2015 Sierra 1500 5.3L V8, Qs about differential fluid change

[Zhiyi Clement Fu]

Want to DIY  differential fluid change myself

 

1. GMC recommends 

rear differential fluid 75w 85 

front differential fluid 75w 90;

Can I use 75W 85 for the front differential? is it supposed to be better than 75w 90?

And I live in Canada, it can get to -45 celsius in the winter, -10 and below from Nov. to next Apr.

 

2. How much I need for the front differential fluid change? how much I need for the front?

 

Thanks guys! 

Edited May 29, 2021 by Zhiyi Clement Fu

[diyer2]

I would consider Amsoil with those temperatures. 

Amsoil web site good for capacities.

For your truck https://www.amsoil.com/lookup/auto-and-light-truck/2015/gmc-trucks/sierra-1500-pickup/5-3l-8-cyl-engine-code-c-l83-2/?volume=us-volume

 

[txab]

Use 75-90 in both and be done with it. Yes, I'd recommend Amsoil. It's great product and comes in easy to use packaging. If you PM site member Black02Silverado,  he can hook you up and make you a pretty good deal many times

 

 

[newdude]

You can put 75w90 in both, won't hurt anything.  GM went 75w85 out back for "fuel efficiency".  

[Black02Silverado]

I was out yesterday and Taptalk still isn't working.

 

Yes as stated just use 75w-90.  It will work just fine even with your extreme cold temperatures. 

 

The front differential takes 3 pints and the rear takes 4.2 or 5.1 depending on which diff you have.

 

Like stated above you can look up what your truck takes here.

[UnlimitedMatt]

On 5/29/2021 at 8:45 AM, Zhiyi Clement Fu said:

Want to DIY  differential fluid change myself

 

1. GMC recommends 

rear differential fluid 75w 85 

front differential fluid 75w 90;

Can I use 75W 85 for the front differential? is it supposed to be better than 75w 90?

And I live in Canada, it can get to -45 celsius in the winter, -10 and below from Nov. to next Apr.

 

2. How much I need for the front differential fluid change? how much I need for the front?

 

Thanks guys! 

I just did my front and rear differentials last week.  It took just under 5 quarts between the front and rear diffs.  I used the Amsoil 75w-90 product everyone recommends in this thread.