I am considering geting a 1955 Chevy 6400 "Big Bolt" truck from my grandad that has been parked in a field the past 15 years. I am assuming that the fluids in the pumpkin of the rear axle have turned to bubble gum. I have never changed out the rear axle fluids in something this old. Is there a specific fluid that I should change it out with? Or is it the same as any other car?
