The 14FF is the easiest axle to set up.
If you are staying the same ratio, then it is even easier.
What I would do is get the open carrier.
mark the adjuster rings and housing.
Check to see what the backlash is. this can vary alot from diff to diff. Mine was at .018, which is alot IMOHO. but the patteren had been estableshed and I put it back to the same.
Back off the rings 2 turns and pull the carrier.
swap the ring gear to the open carrier.
Install the carrier and put the rings back to where they were.
swab on the marking compound and see what it looks like.
On a FF the pinion depth is easily changed by adding or removing shims from the pinion housing.
Adjust the backlash by moving the rings.
If you do have to reset the back lash getting the carrier pre load is kinda tricky but easy to do.
If it is too tight bye bye bearings.
IF after reseting the back lash to where it was in the begining, pull the pinion housing out and spin the carrier.
With a good pull on it it should spin about 8 - 10 seconds.
Personaly a locked front diff is just begging for trouble.
Lock the rear and wheel the crap out of it.
With 33's and my set up, I welded my spiders. I go just about any where I point the front at.
My biggest problem is that big pig in the rear and only 8 3/4 of clearance. But I am gonna shave it as soon as I get the d-ring made. I am just gonna use a sawz all and grind the erst.
If you are gonna shave it get a rock ring or make a d-ring.
The one I am in the process of making is 1" x 1/4".
Even with that big ol lip on it the rocks and stuff have almost peeled the cover off.
I have a bunch of other stuff in the fire at the moment so it will be a bit before I can whip one out.
But I plan on a write up on it so stand by for pics.
Check this out for shavin that pig.