When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
They are really only practical to sell locally, shipping is costly. It all depends on the local market. If you are patient they will sell, but probably only for $100 for the trans, maybe $250 for the engine. I doubt anyone wants the rear axle (must be a bigger truck?)
The differential you'll be luck if you can give it away. I have a Dana 44 with 4:27 gears that I can't get rid of even for free along with an 85 305 SBC for free! Man times certainly are tough! The price on anything is usually what the market will bear and these days it won't bear much!