Spec for rear differential oil on 2004 GMC sierra 1500

[Jan Mermon]

 

How much gear oil is required for rear differential

[Black02Silverado]

Depending on your ring gear size it takes a different amount of fluid.  You can find the information on the AMSOIL look-up guide.

 

Notes: (1) Use synthetic axle lubricant P/N 88900401 which replaces previously recommended synthetic lubricant P/N 12378261 meeting GM Specification 9986115.
Capacities: 8.60 RG Rear 4.2 pints

 

Notes: (1) Use synthetic axle lubricant P/N 88900401 which replaces previously recommended synthetic lubricant P/N 12378261 meeting GM Specification 9986115.
Capacities: 9.50 RG Rear 5.5 pints

 

Notes: (1) Use synthetic axle lubricant P/N 88900401 which replaces previously recommended synthetic lubricant P/N 12378261 meeting GM Specification 9986115.
Capacities: 9.75 RG Rear 5.9 pints

 

So as you can see it goes from 4.2 pints to 5.9 pints.  So if you got 3qts it would be enough to cover which ever one you have. 

 

 

[Jsdirt]

Nick stole my thunder, lol.   That's exactly where I was going for the info.

[newdude]

Also, no limited slip additive to be used on GM rear axles in the pickups.  

[Brooks Wright]

What type of rear-end fluid for 04 gmc sierra  1500 truck

[txab]

Just like the 2nd post. 75w-90. Most on here use Amsoil Severe Gear for the diffs. You can contact Black02Silverado and he can fix you up. Or pick something off the shelf. You'll need 3 qts to do it. 2 will leave a little shy. This whole thread has good info in it

[Black02Silverado]

Plus, these Easy Packs make changing the fluid a nice clean process.

 

[customboss]

I'm crippled and did my own front diff and transfer case on the trail boss, had dealer do full trans fluid exchange with BG machine and rear diff. The squeeze packs are great. With a clean fuel hose mod I can get about anywhere except the trans fill plug. 

 

On Nick he ought to be in the Amsoil Hall of Fame because deals straight and gives the customer the benefit of the doubt in all my dealings with him over the years. 

 

Finally from an old school R&D  oil analysis and formulating point of view its hard to beat Amsoil driveline lubes today.  I am not totally sure but the gear lubes are so crystal clear and using very little traditional additives that they must be advanced oil soluble PAG base oils.  Visually and studying their SDS and PI sheets. 

 

After changing out all the driveline lubes and on marginally decent Mobil1 5w30 in engine I am seeing about a 4.4% increase in MPG so far.  This in mountain off road driving, on road TBD since I am staying put lately except for VA visits.