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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Rear End Lube

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G3GM :: G3 Tech :: Engine & Driveline

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Rear End Lube Empty Rear End Lube

Post by SSTOOLMAN Sat May 21, 2016 7:40 pm

Hey Guys, what are you running for rear end lube? 80/90 conventional? Synthetic/Brand name?
I am going to pull the cover to fix a leak and I am looking for suggestions on what to fill her up with. LOL
What's a good gasket sealer?
I have a 10 bolt posi original to the car with newer 3.42 gears.
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Rear End Lube Empty Re: Rear End Lube

Post by Joe73 Sat May 21, 2016 7:50 pm

I'd use Havoline 80w90 for the oil and I'd use "therightstuff" gasket maker in a tube. Let it set up as per the instructions, then assemble. Permatex also makes some good gasket sealer.
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Rear End Lube Empty Re: Rear End Lube

Post by SSTOOLMAN Sat May 21, 2016 8:43 pm

"therightstuff" gasket maker along with a gasket or alone with no gasket?
How about limited slip additive?
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Rear End Lube Empty Re: Rear End Lube

Post by Joe73 Sat May 21, 2016 10:48 pm

Correction: Its Valvoline that I've been using. http://www.valvoline.com/our-products/grease-gear-oil/high-performance-gear-oil
I didnt use any additive last time I did mine and havent had any chattering. But you can always add it if you have some chattering.

I've been using gasket maker without any paper gaskets. They make a nice bead when you let them set up. And no possibility of any "wicking" over time.
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Rear End Lube Empty Re: Rear End Lube

Post by bracketchev1221 Sun May 22, 2016 8:42 am

Try it without the additive first. That just makes the clutches slip. Dont make them slip more than they have to. And if it's the original differential the clutches aren't probably too tight.
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Rear End Lube Empty Re: Rear End Lube

Post by SSTOOLMAN Sun May 22, 2016 4:16 pm

OK thanks!
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Rear End Lube Empty Re: Rear End Lube

Post by Hawk03 Tue Jun 26, 2018 9:47 pm

Is changing the differential fluid as straight forward as it seems? I have a little leak and want to reseal and add fresh oil. Do non posi rear ends use the same 80/90 oil? How much fluid is needed to refill the diff? Is it better to use sealant vs gasket?
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Rear End Lube Empty Re: Rear End Lube

Post by bracketchev1221 Wed Jun 27, 2018 7:11 am

Just pull the rear cover, let it drain and wipe it all out. HOWEVER, make sure you can get the fill plug out of the side of the differential first. You want to be sure you can refill it to the correct level BEFORE draining it. And any hypoid gear oil is fine for it. Additives in the oil won't affect a non-posi differential.
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Rear End Lube Empty Re: Rear End Lube

Post by Hawk03 Wed Jun 27, 2018 7:38 pm

Cool, seems doable. I won't say easy or quick since that always seems to come back at me.
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Rear End Lube Empty Re: Rear End Lube

Post by Hawk03 Sat Jun 30, 2018 12:32 pm

Hawk03 wrote:Cool, seems doable. I won't say easy or quick since that always seems to come back at me.

Upon further review, it looks like the leak is from the front pinion seal where the drive shaft connects to the differential. That might be a little over my head so I will probably have to take it to a shop to fix.
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