I would wrap the housing only in some shrink wrap and use packing tape to tape a shiping label to it
or take some cardboard and cut it up to wrap the housing and tape it up real good
axles I would zip tie together and wrap in shrink wrap/cardboard and tape up good also
the chunk I sent,I zip tied it in a milk create then cut cardboard to wrap the create up and shiped it ups for about 40$ for 80 lbs
a good cheap way for the housing is parcil post with the usps and add a deliv conformation on it
same for the axles with parcil post
it could take up to 2 weeks though with snail mail..but cheap
my steering colum was 14.50 this way
my traction bars came this way for less than 20 bux(right at 2 weeks for deliv)
I wraped a set of leaf spring with shrink wrap and sent them for about 40 bux ups with the label taped to it
my housing and axles came in 2 boxes from moser with very little packing...
just clean the oil out so it dont leak thru anything and it can go cheap with the usps in parcel post