New Rear Diff cover-fluid?

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Jun 25, 2007 | 06:47 AM

ckal704

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From: Lancaster County PA

New Rear Diff cover-fluid?

Got my new aluminum rear diff cover and am ready to change fluid. A lengthy search in the oil forum and tranny forum seems to indicate 80W140 synth fluid with friction modifiers (I have LS) is the way to go.
Any brand favorites out there? I'd like to do this right the first time and not have to go back in there for another 100k!

Jun 25, 2007 | 07:22 AM

Cuda_jim

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From: MICHIGAN

Just about any synthetic oil is going to fit your needs. You will get as many opinions as there is oil makers. I prefer Royal Purple or Schaffers.

Just remeber to put extra friction modifiers in the axle even if the bottle says it comes with the modifier. Most of them don't provide enough IMO.

You could try just adding the oil w/o the modifier and see if it chatters going around corners and then add some as needed.

www.76lubricants.com
www.amsoil.com
www.castrol.com
www.kendallmotoroil.com
www.mobil1.com
www.phillips66.com
www.royalpurple.com
www.valvoline.com

Jun 25, 2007 | 08:21 AM

tjbeggs

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From: Silver Lake Dunes, MI

I use royal purple 75W140 good stuff. readily availible at many parts stores.

Jun 25, 2007 | 01:50 PM

ckal704

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Thanks fellas. I used Royal Purple in the ZF5 tranny lube change the other week.
I'll dive into this one tonight or tomorrow.

Jun 25, 2007 | 02:26 PM

Neal 97 250

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From: Johnson City, TN.

Quote:

Originally Posted by tjbeggs

I use royal purple 75W140 good stuff. readily availible at many parts stores.

I used the same as Tim on his recommendation. I had a fairly hard time finding it. I had to go to a performance import parts house to get it.

I didn't add the stuff Cuda mentioned. Should I? I don't have any chatter or wheel slippage around corners yet.

Jun 25, 2007 | 03:10 PM

tjbeggs

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From: Silver Lake Dunes, MI

Neal if you don't have any chatter or niose when turning then you don't need anymore additive added. the RP has it already in formula so it should be good to go.