2 quarts sound right for the rear end diff. But I always get 7 quarts of tranny fluid when changing fluid and filter. Then if that doesnt quite fill it up it is still enough to be able to get to the parts store for more. When first filling the tranny back up pour in 5 quarts, crank the engine and slowly go through all the gears then back to park, making sure it drops into every gear before changing. When back up to park then check the fluid and add accordingly.