Eaton limited slip differential - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Tpo** · 02-12-2024, 02:41 AM

So if I’m to believe the sticker behind my gas tank, my 60 half ton 2WD has a limited slip. After an hour of reading old threads I think I actually know less than I did before I started. Do I have clutches in my carrier that need a posi additive? Can I run old school 80/90 weight gear oil, with the posi additive, and be OK? Does it need to be hypoid oil? I’ve yet to drive it so I don’t know what kinda shape the rear end is in, those clutches may be totally shagged by now.
Thanks!

SkinnyG · 02-12-2024, 11:49 AM

You CAN run a LSD gear oil in an open diff with no problems whatsoever.

You NEED an LSD gear oil in a friction-type LSD.

You do NOT want an LSD gear oil in a Helical/Torsen diff.

Cheers!

**dmb** · 02-12-2024, 12:41 PM

When I worked for Chevrolet , we had an additive that was made from whale oil that we used in the limited slip rears that had clutches in it, but that went out with the whales.
I am sure there is an additive that you can use now.

**Tpo** · 02-12-2024, 07:48 PM

Dmb, I saw that last night while reading through threads. Whales had posi!

**Getter-Done** · 02-12-2024, 08:06 PM

This is what I have seen people use with no issues.

Link: https://shop.advanceautoparts.com/p/...n%20Treatments

02-12-2024, 02:41 AM	#1
Tpo Junior Member Join Date: Feb 2019 Location: Eugene, OR Posts: 95	Eaton limited slip differential So if I’m to believe the sticker behind my gas tank, my 60 half ton 2WD has a limited slip. After an hour of reading old threads I think I actually know less than I did before I started. Do I have clutches in my carrier that need a posi additive? Can I run old school 80/90 weight gear oil, with the posi additive, and be OK? Does it need to be hypoid oil? I’ve yet to drive it so I don’t know what kinda shape the rear end is in, those clutches may be totally shagged by now. Thanks! __________________ 1960 Apache10 long fleetside, 235 and SM420, Brigade Blue and Bombay Ivory

02-12-2024, 11:49 AM	#2
SkinnyG Registered User Join Date: Feb 2012 Location: Beautiful BC, Canada, eh?! Posts: 2,267	Re: Eaton limited slip differential You CAN run a LSD gear oil in an open diff with no problems whatsoever. You NEED an LSD gear oil in a friction-type LSD. You do NOT want an LSD gear oil in a Helical/Torsen diff. Cheers! __________________ 1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate

02-12-2024, 12:41 PM	#3
dmb Active Member Join Date: Sep 2023 Location: randolph va Posts: 159	Re: Eaton limited slip differential When I worked for Chevrolet , we had an additive that was made from whale oil that we used in the limited slip rears that had clutches in it, but that went out with the whales. I am sure there is an additive that you can use now.

02-12-2024, 07:48 PM	#4
Tpo Junior Member Join Date: Feb 2019 Location: Eugene, OR Posts: 95	Re: Eaton limited slip differential Dmb, I saw that last night while reading through threads. Whales had posi! __________________ 1960 Apache10 long fleetside, 235 and SM420, Brigade Blue and Bombay Ivory

02-12-2024, 08:06 PM	#5
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,418	Re: Eaton limited slip differential This is what I have seen people use with no issues. Link: https://shop.advanceautoparts.com/p/...n%20Treatments __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

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