square bolt on the back side, but I'm not sure about the fill hole?
Posted via Mobile Device

Some don't have a drain, so you have to pull the back cover off to drain it.

If the square plug in the back is about halfway up, that is the fill.

weaintscared · 03-19-2013, 02:50 PM

I use Royal Purple,,,it's the good stuff..
my build http://67-72chevytrucks.com/vboard/s...d.php?t=468622

*Mister-B* · 03-19-2013, 03:10 PM

Thanks guys!
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*Mister-B* · 03-19-2013, 04:55 PM

Got it all done. I just backed out the bolts a bit and then gently used a flathead screw driver at the bottom to open it up just enough for the fluid to drain, without hurting the gasket.

Boy, this 3/4 ton has one big rear end. Felt like I was working on Jennifer Lopez back there lmao. It took all but one quart of that gallon jug. Thanks for the tip for the pump, Gary. I got one at Autozone, and it made of a very clean job
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*Mister-B* · 03-20-2013, 09:51 AM

This video of a truck driving with a clear diff cover is what made me want to change my fluid ASAP. Glad I did. That old fluid was thick and nasty

http://m.youtube.com/watch?feature=y...ure%3Dyoutu.be
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cadillacart · 01-13-2016, 07:55 PM

My 1972 C/20 has a Dana 60 rear with posi in it and 3.75 quartz filled it.

This unit has floating rear axle, which require you to jack up a side to let some oil run down the tubes and lubricate the wheel bearings.

Hopefully this helps... I thought this info would be easy to find, but I guess not all Dana 60s are the same...

cadillacart · 01-14-2016, 12:37 AM

^^^ sorry to confuse...

2.75 was the actual amount of quartz needed.

Andy4639 · 01-14-2016, 01:33 PM

Quote:

Originally Posted by Mister-B

Thanks everyone. That is one large rear end to need that much fluid

I can only imagine how long it may have gone between being changed. A guy on the forum posted a link to a video of a truck like ours with a clear diff cover. It's amazing how much that fluid gets stirred around. It made me want to change my fluid
Posted via Mobile Device

That would be me!
I just took it off and chunked it in the trash too! The thing kept leaking. It had cracked and was dripping.
I put almost 2 bottles in it before it started coming out the hole.

You Tube

03-19-2013, 02:49 PM	#26
JointTech Registered User Join Date: Feb 2012 Location: Mission Viejo, CA Posts: 1,856	Re: Rear differential oil mine didnt have a drain hole. Had to just crack the cover and let it drain. The fill hole is the square bolt on the back. I had to use the extension hose/straw thing to get it filled. __________________ 72 C20 Long Bed SB350 TH400 14 bolt rear end Extremely boring build thread

03-19-2013, 02:50 PM	#28
weaintscared Registered User Join Date: Mar 2011 Location: Sumter SC Posts: 439	Re: Rear differential oil I use Royal Purple,,,it's the good stuff.. my build http://67-72chevytrucks.com/vboard/s...d.php?t=468622

03-19-2013, 03:10 PM	#29
Mister-B Account Suspended Join Date: Oct 2012 Location: Salt Lake City, Utah Posts: 3,331	Re: Rear differential oil Thanks guys! Posted via Mobile Device

03-19-2013, 04:55 PM	#30
Mister-B Account Suspended Join Date: Oct 2012 Location: Salt Lake City, Utah Posts: 3,331	Re: Rear differential oil Got it all done. I just backed out the bolts a bit and then gently used a flathead screw driver at the bottom to open it up just enough for the fluid to drain, without hurting the gasket. Boy, this 3/4 ton has one big rear end. Felt like I was working on Jennifer Lopez back there lmao. It took all but one quart of that gallon jug. Thanks for the tip for the pump, Gary. I got one at Autozone, and it made of a very clean job Posted via Mobile Device

03-20-2013, 09:51 AM	#31
Mister-B Account Suspended Join Date: Oct 2012 Location: Salt Lake City, Utah Posts: 3,331	Re: Rear differential oil This video of a truck driving with a clear diff cover is what made me want to change my fluid ASAP. Glad I did. That old fluid was thick and nasty http://m.youtube.com/watch?feature=y...ure%3Dyoutu.be Posted via Mobile Device

01-13-2016, 07:55 PM	#32
cadillacart 1972 C/20 Join Date: May 2005 Location: Santa Rosa, Ca Posts: 273	Re: Rear differential oil My 1972 C/20 has a Dana 60 rear with posi in it and 3.75 quartz filled it. This unit has floating rear axle, which require you to jack up a side to let some oil run down the tubes and lubricate the wheel bearings. Hopefully this helps... I thought this info would be easy to find, but I guess not all Dana 60s are the same... __________________ My Gallery 1972 C/20 402 Gramp's Truck

01-14-2016, 12:37 AM	#33
cadillacart 1972 C/20 Join Date: May 2005 Location: Santa Rosa, Ca Posts: 273	Re: Rear differential oil ^^^ sorry to confuse... 2.75 was the actual amount of quartz needed. __________________ My Gallery 1972 C/20 402 Gramp's Truck



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