Rear Diff Fluid

[MatthewAMEL]

Anyone know what the 'new' fluid is? The original 19418501 part has been discontinued and I can't find the new part # online.

EDIT: Looks like the new part number is :ACDELCO 10-4131

TASCA and Rock Auto show it as replacing the x8501 part.

 

[ngoni]

I think this is it: Site Maintenance

92184900

Get the 10-4131.

 

[5VBW Nick]

Anyone else know for sure which one it is? Would like to get some orders for my 5V BW.

Also, what about the fluid that is in the cooler when you drain the diff? Does it just stay in the cooler and not get drained out? Wondering if you should drain & refill the diff, drive it, then drain it again to be sure you get all of the old stuff out?

 

[jbawden]

My understanding of the cooling systems on these cars is there is a small heat exchanger near the diff, but the cooling fluid is a separate and distinct system that isn't gear oil. In other words, drain and fill gets nearly all the fluid out.

 

[AC2024]

Anyone know what the 'new' fluid is? The original 19418501 part has been discontinued and I can't find the new part # online.

EDIT: Looks like the new part number is :ACDELCO 10-4131

TASCA and Rock Auto show it as replacing the x8501 part.

Correct. Just the GM part is discontinued, the AC Delco part 10-4131 remains (its not new , its been the AC Delco part number for a while)

 

[AC2024]

My understanding of the cooling systems on these cars is there is a small heat exchanger near the diff, but the cooling fluid is a separate and distinct system that isn't gear oil. In other words, drain and fill gets nearly all the fluid out.

Correct. The fluid in question is just the gear which is totally separate as you mention.

 

[5VBW Nick]

Thank you for the responses, very helpful!

 

[5VBW Nick]

$93 shipped from Tasca Parts for 2 quarts

 

[rdollie]

$93 shipped from Tasca Parts for 2 quarts

$93.20 for 2 shipped via RockAuto before their 5% discount code if you have one.

 

[mfcentex]

Is there any washer or thread sealant needed for these plugs? From searching, I see that the torque spec is 50Nm.

I purchased a 14mm hex socket for my truck's rear diff years ago. I believe it will work on this diff.

 

[rdollie]

Is there any washer or thread sealant needed for these plugs? From searching, I see that the torque spec is 50Nm.

I purchased a 14mm hex socket for my truck's rear diff years ago. I believe it will work on this diff.

I don't recall a washer and know there's no sealant required. (I'm doing mine again this weekend so I'll check on the washer).

 

[rubberduck]

It’s a plug, 14mm hex, no washer, no sealant needed.

 

[DonD]

I had the dealer replace the differential fluid at 1000 miles. Don

 

[mfcentex]

OEM fluids are pricey these days. I ordered fluids from Rockauto for the 4BW rear diff and my truck's transfer case. It was $190 for 4 quarts (2 each). The Mopar fluid was more expensive.