It depends on the junk yards. Remember, they only get whats turned in or go out themselves to get. So you need to ask, if you are parts scrounging.
There are several places to search for used car parts. If finding and buying parts online is not an option, there are junkyards available in many places. These junkyards often allow one to buy used parts for a discounted price, or search for anything someone wants.
Replacement parts are parts you get to replace the broken ones on your car. They are available both used (from junkyards) and new from auto parts stores.
Here's a site that sells used parts for a variety of tractor models: http://www.countrytractorparts.com/
One may buy quality used tractor parts online from several stores. Some of these stores are eBay, Worthington AG Parts, Used Tractor Parts and QTP Online.
www.worthingtonagparts.com, www.tractorpartsasap.com, and www.bootheeltractorparts.com sell used tractor parts; prices are available for comparison.
There are a number of sites where you can purchase used tractor parts online. A few of the sites where you can make such purchases are fastline.com, best-used-tractor.com, and antiquetractorstore.com. You can buy used tractor parts online at www.worthingtonagparts.com. Another good website is www.ssbtractor.com/tractor-parts.html
Used Ford tractor parts can be purchased through specialized tractor part suppliers, such as Yesterday's Tractor Co. or Tractor House. These, and many other stores, offer online inventory viewing and purchase of antique tractor parts. Alternatively, used tractor parts can often be found through online marketplaces, such as eBay.
Parts for a Ford 4000 tractor parts come in three forms. Used parts are available from Broken Tractor. Restored parts can be found through Tractor Part. Finally, specialty welders and tractor supply stores offer newly made parts that fit the 4000.
There are several online stores that sell used or refurbished tractor parts. One of these websites is powersourceonline.com.
Used tractor parts are worth upwards of hundreds of dollars depending on the parts being sold. Engines will be the most expensive parts. One can make these trades on these sites: Market Book, Worthington Parts, SSB Tractor, Yesterday's Tractors.
Used tractor parts can be found at: tractorpartsasap.com/ These can be shipped to all states at reasonable prices. Also www.bootheeltractorparts.com has used parts at up to 50% off of new parts.
Junkyards will sell just about anything they have. Junkyards take cars and trucks so as long as they have the truck you need they will sell you the part.