I just ordered 4 quarts of Red Line Manual transmission Fluid and was wondering how many quarts of fluid it really takes? Is four enough, or do I need to get a few more for my HD 6 speed? Also, how many quarts of gear oil do the front and rear diff's hold? I have 96,000 miles on my 04 DRW 3500 and bought it with 80,000 miles on it. I want to go through her bumber to bumber replacing the fluids... Thanks...