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2014 Silverado differential change #4808474
07/08/18 02:55 PM
07/08/18 02:55 PM
Joined: May 2007
Posts: 939
04SE Offline OP
04SE  Offline OP
Joined: May 2007
Posts: 939
I changed the front and rear differential fluid in my truck today. The truck has 48,000 miles and the rear fluid came out a dark golden brown and it smelled of grapes and diff lube, quite the combination of smells. The magnet in the bottom of the differential housing had more goop/fuzz than I expected but nothing big enough to actually see with the naked eye. I re-siliconed the magnet in place and let it dry as well. I cleaned/scrubbed the cover in our parts washer and flushed out the housing with brake clean. GM was nice enough to use a reusable gasket.

The front was easy as GM was nice enough to put a drain and fill plug. The fluid that drained out was thick and almost gray. I am guessing they didn't put a synthetic up front.

I refilled both with Mobil 1 75w90. I figure they are easily good for another 50k. I very rarely tow and most miles are commuting or vacation.

Life's little problems can be solved with a shovel and silence.
Re: 2014 Silverado differential change [Re: 04SE] #4808485
07/08/18 03:25 PM
07/08/18 03:25 PM
Joined: Dec 2017
Posts: 2,966
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,966
SE British Columbia, Canada
Yes, GM often specs conventional fluid for the front diff as they expect it won't be used as much as the back diff; trying to save you 10 bucks. I've seen that severe service sometimes specs synthetic. I have synthetic in the front and rear diff as you have done. Good job!

If you want the job done it yourself.
Re: 2014 Silverado differential change [Re: 04SE] #4808727
07/08/18 09:44 PM
07/08/18 09:44 PM
Joined: Jan 2013
Posts: 493
Washington, DC
CapitalTruck Offline
CapitalTruck  Offline
Joined: Jan 2013
Posts: 493
Washington, DC
I put 75w90 synthetic up front is mine as well as there is a TSB that advises to use it for really cold weather.

2013 Silverado 4.8L VVT 4x4 97k mi - ACDelco Dexos Full Synthetic 5w30 (ExxonMobil variant), ACDelco PF48E

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