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03' 2500 HD Gear lube???


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Rear diff gasket was leaking so I pulled the cover and did the gasket. I had a bunch of new Lucas 85W-140 kicking around the shop so that's what I put in the rear (14 bolt 10.5"). Is this to thick or will it be safe?? I don't want to junk a rear over $30 worth of gear lube.

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Gm doesn't run friction modifier to my knowledge.

 

 

Really? I thought that was only if you have an Eaton G80 locker. And that it was still required for the limited slip posi units. Must be getting my 1500/2500 and year models mixed up.

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No friction modifier required on my 2012. My 2001 did require it.

So does my 2000.

 

Be nice to know what year/s and diferentials GM changed to that don't require it.

 

Back in my hot rod days runnin posi's & limied slips we never add anything. Chadder? What chadder? The motor shook the car so hard we wouldn't have felt it anyway. Lol.

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