That looks like the rear end from an AMT Ford LN series kit. I don't ever remember seeing one chrome plated? (I have built every version of that kit) personally, I would strip it as you would more than likely never see a chrome plated rear axle that is that big in real life!
I bought two of them from Tower hobbies along with two of the MPC rescue blazer kits. Shipping was free and when you use the promo code 01A15 you get $15 off of any order over $50. So each kit was only right at $16