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You can use any SAE certified rear differential fluid in your 1970 Chevrolet. The 1970 Chevrolet differential fluid can be checked from the differential fluid check port.
winter- 5w30 summer-10w30
I have a Yamaha 350 big bear, and differential drain plug is on the bottom of the differential. Just remove the plug and let it drain, put the plug back in and fill it back up... i use just regular gear oil
80w90
Dot 3
75W-90
you will use 300cc. This is the same as 10oz.
Synthetic 75w90
75W-90 in the rear differential. 80W-90 in the front differential (4x4 models). This is according to the 2007 Chevrolet Suburban owner's manual.
VTM-4 available from Honda only
75W140 is the recommended axle fluid.
80w90...with a diff additive for the rear