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?

Re: Lube and Additive for 12 Bolt with Eaton Posi
 

GM limited slip additive.

Re: Lube and Additive for 12 Bolt with Eaton Posi
 

x2

Re: Lube and Additive for 12 Bolt with Eaton Posi
 

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

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.

Re: Lube and Additive for 12 Bolt with Eaton Posi
 

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.

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.

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.

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

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. :)