If you are lucky you might be able to find a NP540 od. Harder to find than NP540 direct but they are out there, some will spline right up to your clutch. OD units have 3rd to far right & up where direct drive have a normal shift pattern of 3 center & up, 5th far right & up.
No spin takes some getting use to as the inside tire will drive the rig, outside tire will overrun until traction is lost.
If you lay the hammer down coming out of a curve it may tend to want to go straight. They were used in school buses when I was young so they can't be that bad!
I have put that style in my 2000 K2500 10.5" axle & love it.
