Seems to me that 53" springs are going to be too long for a truck with 52" springs.
That would over extend the shackles. With weight on the springs the shackles should be close to vertical.
I believe the 52 and 56" measurements are with weight on them.
So the 53" springs might, once there is weight on them, extend out close to 56"
just my thoughts on it
I'm sure that if you talk to whoever you got them from, they can enlighten us all
I think the 'burb tank is over 40 gallons
I was wondering if it would fit, I have heard it will. I haven't measured yet though.