Will a carrier from a wrangler sport 2012 dana 30 fit into my 91 cherokee dana 30 . I can't find anything telling me if it's a hp or lp . Mine is a hp

It will fit yes. Make sure you dont try to swap internals though, they are different internally. Also the JK carrier might have 7/16 bolt holes in it rather than 3/8. Its a crap shoot.

If the holes are larger they do sell small sleeves to use the carrier with the small bolts.

Max