2014 Silverado Diff Fluid Change

[Oli20]

Hello,

I need some advice, I have a 2014 Silverado with the G80 3.42 differential. I have about 20k miles on it and would like to change the front and rear diff. The front calls for 80w-90 non synthetic and the rear calls for 75W-85 synthetic. After much reading it sounds like I can use a synthetic in the front, should I stick with 80w-90 or just go to 75w-90 as I park outside all winter. Also, as far as the back I can't find many options for 75w-85, is it safe to use 75w-90? They recommended 75w-90 in 2013, I know that 2014 had a lot of changes but I can't find anything that says the differential changed to indicate it needs 75w-85. My understanding is that it's a CAFE thing. Anybody have info on that?

Thank you in advance for the help.

Ryan

 

[Dyusik]

75w90 for both and call it a day. Come back in anothe 50 to 80k for a follow-up.

 

[CHARLIEBRONSON21]

Originally Posted By: Dyusik
75w90 for both and call it a day. Come back in anothe 50 to 80k for a follow-up.

Agreed. Call a fluid support line for any major company and they'll tell you 75W90 is acceptable for use.

 

[WillB]

Before you drain your diffs, check the level in them. Chances are they wont be full, so when you refill them make sure you put them back to the same level.

 

[CarbonSteel]

I would use 75W-90 for both and I would use Amsoil.

 

[stchman]

Use either Mobil 1 LS 75W-90 or Amsoil Severe Gear 75W-90 in both the front and rear differentials. Should be good for 100K unless the fluid gets contaminated.

 

[Rat407]

Differential, Front 8.25 RG......SLF [2]
All TEMPS......
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
Differential, Rear 8.6 RG......GL-5
All TEMPS......75W-85 [3]
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
Differential, Rear 9.5 RG......GL-5
All TEMPS......75W-85 [3]
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
[2] Synthetic Axle Lubricant 75W-90, GM P/N 88900401 or
equivalent meeting GM Specificartion 9986115.
[3] Synthetic axle lubricant GM P/N 19300457.
Differential, 8.25 RingGear Front..........3 pints
Differential, 8.6 RingGear Rear..........4.2 pints
Differential, 9.5 RingGear Rear..........5.5 pints