1 - My '40 originally had the knee shocks but otherwise is very similiar to 47-55. 2 - Yes 3 - Axle can go up 1 1/2" and down at least 1 1/4". So 2 3/4" travel? 4 - Bump stop is on the spring. It's is fixed to the u-bolt fixture. Yes 1 1/2" at ride height and only drops 1 1/4".
