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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Rear Drivelines, Drive Axles and Gearing => Topic started by: Sprinkler-Man on June 07, 2019, 07:18:24 PM

Title: 12 bolt rear end fluid capacity
Post by: Sprinkler-Man on June 07, 2019, 07:18:24 PM
I can’t get my fill plug out but there is a breather vent on the top I can access and fill from. I have been reading to go with 2 quarts but wanted to confirm with the forum.


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Title: Re: 12 bolt rear end fluid capacity
Post by: VileZambonie on June 07, 2019, 08:36:58 PM
Good luck with that. Extract the fill plug and save yourself some aggravation. Is it stripped, what's the problem?
Title: Re: 12 bolt rear end fluid capacity
Post by: Sprinkler-Man on June 07, 2019, 08:49:25 PM
Yes it’s striped. Unfortunately, I don’t have a welder to weld a bolt to it.  I pulled off the breather cap and can blow down through the vent, but this was with the differential cover off. Why do you see a problem? 


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Title: Re: 12 bolt rear end fluid capacity
Post by: Irish_Alley on June 07, 2019, 10:33:39 PM
have to get vile of one of those to confirm but one thing i know you might be able to do is put the right amount of oil in a ziplock and toss it in the differential.
Title: Re: 12 bolt rear end fluid capacity
Post by: bd on June 08, 2019, 12:22:37 AM
have to get vile of one of those to confirm but one thing i know you might be able to do is put the right amount of oil in a ziplock and toss it in the differential.

What??
Title: Re: 12 bolt rear end fluid capacity
Post by: Irish_Alley on June 08, 2019, 03:04:17 PM
i remember seeing on tv a few years ago someone rebuilding a read end. when they filled it they just filled a zip lock full of gear oil and tossed it in. they said the zip lock would break down and it will be ok. but i dont recall what style differential it had. so if they worked on something like a Detroit locker, i dont know if you can do the same for lets say a gov locker
Title: Re: 12 bolt rear end fluid capacity
Post by: Sprinkler-Man on June 08, 2019, 03:44:54 PM
I pulled the vent and put in two quarts. Took me about 15min to do. Now I can take it to a shop to get a bolt welded into the plug to get it out and replace it.


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Title: Re: 12 bolt rear end fluid capacity
Post by: VileZambonie on June 09, 2019, 11:50:30 AM
have to get vile of one of those to confirm but one thing i know you might be able to do is put the right amount of oil in a ziplock and toss it in the differential.

What??

LMAO

Use this: http://www.ctatools.com/index.php?route=product/product&path=59&product_id=150
Title: Re: 12 bolt rear end fluid capacity
Post by: bd on June 09, 2019, 12:29:46 PM
i remember seeing on tv a few years ago someone rebuilding a read end. when they filled it they just filled a zip lock full of gear oil and tossed it in. they said the zip lock would break down and it will be ok. but i dont recall what style differential it had. so if they worked on something like a Detroit locker, i dont know if you can do the same for lets say a gov locker

Why would anybody entertain, let alone recommend, using something that belongs in the county dump to put "clean oil" in a differential?  But then, if it was on TV or UBoob, it must be true....
Title: Re: 12 bolt rear end fluid capacity
Post by: Irish_Alley on June 09, 2019, 03:27:37 PM
its true lol thats kind of why i wanted one of you two to confirm what i saw. glad we got that all cleared up now, but for real i remember them tossing it into the rear then sealing it up and saying something like the gears will break it down in no time
Title: Re: 12 bolt rear end fluid capacity
Post by: JohnnyPopper on June 10, 2019, 09:42:18 PM
OMG

Was it from the '70s or some other mislead era? HeeHaw?
Title: Re: 12 bolt rear end fluid capacity
Post by: Irish_Alley on June 13, 2019, 08:20:28 AM
it was one of those shows on power block or something like that, believe back around 2010.
Title: Re: 12 bolt rear end fluid capacity
Post by: JohnnyPopper on June 13, 2019, 01:11:31 PM
Well, plastic is a byproduct of oil, so in theory it will return to 'natural state'...
Title: Re: 12 bolt rear end fluid capacity
Post by: Irish_Alley on June 13, 2019, 02:24:26 PM
that was my thinking also and why it made sense. but i wasnt sure if somehow it would mess up the clutches on some model rear ends
Title: Re: 12 bolt rear end fluid capacity
Post by: bd on June 13, 2019, 03:24:46 PM
Give it a rest.  Nothing about it makes sense.  It is poor practice!