HAR also offers Rebuilt Duramax engines that make use of the good parts of your existing engine. These high quality rebuilds are updated and perform better than new. Each engine is assembled with the upper and lower oil pans, front damper, flywheel, front cover and seal, rear engine plate and main seal making them ready to add your accessories and install. Most rebuilds are an in stock item and can be shipped next day. Call HAR for the many different available options.