I have crane revolution seals front and rear in 14 bolt 40 spline flavor.
Just filled my diffs with gear oil and didn't even drive it and come back in the morning and there is gear oil all over the floor
I'm ordering some seals-it seals!!!!!!!!!!!!
The problem with the crane seals is that it is on the side adjusters. To even get to them to look to see what the problem is the carrier has to be removed which on front usually means removing the steering ram.
The major flaw I see with them is the pipe dope on the threads. Mine were very sloppy in the housing splines when dry fit. Then you have to pipe dope them up and screw them in and basically back them off to get carrier preload which takes your chances of a good seal to almost nothing on the one side. Mine are both leaking on one side that this was done.
Might be more beneficial to just run one seal at the diff or two right next to each other. If the inner seal fails but the outer holds up you will be running your gears dry or close to dry and won't know until they blow up.I am using 2 seals-it economy seals per side.
One close to the diff and one next to the C.