Originally Posted by tuff2010
????Elaborate....There are literally an uncountalbe number of Locked D30's under jeeps without issues...
I'm not sure I buy that. Last time my club was out one of the rigs blew a D30. The spider gear apart and punched two holes in the pumpkin that looked like bullet holes.
Lockers can put a lot of stress of stress on the spider gear.
When climbing, which is IME the most common time for locking, most of the weight and most of the work is done by the rear diff. If you go out with a rig that has selectable lockers, very little time is spent with the front diff locked. Very difficult to steer fully locked.
If you were to go out with a rig with rear locked in 2 low, it has an easier time than rigs in 4 low with open diffs.
If your going downhill, that's when the front does most of the work but with gravity working in your favor you don't usually need to lock.
The D30 is not a bad diff and axle, but it is a weak point, and as such most likely to break. If you were to add up the costs to strengthen the axle, to add C gussets, sleeves, lockers, shafts; you can buy a Rubi D44 axle, and can almost buy a Prorock D44 axle.
So I would put lockers in my rear D44 and not front D30, because over the life of my rig it is more cost efficient to replace it with a D44 axle, and have a stronger vehicle. I am not sinking any money in my D30; I am saving it all for a new axle.
And any axle can blow. Like I said the last time I was out I saw a D30 blow, but the time before that I saw two front D60s blow doing some crazy hard stuff.