Changing Differential Fluid 2004 Chevrolet Express 3500 Roadtrek Popular 190
Channel: Stephen Rivett
Date: 2019-09-23

HOW TO, DIY DANA 70 SUPER 70S
This is a cover off fluid change on a GT4 3.73 differential which is also found in the GMC Savanna 3500 and some other model vehicles.  Should also cover the 2500 and GT5 differential with the 4.10s.  The differential cover on my van has 12-holes.  

I scooped out all of the fluid at the bottom of the differential and used about 3.8 litres of fluid which is essentially a US Gallon.  As you can see, it is very hard to get under this van and confirm the final fluid level.

Note, if you have a Roadtrek, I moved the generator back 3-1/4" prior to doing this.  You will not have this much space to work unless you do the same.  Moving the generator was easier than changing the fluid.
https://www.youtube.com/watch?v=d6ZsgJkWISI

Some affiliate links:
-Carbide Scraper Set:  Lisle 81780, https://amzn.to/3Ciz5G6
-Gear Oil RTV:  Permatex 81182, https://amzn.to/3zeUvSE
-1 Gallon of Gear Oil:  Mobil Delvac 1 75W90 ,https://amzn.to/2XCfCB6
-Small Pump (quart bottles):  https://amzn.to/3AmHWGw
-Large Pump (all other bottles):  https://amzn.to/2YVwN1f
-Drain Pan:  42003MI, https://amzn.to/2XuwzOn

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