I will trade you a set of snap-on impacts 1/2" and 3/8" they are valued way higher than the $400 you want. I paid over $400 just for the 1/2" one and over $300 for the 3/8". The only thing is I live in Utah so you will have to ship it. I have shipped a number of diffs and found that the cheapest way is in a bucket and ship threw ups, its only like $30.
Thanks for the offer but I don't work on vehicles as a profession, I keep your commercial buildings cool and your ice cream frozen.
My Crafstman tools work just fine for weekend wrenching.
Thanks though!