Rear axle posi // 4.10 Dually

So the other day I tried to drive the truck onto some plastic ramps. One wheel spinning and the other one taking a rest. I finally got it up with one wheel spin and while it was up, I pulled the tires, checked the brakes, unstuck the one side inner wheel and pulled the diff cover. Noticed a chipped tooth on one spider and the clutch pack was on both sides and "looked" good.
Good Ford.
I changed the fluid that was not all that dirty, nor did I find the broken tooth in the bottom.
Would you replace the diff with a different design or rebuild the ford unit?
I figure the parts cost of rebuilding the Ford is 1/3 the cost of a different unit.
The different unit being possible better quality.
Locker? Or what?
Eventually this truck will wind up 4WD as I already have the trans and front axle.

I think we had a discussion about this.
Iirc, the consensus was to replace with a locker, or a like a Detroit true track.
Though, some do just rebuild the lsd.

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Thank you for the response. I figured I was late to this party. My thinking is that the stock rear end should ave lasted a bit longer than 125K. Oh well. Rebuilding it is about $225,
and now to research the Detroit True track. . .Summit racing say's $655.
I guess the stock option for this primarily on road, non-daily driver is where I am going.
I have already sunk enough money into this and am currently planning on sinking more before this rear end problem arose. Maybe the next time around will be the True Track.

I recently found an axle for my pickup with the gears I needed and lo and behold, it came with a Detroit Locker in it! I would highly recommend one if you tow in the rain or have a lot of hills or 4x4 whatever. On my rig I haven't found it to be very noisy at all. You do have to watch out in the snow or wet while braking if one wheel locks up the other will too, sending the rear end sideways.

That said if you buy new just go with the True Track, has similar performance on the street with no noise and won't push your steering around like the locker. On my long wheelbase it's not too bad but this thing on a bronco would just about drive me nuts. When it locks up it tries to keep the vehicle dead straight but then when it unlocks your over-correcting and the steering jumps a little. Short wheelbase would jump a lot. The true track has an excellent rep and eliminates most of those issues.

@Thewespaul has said more than once that he gets good performance out of the Ford LSD setup so maybe he has some tricks for you. Or others of course.

When rebuilding a posi-traction unit for my GTO years ago, I found that the (experienced, as in: old) parts guys seem to know which parts are suspect and need to be replaced. They can be very helpful in setting up a reliable stock system. Go to a dealer that has been in business for a long time, they will have the parts in stock.