Lube and Additive for 12 Bolt with Eaton Posi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C10_ustacould · 10-05-2013, 01:57 PM

My 8 month old Eaton posi started making noise in turns over the last couple of weeks. I drained the "old" lube and filled it with Mobil 1 75w-90 and a tube of Trans-X posi additive. It still pops... Does anyone have a better option that is available at the local part store?

Katrina/10 · 10-06-2013, 08:09 AM

GM limited slip additive.

**D.PASSMORE** · 10-06-2013, 08:25 AM

Quote:

Originally Posted by katrina/10

gm limited slip additive.

x2

DGulliver · 10-06-2013, 08:48 AM

x3 on the GM Limited Slip Additive. Whale oil is your 'active ingredient'.

C10_ustacould · 10-06-2013, 08:52 AM

I couldn't find any "GM" LSA so I put a second bottle of Trans-X in it to see if that will help. If no good than I will ask my dealer to order a couple of bottles and a gasket so I can do another service on it.

*Fitz* · 10-06-2013, 10:18 AM

Quote:

Originally Posted by Bucks68

I couldn't find any "GM" LSA so I put a second bottle of Trans-X in it to see if that will help. If no good than I will ask my dealer to order a couple of bottles and a gasket so I can do another service on it.

Your diff is chattering because the clutches are not slipping when they should. You can order the GM or AC Delco additive from Summit Racing, Jegs, Amazon, Pace Performance or...your local GM dealer.

C10_ustacould · 10-06-2013, 10:43 AM

Yep, I completely understand the why but I was hoping someone had a good experience with a product available at a local auto parts store. I am going to order some of the GM additive as a back up, but I am hoping adding more of the Trans-X additive will get me through Cruising the Coast. I added Trans-X when I installed the all new rear-end at the end of February, which leads me to believe it is inferior. The problem is there is nothing else available locally.

Katrina/10 · 10-06-2013, 12:17 PM

I tried other products also, but nothing worked for me except the GM additive. Most dealerships used to keep it in stock, but I haven't bought any lately.

cdowns · 10-06-2013, 12:30 PM

i always used royal purple in my posi rears and needed no additves the stuff worked great and they were all heavily used himilage trucks not unusal to carry heavy loads to swapmeets and flea markets with 1500mile weekends the norm

C10_ustacould · 10-06-2013, 04:23 PM

I took the truck for a spin between rain showers and it was quiet out back.

10-05-2013, 01:57 PM	#1
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,870	Lube and Additive for 12 Bolt with Eaton Posi My 8 month old Eaton posi started making noise in turns over the last couple of weeks. I drained the "old" lube and filled it with Mobil 1 75w-90 and a tube of Trans-X posi additive. It still pops... Does anyone have a better option that is available at the local part store? __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD

10-06-2013, 08:09 AM	#2
Katrina/10 Registered User Join Date: Oct 2010 Location: Ocean Springs, MS Posts: 1,746	Re: Lube and Additive for 12 Bolt with Eaton Posi GM limited slip additive. __________________ Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100

10-06-2013, 08:48 AM	#4
DGulliver Registered User Join Date: Jul 2009 Location: Southern TN Posts: 227	Re: Lube and Additive for 12 Bolt with Eaton Posi x3 on the GM Limited Slip Additive. Whale oil is your 'active ingredient'. __________________ '72 Chevrolet Step Side 350/TH350, '63 C10 Step V8 '74 Trans Am 400, '80 Trans Am Indy Pace Car Mercedes AMG S55, SLK230 Kompressor, GL450 '96 Dodge Indy Ram Official Indy Truck '99 Porsche 911 Carrera

10-06-2013, 08:52 AM	#5
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,870	Re: Lube and Additive for 12 Bolt with Eaton Posi I couldn't find any "GM" LSA so I put a second bottle of Trans-X in it to see if that will help. If no good than I will ask my dealer to order a couple of bottles and a gasket so I can do another service on it. __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD

10-06-2013, 10:43 AM	#7
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,870	Re: Lube and Additive for 12 Bolt with Eaton Posi Yep, I completely understand the why but I was hoping someone had a good experience with a product available at a local auto parts store. I am going to order some of the GM additive as a back up, but I am hoping adding more of the Trans-X additive will get me through Cruising the Coast. I added Trans-X when I installed the all new rear-end at the end of February, which leads me to believe it is inferior. The problem is there is nothing else available locally. __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD

10-06-2013, 12:17 PM	#8
Katrina/10 Registered User Join Date: Oct 2010 Location: Ocean Springs, MS Posts: 1,746	Re: Lube and Additive for 12 Bolt with Eaton Posi I tried other products also, but nothing worked for me except the GM additive. Most dealerships used to keep it in stock, but I haven't bought any lately. __________________ Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100

10-06-2013, 12:30 PM	#9
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Lube and Additive for 12 Bolt with Eaton Posi i always used royal purple in my posi rears and needed no additves the stuff worked great and they were all heavily used himilage trucks not unusal to carry heavy loads to swapmeets and flea markets with 1500mile weekends the norm __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-06-2013, 04:23 PM	#10
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,870	Re: Lube and Additive for 12 Bolt with Eaton Posi I took the truck for a spin between rain showers and it was quiet out back. __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD



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