Kinda tech: Seized or suspected seized bolts - best to use an impact to shock them loose or by hand with a breaker bar? I've had mixed results both ways with shearing the bolts. Seems like the impact gets them loose more often than the breaker bar, which tends to shear.
I'm going to be pulling the trans crossmember out of the ZJ next week to do the t'case swap, and I'd like to avoid broken bolts. I have been soaking them with WD-40 (ran out of Kroil :doh

daily for a couple days now as much as I can; the weldnuts are inside the frame rail so it's hard to get to the threads.
While we're talking tech, when swapping yokes on a D30 is it necessary to get a new crush sleeve or can I get away with reusing the one in it as long as it's torqued properly?