Weight of 7 1/4 vs 8 1/4 vs 8 3/4 vs Dana 60?

I just replaced my 7 /14 with an 8 1/4. The 7 1/4 is an easy two-man lift, but the 8 1/4 is much heavier. If I had to guess I'd say the 7 1/4 weighs about 120 lbs and the 8 1/4 weighs maybe 180? But I'm no weight-guesser.